Journal of Aquatropica Asia (JoAA) is an open access scientific periodical managed by the Department of Aquaculture, Bangka Belitung University. JoAA Journal involvement is carried out 2 (two) times a year, namely in July and December in the form of the main manuscript is an article that contains the results of research (research articles). Other manuscript contributions can be in the form of short articles (short communication), articles review, and also special issues. Articles received will be reviewed by reviewers managed by the Editor in Chief before the manuscript is accepted and approved for publication in JoAA. The Journal of Aquatropica Asia (JoAA) accepts articles written in Indonesian or English with regard to aquaculture studies and aquatic ecology in the broadest sense covering aspects of reproduction, nutrition and feed, genetics, physiology, morphology, health of aquatic organisms, water quality, plankton, conservation, and other aspects relevant to the field of aquaculture, include economic social, fishery products processing, and aquatic resources management.
Program Studi Akuakultur, Universitas Bangka Belitung
STRUKTUR KOMUNITAS DAN NILAI KONSERVASI IKHTIOFAUNA DI EKOSISTEM PERAIRAN BUMANG, PULAU BANGKA
This study aims to identify the community structure, conservation value, and habitat suitability of the ichthyofauna in the aquatic ecosystem of the Bumang River, Bangka Island. Exploration was conducted in June–August 2025 using a descriptive exploratory method through fishing with traps, gillnets, and scoop nets at three observation stations. The identification results showed that there were 41 fish species, one shrimp species, one freshwater crab species, and one snail species. Three of them are endemic species of Bangka Island, namely Betta chloropharynx, Parosphromenus bintan, and Betta schalleri. The diversity index (H’) value in the Bumang River ranged from 1.243–2.578 which indicates a moderate category, the evenness index (E) between 0.334–0.694, and the dominance index (C) between 0.114–0.403 which indicates the absence of dominant species. Water quality parameters indicate a temperature of 25–28°C, pH 5–6, and DO 3.7–6.5 mg/L, which are still suitable for freshwater fish life. The presence of several endemic and endangered species such as Betta schalleri (EN), Betta chloropharynx (CR), and Parosphromenus bintan (VU) demonstrates the importance of the Bumang River as an inland water conservation area with high ecological value. The results of this study are expected to become the basis for the sustainable management and protection of aquatic biodiversity on Bangka Island.
Kata Kunci: keanekaragaman ikan, konservasi, habitat perairan, ikhtiofauna, Sungai Bumang
Copyright (c) 2025 Journal of Aquatropica Asia
KARAKTERISASI LIPID HASIL KULTIVASI MASSAL Spirulina sp. DALAM MEDIA LIMBAH BUDIDAYA UDANG VANAME (Litopenaeus vannamei)
Microalgae is one of the microorganisms that has the potential as raw material in the development of research and technology to produce vegetable oil. Microalgae Spirulina sp. is a microalgae that has the potential to be used as a raw material for biodiesel, which has a fairly high lipid content when compared to other microalgae. However, to produce enough Spirulina sp. biomass, it is necessary to optimize the culture media. One of the organic materials that can be used as Spirulina sp. culture media is vaname shrimp farming waste (Litopenaeus vannamei). This study aims to utilize vaname shrimp farming waste to minimize costs in mass-scale microalgae cultivation for daily lipid evaluation and biodiesel production. The method used in this study was laboratory experimental method, where observation and primary data collection were conducted on a mass scale. Based on the research results, the highest daily cultivation dry biomass of Spirulina sp. was found on day 4 (four) with a value of 2.29gr/L with a biomass percentage of 7.24%. The highest lipid extracted using soxhlet was on day 4 (four) with a lipid percentage value of 3.73% with a lipid percentage of 0.84% and the highest lipid productivity was also found on day 4 (four) with a value of 0.0854 gr/L. Mass cultivation biomass of Spirulina sp. obtained wet biomass of 13,760 g and dry biomass of 3,220 g. Lipid yield of Spirulina sp. in mass cultivation obtained a weight value of 163.74 g with a percentage of 5.09%. Biodiesel yield of Spirulina sp. in mass cultivation amounted to 101.225 g with a percentage of 61.82%. The quality of Spirulina sp. biodiesel consisted of 4 highest chemical compounds, namely Heptadecane (CAS) n-Heptadecane 41.35%, Hexadecanoid acid, methyl ester 13.03%, Isoppropyl Linoleate 8.91%, and 9,12-Octadecanoid acid (Z,Z)-, methyl ester 6.88%.
VARIASI DOSIS MOL (MIKROORGANISME LOKAL) HASIL FERMENTASI LIMBAH SAYUR UNTUK PENGAYAAN MEDIA KULTUR Daphnia magna
MOL (Local Microorganisms) is a solution resulting from fermentation from the decay of organic materials, the solution is useful to helping the process of decomposition of organic materials. MOL has the potential to be a bioactivator in fermentation. This study aims to analyze the abundance of Daphnia magna populations cultured on media with the addition of MOL with different doses. The research was carried out at the Fish Nutrition Laboratory, Faculty of Fisheries and Marine Sciences, Lambung Mangkurat University, Banjarbaru City, South Kalimantan Province. The MOL used comes from fermented vegetable waste of cabbage, cauliflower leaves and mustard greens that are fermented for 14 days. This study used a Complete Random Design (CRD) of 4 treatments and 3 replicates with a MOL dose of 0 mL/L (K), 0.5 mL/L (A), 1 mL/L (B), and 1.5 mL/L (C). The parameters observed were population abundance, population growth rate, maximum population growth of Daphnia magna, and water quality. The study showed the best results in Treatment C, namely an abundance of 2453.33±68.06 ind/L, a growth rate of 51.44±0.134% and the maximum growth of the Daphnia magna population occurred on day 8. The results of the analysis of nutrient quality from MOL and the quality of culture media water are very supportive in the growth of Daphnia magna. The application of MOL of vegetable waste fermented from cabbage, cauliflower leaves and mustard greens waste as much as 1.5 mL/L in culture media can be considered in the enrichment of culture media for the growth of Daphnia magna.
KARAKTERISASI JENIS MAKANAN IKAN TANAH Barbodes binotatus (Valenciennes, 1842) ASAL PERAIRAN PULAU BANGKA PADA HABITAT SUNGAI DAN KOLONG BEKAS TAMBANG
Barbodes binotatus (Valenciennes, 1842) atau dikenal sebagai ikan tanah merupakan spesies ikan air tawar yang memiliki nilai ekologis dan ekonomi, baik sebagai ikan konsumsi maupun ikan hias. Populasinya tersebar luas di perairan Asia Tenggara, termasuk Pulau Bangka. Namun, aktivitas penambangan timah yang masif di Bangka berpotensi mengganggu habitat dan sumber pakan alami spesies ini. Penelitian ini bertujuan untuk mengkaji jenis makanan utama pada saluran pencernaan ikan tanah, menentukan tipe makanannya, serta mengevaluasi kondisi kualitas air pada habitat alami ikan tanah, yaitu di sungai dan kolong. Lokasi pengambilan sampel dilakukan di Sungai Kayu Besi (Kabupaten Bangka) dan kolong di Desa Terap (Kabupaten Bangka Selatan). Metode penelitian yang digunakan adalah metode survei dengan teknik pengambilan sampel secara purposive sampling. Hasil penelitian menunjukkan bahwa jenis fitoplankton yang ditemukan di perairan sungai berasal dari kelas Bacillariophyceae, Cyanophyceae, dan Euglenophyceae, sedangkan zooplankton tidak ditemukan di habitat sungai tersebut. Sementara itu, perairan kolong mengandung fitoplankton dari kelas Bacillariophyceae, Chlorophyceae, dan Cyanophyceae, serta zooplankton yang termasuk dalam kelas Branchiopoda, Crustacea, Maxillopoda, dan Ostracoda. Berdasarkan analisis isi saluran pencernaan, fitoplankton merupakan makanan utama ikan tanah di kedua habitat, dengan nilai Index of Preponderance (IP) berkisar antara 76–100%. Makanan tambahan berupa cacing ditemukan dengan kisaran nilai IP antara 0,17–20%, sedangkan zooplankton berperan sebagai makanan pelengkap dengan kisaran IP antara 0,03–0,6%. Berdasarkan panjang usus relatif yang berada pada rentang 1,44–1,64 cm, ikan tanah diklasifikasikan sebagai hewan omnivora.
Perairan pulau Bangka, kolong, jenis dan tipe makanan, ikan tanah, sungai
ANALISIS EXTRACELLULER PRODUCT Vibrio harveyi BERBASIS NANO-KITOSAN YANG DIPERKAYA EKSTRAK Caulerpa lentillifera SEBAGAI VAKSIN ORAL UNTUK KERAPU CANTANG TERHADAP INFEKSI Vibrio harveyi
Vibriosis merupakan penyakit penting yang menyebabkan tingginya tingkat kematian pada ikan kerapu cantang (Epinephelus fuscoguttatus x Epinephelus lanceolatus), yang sebagian besar disebabkan oleh infeksi Vibrio harveyi. Penelitian ini bertujuan untuk mengevaluasi efektivitas vaksin oral yang mengandung produk ekstraseluler (extracellular product, ECP) dari Vibrio harveyi, nano-kitosan, dan ekstrak Caulerpa lentillifera dalam meningkatkan ketahanan terhadap vibriosis pada ikan kerapu cantang. Rancangan percobaan mencakup pemeliharaan ikan Epinephelus spp. berukuran 10–12 cm selama 30 hari dengan lima perlakuan, yaitu: (A) infeksi Vibrio harveyi (kontrol), (B) ekstrak Caulerpa lentillifera, (C) ECP + nano-kitosan, dan (D) ECP + nano-kitosan + ekstrak Caulerpa lentillifera. Indikator utama yang dievaluasi meliputi tingkat kelangsungan hidup (%), relative percent survival (RPS, %), dan performa pertumbuhan. Hasil penelitian menunjukkan bahwa kombinasi nano-kitosan dan ECP dari Vibrio harveyi yang diperkaya dengan ekstrak Caulerpa lentillifera memberikan respons pertumbuhan yang secara signifikan lebih tinggi dibandingkan perlakuan lainnya. Komposisi tersebut juga secara signifikan meningkatkan tingkat kelangsungan hidup ikan kerapu yang terinfeksi Vibrio harveyi. Temuan ini menunjukkan potensi vaksin oral berbasis nano-kitosan, ECP, dan ekstrak Caulerpa lentillifera sebagai pendekatan pencegahan yang menjanjikan terhadap infeksi Vibrio harveyi dalam akuakultur, sehingga diperlukan penelitian lebih lanjut untuk pengembangan aplikasi komersialnya.
Renanda Renanda Baghaz Dzulhamdhani Surya Putra
PENINGKATAN BIOMASSA NANNOCHLOROPSIS OCULATA MELALUI OPTIMASI KULTUR PADA SKALA LABORATORIUM DAN SKALA MENENGAH
Nannochloropsis oculata, a versatile microalga, holds immense potential in the field of marine biotechnology. Its benefits are far-reaching, particularly in sectors like aquaculture. To fully exploit this potential, effective strategies for increasing its biomass are essential. This study aims to determine the technique of laboratory-scale Nannochloropsis Oculata phytoplankton culture, as well as the phases of its growth and development. The culture process, spanning from 200 ml to 40 L, was Meticulously observed and documented. Daily observations were made from the first day of culture until the research was completed, using a haemacytometer on a binocular microscope with a magnification of 400. The observation results of Nannochloropsis oculata growth showed varying dynamics from the first to the fifth day. Overall, no significant growth was observed; however, fluctuations were noted in each phase of the growth period during the study. In 200 ml and 1 L volume cultures, Nannochloropsis oculata showed a short lag phase (1-2 days) followed by a significant increase in biomass up to 11 million cells/ml in the exponential phase (days 3 to 5). Controlled and stable conditions at small volumes favored cell adaptation and optimal replication. In contrast, the 15 L volume culture showed a more extended lag phase, indicating sensitivity to environmental changes. The most significant anomaly occurred in the 40 L culture, where a drastic decrease in biomass occurred after the second to third day, signaling culture failure. Microscopic analysis confirmed protozoan contamination as the etiological agent, which was assumed to originate from the surrounding environment due to exposure to the culture medium.
A STUDI KOMPARASI BIOAKUMULASI LOGAM BERAT TIMBAL (Pb) PADA TAMBAK TRADISIONAL IKAN BANDENG (Chanos chanos) DI PANTURA JAWA TIMUR: GRESIK, SIDOARJO, DAN PASURUAN
Abstrak Ikan bandeng (Chanos chanos) merupakan potensi perikanan payau. budidaya ikan bandeng di Jawa Timur masih menggunakan sistem tradisional, dimana air baku tambak menggunakan aliran air sungai setempat dan pasang surut air laut. Budidaya ikan bandeng secara tradisional memiliki kelemahan yaitu sulit menjaga kualitas air sehingga mudah tercemar oleh limbah rumah tangga maupun limbah industri. Bioakumulasi logam berat merupakan proses peningkatan konsentrasi suatu zat yang masuk kedalam tubuh mahkluk hidup. Salah satu logam berat yang dapat mencemari perairan yaitu logam timbal (Pb). Penelitian ini bertujuan untuk mengetahui konsentrasi limbah timbal (Pb) yang terkandung pada air, sedimen, dan daging ikan bandeng di tambak tradisional Desa Watuagung (Gresik), Desa Kalanganyar (Sidoarjo), dan Desa Jarangan (Pasuruan). Selain itu, untuk mengetahui tingkat pencemaran Pb di Desa Watuagung (Gresik), Desa Kalanganyar (Sidoarjo), dan Desa Jarangan (Pasuruan). Metode penelitian ini dengan mengambil data secara acak (purposive random sampling). Dengan pengambilan sampel di tiga lokasi yang berbeda, setiap lokasi terdapat tiga stasiun yang diuji. Hasil dari penelitian ini, kandungan logam Pb pada air dan daging ikan bandeng tidak terdeteksi, pada sedimen terjadi akumulasi logam Pb namun kadarnya masih dibawah baku mutu dan masih layak untuk kegiatan budidaya ikan bandeng. Tingkat pencemaran logam Pb pada ketiga lokasi tambak (Gresik), (Sidoarjo), dan (Pasuruan) masih tergolong aman. Nilai indeks pencemaran Igeo, CF, dan BCF masih dibawah ambang batas dan masih tergolong aman. Kata Kunci: Ikan Bandeng, Logam Berat, Timbal, Bioakumulasi Abstract Milkfish (Chanos chanos) is a potential brackish water fishery. milkfish cultivation in East Java still uses a traditional system, where the raw water of the pond uses local river water flow and sea tides. Traditional milkfish cultivation has the disadvantage that it is difficult to maintain water quality so that it is easily contaminated by household waste and industrial waste. Bioaccumulation of heavy metals is the process of increasing the concentration of a substance that enters the body of a living creature. One of the heavy metals that can pollute waters is lead. This study aims to determine the concentration of lead (Pb) waste contained in water, sediment, and milkfish meat in traditional ponds in Watuagung Village (Gresik), Kalanganyar Village (Sidoarjo), and Jarangan Village (Pasuruan). In addition, to determine the level of Pb pollution in Watuagung Village (Gresik), Kalanganyar Village (Sidoarjo), and Jarangan Village (Pasuruan). This research method is by purposive random sampling. By taking samples at three different locations, each location has three stations that are tested. The results of this study, the Pb metal content in water and milkfish meat was not detected, in the sediment there was an accumulation of Pb metal but the levels were still below the quality standards and were still suitable for milkfish cultivation activities. The level of Pb metal pollution in the three pond locations (Gresik), (Sidoarjo), and (Pasuruan) was still relatively safe. The pollution index Igeo, CF, and BCF were still below the quality standards and were still safe. Keywords: Milkfish, Heavy Metal, Lead, Bioaccumulation
PENGARUH SUHU TERHADAP KELANGSUNGAN HIDUP, PERTUMBUHAN DAN TINGKAT KONSUMSI OKSIGEN IKAN SELUANG (Brevibora dorsiocellata) DI WADAH BUDIDAYA PADA TAHAP AWAL DOMESTIKASI
Salah satu jenis ikan seluang yang banyak ditemukan di perairan Bangka Belitung yaitu Brevibora dorsiocellata. Ikan ini berpotensi untuk dikembangkan sebagai ikan salah satu ikan hias lokal. Budidaya ikan Seluang (B. dorsiocellata) saat ini masih belum banyak dilakukan dikarenakan terbatasnya informasi dalam kegiatan domestikasi. Penelitian ini bertujuan mengevaluasi dan menentukan kisaran suhu optimum untuk kelangsungan hidup, pertumbuhan dan tingkat konsumsi oksigen ikan Seluang (B. dorsiocellata) yang dipelihara pada suhu yang berbeda di wadah budidaya pada tahap awal domestikasi. Penelitian dilaksanakan pada bulan Februari sampai dengan Maret 2021 berlokasi di Laboratorium Akuakultur, di Universitas Bangka Belitung. Metode penelitian yang digunakan yaitu metode eksperimental dengan 4 perbedaan suhu yaitu Kontrol (suhu ruang), suhu 27oC, 29oC dan 31oC. Parameter yang diamati pada penelitian ini yaitu kelangsungan hidup ikan, laju pertumbuhan spesifik, laju pertumbuhan mutlak, efisiensi pakan, tingkat konsumsi oksigen dan kualitas air selain suhu sebagai data pendukung. Hasil penelitian menunjukkan bahwa suhu berpengaruh berpengaruh terhadap pertumbuhan panjang mutlak ikan seluang selama pemeliharaan namun tidak berpengaruh nyata terhadap laju pertumbuhan spesifik, panjang bobot mutlak dan efisiensi pakan. Suhu 31oC memberikan pengaruh nyata terhadap pertumbuhan panjang mutlak sebesar 0,31±0,04 cm dibandingkan P1 (Kontrol), P2 (27oC), P3 (29oC) dengan nilai laju pertumbuhan spesifik 0,57±0,26% dan efisiensi pakan sebesar 2,77±1,17%. Suhu 27oC merupakan perlakuan dengan tingkat konsumsi oksigen terendah yakni sebesar 0,05 mg O2/menit. Sedangkan suhu 31oC merupakan perlakuan dengan tingkat konsumsi oksigen tertinggi sebesar 0,081 mg O2/menit. Berdasarkan hal tersebut, dapat disimpulkan bahwa kisaran suhu pemeliharaan untuk kelangsungan hidup dan pertumbuhan pada ikan Seluang (B. dorsiocellata) yaitu pada suhu 27-29oC dengan tingkat konsumsi oksigen yang normal.
Copyright (c) 2023 Journal of Aquatropica Asia
RESPON ORGANOLEPTIK CUMI-CUMI (Loligo sp) YANG DIRENDAM DENGAN MENTIMUN (Cucumis sativus) PADA DURASI DAN KONSENTRASI BERBEDA
Squid (Loligo sp) is one of the most essential fishery commodities and ranks third after fish and shrimp in commercial fisheries. The freshness of the squid is a very important factor and is closely related to its economic value. One of the actors in the marine commodity storage business at Rebo Beach, Bangka Regency uses Cucumbers to maintain the quality of Squid. Until now there has been no scientific research that proves that Cucumber can be used as a preservative for Squid. For this reason, it is necessary to research to examine the effect of using cucumber at different concentrations and soaking times on the organoleptic assessment of squid quality. This research was conducted in February 2020. The handling process for the Squid was carried out at the Squid shelter in Baturusa, Merawang District, Bangka Regency. In contrast, the organoleptic tests were carried out at the Aquaculture Laboratory of the University of Bangka Belitung. The research was conducted by experimental method. The research variables were differences in the concentration of grated Cucumber and differences in the length of soaking Squid. This study used RAL (Completely Randomized Design) Factorial pattern with 2 factors and 3 replications. Treatment factor by giving grated Cucumber and control or using ice cubes at different times and doses. The soaking times in this study were 24 hours and 48 hours with grated cucumber measurements of 50, 100, and 150 grams per 5 liters of water. Data analysis in this study used the Kruskarwalis test. Squid treated with grated cucumber had the same brightness level as ice cubes after 24 hours of soaking. Giving grated Cucumber does not affect the taste and texture of Squid to the level of people's preferences. Giving grated Cucumber as much as 150 g with 24 hours of soaking time can be accepted by consumers and can compete with Squid which is given ice cube treatment.
Squid, Cucumber, Organoleptic, Loligo sp
POLICY FOR THE DEVELOPMENT OF CULTIVATED FISHERY COMMERCE IN THE PROVINCE OF THE BANGKA BELITUNG ISLANDS
The trading system for aquaculture products is the process of distributing goods in the form of fish or derivative products from producers to final consumers effectively and efficiently. The objectives of this research are: 1) Analyzing aquaculture supply chain management in the Bangka Belitung Islands Province; and 2) Develop recommendations for the direction of development of the aquaculture trade system. This research method is a survey. The data sources in this research are primary and secondary data. The primary data collection method is qualitative, namely the researcher makes questionnaires, observations and interviews. Secondary data comes from production data from the Fisheries Service/BPS/pokdakan/regency/city companies in the Bangka Belitung Islands Province. Respondents in this study were informants at the District/City Fisheries Service, Pokdakan, and the shrimp farming industry (micro/small/medium/large scale). Data analysis is descriptive. The research results show that the grouper aquaculture supply chain is more efficient than the shrimp aquaculture supply chain, because it involves more companies from outside the Bangka Belitung Islands Province. The direction of development of the aquaculture trade system which refers to supply chain management has not yet implemented Minister of Maritime Affairs and Fisheries Regulation No. 5/Permen-KP/2014 concerning the National Fish Logistics System (SLIN). Understanding of the cold chain is still low. Then the problem at the collection and storage stage is the availability of facilities (cold storage) as well as the availability of basic infrastructure such as electricity, clean water and others, and the availability of facilities (unplug reefer).
Bangka Belitung, cultivation, commerce, fisheries, SLIN
REVIEW: KAJIAN KONSERVASI IKAN ENDEMIK TERANCAM PUNAH Betta burdigala (Kottelat & Ng, 1994) ASAL PERAIRAN BANGKA SELATAN
Ikan Betta burdigala (Kottelat & Ng, 1994) merupakan ikan endemik asli pulau bangka. Ikan Betta burdigala ini telah terdaftar daftar merah spesies terancam punah Red List-IUCN dengan kategori terancam kritis (Critically Endangered). Penurunan populasi ikan Betta burdigala ini disebabkan akibat adanya degradasi lingkungan, hilang atau berubahnya habitat, introduksi ikan asing dan eksploitasi yang berlebihan. Tulisan ini bertujuan untuk mengkaji ikan endemik Pulau Bangka Betta burdigala dan upaya pelestariannya sebagai dasar dalam pengelolaan ikan asli perairan Bangka. Pengelolaan sumber daya alam tidak dapat terlaksana secara efektif jika hanya dilakukan oleh pemerintah. Diperlukan partisipasi masyarakat lokal dalam proses pelaksanaan dan pemantauan pengelolaan sumber daya alam tersebu. Kompleksitas permasalahan yang muncul dalam suatu komunitas seringkali diselesaikan dengan mengacu pada kepekaan komunitas terhadap perlindungan spesies ikan endemik di wilayah tersebut, strategi pengembangan usaha perikanan yang dilaksanakan dengan cara-cara yang bijak dan bertanggung jawab, dengan memperhatikan keberlanjutan ekologi, sosial, ekonomi dan kelestarian sumber daya perikanan. Upaya pelestarian ikan endemik atau lokal dengan cara mengkonservasi pemacuan stok ikan, rehabilitasi lingkungan dan modifikasi habitat dan upaya domestikasinya. Di Pulau Bangka, rehabilitasi perlu dilakukan pada rawa-rawa dan sungai yang tercemar akibat penambangan timah. Upaya yang dapat dilakukan antara lain; membuat kolam untuk menampung limbah agar tidak langsung dibuang ke sungai atau rawa dan menanam tanaman air sebagai tempat berlindung bagi ikan lokal. Selanjutnya benih ikan hasil budidaya (aquaculture) dapat didistribusikan kembali ke habitat aslinya (restocking) untuk menjaga keberadaannya (sustainability).
Kata kunci : Betta burdigala, critically endangered, domestikasi, endemik, konservasi
CATATAN TAMBAHAN IKAN ENDEMIK Betta schalleri DI BANGKA SELATAN dan IKAN YANG BERASOSIASI
Betta schalleri, salah satu ikan endemik di Kepulauan Bangka Belitung, diketahui keberadaannya hanya di Pulau Bangka. Kajian tentang spesies ini masih sedikit dipublikasikan yang dimungkinkan karena semakin sulitnya ditemukan di habitat alami. penelitian ini mendeskripsikan tentang temuan B. schalleri di wilayah selatan Pulau Bangka dan jenis-jenis ikan yang juga ditemukan pada habitat yang sama. Betta schalleri ditemukan pada perairan aliran sungai di Kecamatan Air Gegas, Kabupaten Bangka Selatan. Ikan lain yang ditemukan berasosiasi di habitat yang sama adalah Desmopuntius hexazona, Puntius gemellus, Channa lucius, Trichopodus trichopterus, Hamirhampdon pogonognathus, Trigonopoma pauciperforatum, Trigonopoma gracile, Betta edithae, Betta chloropharynx, dan Sphaerichthys osphromenoides. Semua ikan yang ditemukan merupakan ikan endemik dan natif Sundaland.
PROXIMATE ANALYSIS OF “KERAPING MALITA” FISH AMPIANG WHICH IS SUBSTITUTED WITH CATFISH
Ampiang ikan merupakan produk kerupuk khas Pulau Bangka. Umumnya ampiang diproduksi dengan bahan baku ikan laut, sementara terdapat Ikan Lele yang lebih stabil ketersediaan dan harganya. Produk ampiang “Keraping Malita” dengan substitusi Ikan Lele menggantikan ikan laut telah diproduksi dan mendapatkan respon positif dari konsumen. Namun masih banyak masyarakat yang sangsi dengan nutrisinya sehingga perlu dilakukan kajian terkait proksimatnya. Ampiang “Keraping Malita” memiliki nilai proksimat dengan protein sebesar 13,44%, lemak 49,22%, kadar air 3,16%, dan abu 3,30%. Protein, air dan serat telah memenuhi standar SNI 01-2713-1999. Kadar lemak terlalu tinggi akibat belum optimalnya penirisan setelah penggorengan. Kadar abu lebih tinggi karena terikutnya tulang ikan dalam proses pembuatan ampiang. Perlu perbaikan proses produksi terutama pada penggunaan peniris minyak mekanis. Kata Kunci: ampiang, protein, nutrisi, Ikan Lele
EVALUATION OF WATER QUALITY FOR THE NILE FISH-FLOATING NET CAGE AQUACULTURE SYSTEM AT BANGKA BELITUNG UNIVERSITY
The water quality feasibility is an important factor in aquaculture activities and increasing the productivity of cultivated fish. The Bangka Belitung University (UBB) is developing nile fish cultivation in earthen ponds using a floating net cage system. However, there has been no study related to the quality of water in earthen ponds that can be used to determine the feasibility of using these ponds for fish farming, especially nile fish. This study aimed to evaluate the water quality for the nile fish-floating net cage aquaculture system at Bangka Belitung University. The physical and chemical parameters observed were pH, temperature, DO, BOD, COD, NH3-N, PO4-P, NO3-N, NO2-N, NH3, C-organic, and minerals. Measurements of fish performance were observed in the form of SR, ADG, SGR, absolute growth (length and weight), and FCR. The results showed that in general the water quality of the earthen pond of UBB was still feasible for nile fish cultivation which produced SR (100%), ADG (0.20 g/day), SGR (2.18%/day), and FCR (1, 3). Water quality engineering can be done by adding a water wheel to increase the concentration of dissolved oxygen and also reduce the activity of Fe and other minerals that cause acidity and inhibit the growth rate of nile fish
Environment Engineering, Fish Growth, Nile Fish, Water Quality
IKTIOFAUNA EKSOTIK DI TEBAT RASAU, BELITUNG TIMUR
Sepuluh jenis ikan yang dijumpai di perairan Tebat Rasau merupakan iktiofauna eksotik yang berpotensi menjadi ikan endemik Pulau Belitung. Hingga saat ini, masih minim kajian pada spesimen yang berstatus konservasi hampir punah maupun yang berstatus least concern ini. Penelitian ini mengkaji pada iktiofauna eksotik di Tebat Rasau, Desa Lintang, Belitung Timur menggunakan metode deskriptif eksploratif. Sepuluh jenis ikan dijumpai di perairan Tebat Rasau yang memiliki kondisi perairan dengan pH 5,73, suhu 26,1oC dan oksigen terlarut 11,4 ppm. Perairan di Tebat Rasau memiliki substrat gambut dan banyak ditumbuhi Pandaus sp. yang menutupi sebagian badan perairan. Terdapat lima jenis ikan dari perairan Tebat Rasau yang tidak dijumpai pada penelitian sebelumnya, yaitu Ikan Arwana (Scleropages formosus), Ikan Gurame Cokelat (Sphaerichthys selatanensis), Ikan Temeliyongan (Chaca bankanensis), Ikan Gurami Paros (Parosphromenus cf bintan) dan Ikan Bebidis (Brevibora cheeya).
BAKTERI PENYERAP LOGAM TIMBAL (Pb) DARI SEDIMEN DAN KERANG HIJAU, DI LAUT BANYU URIP UJUNG PANGKAH, GRESIK
Green mussels (Perna viridis) in Banyu Urip Village, Ujung Pangkah Gresik District, have great potential to be developed due to the abundant availability of seeds in nature, easy cultivation methods, namely using floating net cages and step nets, and high market demand. One of the issues with green mussels is the high content of the heavy metal Lead (Pb) in their flesh, which is caused by heavy metal accumulation in the waters. The goal of this study was to isolate, characterize, and test the ability of heavy metal Lead-Pb bacteria to biosorb heavy metal Pb in post-harvest green mussels from sediments and green mussels in the Banyu urip Ujung Pangkah Gresik Sea. The stages of the research included sampling, isolation, macroscopic and microscopic characterization, in vitro testing of Pb heavy metal absorbent. The results showed 6 bacterial isolates, namely two from green mussels coded K1 and K2 and 4 bacterial isolates from marine sediments coded S1, S2, S3 and S4. The six bacterial isolates obtained macroscopic and microscopic characteristics and have been shown in vitro to be able to grow in Nutrient agar enriched 0.8 mg/L Pb(NO3)2.
absorber, bacteria, green mussel, lead, sediment
Anti-Bacterial Effectiveness Of Cymodocea Rotundata Extract And Assay For Primary Bioactive Composition.
Anti-bacterial is a compound that can be used to inhibit bacterial growth. The compounds that play a role in damaging the cell membrane are phenols, flavonoids, and alkaloids. The phytochemical compounds above have the potential as natural Anti-bacterial on pathogenic bacteria, for example against Escherichia coli. Escherichia coli is a pathogenic microbe in humans that can cause digestive disorders and disrupt the work system of the stomach organs. Seagrass C. rotundata has compounds that are antibacterial, such as alkaloids, flavonoids, phenols, steroids, and tannins. C. rotundata can be seen in Indonesian waters. However, it has not been widely used. This study aims to determine the difference in concentration of seagrass extract of C. rotundata against E. coli anti-bacterial activity. The research method used was experimental laboratories with different concentrations of seagrass extract (10%, 20%, 30%, and 40%). The results showed that the seagrass extract of C. rotundata was effective as an antibacterial with a middle category, which is the inhibition zone ranging from 5-10 mm. Based on the studies conducted, 72 hours incubation period at 40% concentration was the best concentration to prevent E. coli at the 8.5 mm inhibition zone. Furthermore, bioactive compounds produced by C. rotundata are flavonoid compounds by showing changes in the color of the solution to yellow-orange. In addition, also produces phenol bioactive compounds by showing a change in the color of the solution to greenish, and also produces tannin bioactive compounds by showing a change in the color of the solution to blackish green. The results showed that C. rotundata can be used as a recommendation for the development of Anti-bacterial drugs in the future.
FIRST RECORD OF THE INVASIVE NILE TILAPIA Oreochromis niloticus (PERCIFORMES: CICHLIDAE) IN BANGKA ISLAND, INDONESIA
This study aims to report the presence of Tilapia Tilapia Oreochromis niloticus on Bangka Island (Indonesia) for the first time and update the invasion range of this species. Previously, this species had invaded various areas in Indonesia such as Sumatra, Java, and Sulawesi. The presence of Invasive Nila Tilapia can have a negative impact on aquatic biota through food competition, predation, and disease transmission. A total of 30 tilapia specimens were caught using Anco's fishing gear which was installed for 2 minutes consisting of mature and seeds, ranging in size from 20mm to 90mm in the Mang Kalok River, Rebo Village, Bangka Induk Regency, Bangka Island, Indonesia through a field expedition on June 11, 2023. A description of the morphological characters of the captured specimens is provided in the discussion.
Biodiversity, ecology, invasive fish, Bangka island
Adopting The Endangered Species Act (ESA)” To Protect The Vulnerable Kelik Fish (Encheloclarias Tapeinopterus, Bleeker 1853)
Encheloclarias tapeinopterus is an endemic catfish found only from Bangka Island, Indonesia. This species is listed as a Vulnerable species based on the IUCN Red List, which means that the population of this species has decreased drastically over time, and it is possible that this species will become extinct in the near future if there are no efforts to save the species. Until now, there have been no reports regarding domestication and conservation efforts for this species. In addition, there has been no socialization and punishment given to people who catch this species. Society can freely catch E. tapeinopterus without any punishment or deterrent effect. Theoretically, Indonesia actually has a Conservation Law, namely Law Number 5 of 1990 concerning Conservation of Biodiversity and Its Ecosystems which provides protection for biodiversity. However, this law talks more about the conservation system than providing legal protection for wild animals and their habitats. Based on this, the legal protection of wild animals in Indonesia needs to be improved. In this article, we describe legal certainty if Indonesia can adopt the American Wildlife Protection law "The Endangered Species Act (Esa)" in the framework of efforts to protect the endemic fish Encheloclarias Tapeinopterus which has a vulnerable status. In this paper we compare Law Number 5 of 1990 and The Endangered Species Act law.
Encheloclarias tapeinopterus, wildlife, threatened species, conservation
KOMUNIKASI SINGKAT: KEBIASAAN MAKAN IKAN KEPALA TIMAH (Aplocheilus panchax, Hamilton 1822) DI PERAIRAN EKSTREM ASAM PASCATAMBANG TIMAH TERABAIKAN
Kepala Timah (Aplocheilus panchax, Hamilton 1822) is one of the fish that has the survival abilities to live in a wide variety of quality waters. The ability of A. panchax to survive in acidic waters has begun to be widely studied as extremophile fish to study ecosystems in aquatic habitats that have acidic characteristics. This study aimed to determine the food habits of A. panchax as natural food in acid water of abandoned ex-tin mining activity. The results showed that the natural food for A. panchax was insects larvae or insects that fall on the surface of the waters. The food habits and terminal mouth type confirmed that A. panchax was surface feeder fish, carnivorous fish, larvivorous or insectivorous fish. The sagittiform body type was used A. panchax to did the strategy of feeding behavior by pursue or ambush their prey and it indicated that A. panchax as ambush predator.
Acidic Water, Aplocheilus panchax, Extremophile Fish, Insect, Natural Food
MENUJU BUDIDAYA NIHIL BIAYA PAKAN: PEMANFAATAN WOLFFIA SEBAGAI PAKAN ALAMI TERHADAP PERTUMBUHAN IKAN NILA (Oreochromis niloticus)
Pakan menjadi porsi terbesar dalam pembiayaan akuakultur. Wolffia, satu diantara jenis duckweed, dapat dikultur dengan cepat dan potensial menjadi pakan alami bagi ikan. Kultur Wolffia sebagai pakan ikan diharapkan menjadi upaya menuju budidaya ikan tanpa biaya pakan. Namun masih perlu diuji pertumbuhan ikan dengan Wolffia sebagai pakannya. Untuk itu dilakukan penelitian ini untuk mengetahui pertumbuhan Ikan Nila dengan Wolffia sebagai pakan. Perlakuan yang diberikan adalah pemberian pakan Wolffia 20 dan 30 gram per hari, serta pelet sebagai kontrol positif. Ikan Nila dengan pemberian pakan Wolffia menunjukkan pertumbuhan panjang dan bobot. Laju pertumbuhan spesifiknya sebesar 4,3 – 4,6% dan lebih besar dibandingkan pakan pelet pada 3,6%. Namun FCR yang diperoleh tinggi yaitu 7,6 – 10,2, lebih tinggi dibandingkan pelet pada 2,2. Pemberian Wolffia segar dengan kadar air lebih dari 90% diprediksi menyebabkan FCR tinggi. Wolffia berpotensi sebagai pakan alami dalam budidaya Ikan Nila dengan biaya pakan rendah atau bahkan nihil.
Ikan Nila. Wolffia, Duckweed, Pertumbuhan, FCR
MACROZOOBENTHOS COMMUNITY AS BIOINDICATOR OF WATER QUALITY FOR FISH CULTIVATION IN THE AIR DUREN RIVER, BANGKA REGENCY
Rivers are one source of water that is often used by humans for their life activities and the habitat for organisms that live in these waters. The quality decreases due to pollutants originating from domestic waste, both liquid waste and solid waste, and is also polluted by difficult organic compounds/chemicals. degraded such as detergents, phosphates or other compounds. One type of aquatic organism that is influenced by changes in the environment and water quality is macrozoobenthos, the sensitivity of macrobenthos to changes that occur in the water, making macrobenthos an indicator of the condition of a water area. This research aims to determine the diversity of macrozoobenthos as a bioindicator of water quality for fish cultivation in the Air Duren River Stream and to determine the water quality of the Air Duren River Stream for Aquaculture activities. Sampling was carried out in the Air Duren River using benthos filters. and analysis at the Aquaculture Laboratory, Faculty of Agriculture, Fisheries and Biology, Bangka Belitung University. Based on the results, it is known that the macrozoobenthos encountered were 6 species with a moderate level of diversity
C Catappa Dip Addition on Betta Fish (Betta sp) Color Change
Betta fish, one of freshwater ornamental fish aquaculture commodities which has high sale value. Betta fish has various pattern and unique fish fin shape. Cattapa dip was a fish health product consisting of catappa leaves and vitamin C. This product could be use for betta fish cultivation so as not to be attacked by parasites, fungi, bacteria and also for helping the process of betta fish color changing. Cattapa dip could also maintain the stability of the water pH in betta fish cultivation. This product has a shape resembling a tea bag product which is very attractive and unique. This study consisted of 4 treatments and 3 replications. The treatments given were Treatment A (0.3 gram of catappa leaves and 0.1 gram vitamin C), Treatment B (0.5 gram of catappa leaves and 0.1 gram of vitamin C), Treatment C (0.7 gram of catappa leaves and 0.1 gram of vitamin C) and K treatment / control (without treatment). The parameter observed during the study was the color change of Betta fish (Betta sp) which was measured by the percentage of color change based on RGB (Red Green Blue) using the Color Picker application. The results showed that the treatment with the addition of Kataplus in the form of dip as much as 0.5 gram of ketapang leaves and 0.1 gram of vitamin C was the best treatment. Based on the results of the color changes that occur in treatments A, B, C with 3 color indicators namely Green (green), Red (red), and Blue (blue). Color changes occurred in weeks 1st to week 4th where the best were obtained in treatment B with the average percentage produced, namely Red of 125,975%, Green of 111,375% and Blue of 116,6%. So it could be conclude that the use of Cattapa dip has an effect on color changes in Betta fish (Betta sp).
Betta sp, color change, Terminalia catappa leaves
KARAKTERISASI MORFOLOGIS BETTA EDITHAE YANG TERDAPAT DI KABUPATEN BANGKA TENGAH DAN KABUPATEN BANGKA SELATAN
Betta edithae is one of the native freshwater fish species found on Bangka Island. This species has the potential to be developed as an ornamental fish because it has a unique and attractive body shape. However, its presence in nature is currently threatened by environmental degradation, habitat loss or change, introduction of foreign fish and overexploitation. The existence of Betta edithae species in Bangka Island, especially in Central Bangka and South Bangka districts, has never been reported scientifically. Therefore, the description of Betta edithae species in Central Bangka Regency and South Bangka Regency needs to be analyzed based on morphological aspects. This study aims to determine the morphological characteristics of Betta edithae species found in Central Bangka and South Bangka. The research method was carried out qualitatively with an exploratory descriptive approach. The results of the study show that the morphological characterization of Betta edithae found in Central Bangka and South Bangka districts shows that both fish have the same morphology. Morphometric character measurements of Betta edithae fish found in Central Bangka and South Bangka show that Betta edithae fish found in Central Bangka have a total length of 4.36 cm, which is greater than Betta edithae found in South Bangka. The meristic characters of Betta edithae fish found in the Central Bangka district are D.I.8, A.23, P.8, V.I.4, C.12. The meristic characters of Betta edithae fish found in South Bangka district are D.I.7, A.23, P.6, V.1.4, C.12.
Keywords: Betta edithae, morphology, morphometric, meristic.
Copyright (c) 2024 Journal of Aquatropica Asia
A REVIEW: FACILE AND GREEN SYNTHESIS OF MARINE MACROALGAE AND ITS PHOTOCATALYTIC PERFORMANCE ON POLLUTED WATER REMEDIATION
This review critically examines the burgeoning field of research focused on the environmentally benign synthesis of metallic nanoparticles exploiting the unique properties and diverse array of marine macroalgae species. Harnessing macroalgal biomolecules as reductants and stabilizers, numerous findings have discovered the biosynthesis of silver, gold, iron oxide, zinc oxide, and other nanoparticles through a sustainable "phycosynthesis" technique without toxic chemicals. Extensively characterized for their morphologies and properties, these algae-mediated nanoparticles exhibit notable photocatalytic activities in degrading various organic dyes and pollutants. Particularly, over 90% degradation efficiency has been achieved for dyes like methylene blue, methyl orange, and rhodamine B utilizing nanoparticles produced from macroalgae such as Sargassum horneri, Syringodium isoetifolium and Ulva lactuca. The mechanism is hypothesized to involve photoexcitation generating reactive oxidative species on the nanoparticle surface that rapidly cleave dye molecules. Improved understanding of the roles of macroalgal biomolecules and optimization of synthesis conditions may enable enhanced catalytic performances. With their widespread availability and biodiversity remaining largely untapped, marine macroalgae prove promising as renewable resources for developing eco-friendly water remediation technologies through metal/metal oxide nanocatalyst design.
A Profil Endoparasit yang Menginfeksi Ikan Lele di Balai Benih Ikan Lokal Air Mawar Kota PangkalPinang
Penelitian ini bertujuan untuk mengetahui profil endoparasit yang menginfeksi ikan lele di Balai Benih Ikan Lokal (BBIL) Air Mawar Kota Pangkalpinang. Pengambilan 30 ikan sampel dilakukan secara acak. Pengamatan endoparasit meliputi bagian dalam ikan lele yaitu daging, hati, usus dan lambung. Data penelitian dianalisis secara deskriptif serta disajikan dalam tabel dan gambar. Hasil penelitian menunjukkan bahwa jenis endoparasit yang menginfeksi organ ikan sampel antara lain Ascaris Lumbricoides, Trichuris trichiura, Strongyloides stercoralis, Capillaria sp, dan Anisakis sp. Tingkat prevalensi parasit yang menginfeksi ikan lele di BBIL yaitu 90% dengan kategori hampir selalu dan keterangan infeksi parah. Intensitas endoparasit tertinggi yang menyerang ikan lele yaitu oleh parasit Trichuris Trichiura dengan nilai intensitas 6,23 individu per ekor dengan kategori sedang, sedangkan untuk nilai intensitas terendah yaitu oleh parasit Anisakis sp dengan nilai intensitas 1,57 individu per ekor. Penelitian ini bertujuan untuk mengetahui profil endoparasit yang menginfeksi ikan lele di Balai Benih Ikan Lokal (BBIL) Air Mawar Kota Pangkalpinang. Pengambilan 30 ikan sampel dilakukan secara acak. Pengamatan endoparasit meliputi bagian dalam ikan lele yaitu daging, hati, usus dan lambung. Data penelitian dianalisis secara deskriptif serta disajikan dalam tabel dan gambar. Hasil penelitian menunjukkan bahwa jenis endoparasit yang menginfeksi organ ikan sampel antara lain Ascaris Lumbricoides, Trichuris trichiura, Strongyloides stercoralis, Capillaria sp, dan Anisakis sp. Tingkat prevalensi parasit yang menginfeksi ikan lele di BBIL yaitu 90% dengan kategori hampir selalu dan keterangan infeksi parah. Intensitas endoparasit tertinggi yang menyerang ikan lele yaitu oleh parasit Trichuris Trichiura dengan nilai intensitas 6,23 individu per ekor dengan kategori sedang, sedangkan untuk nilai intensitas terendah yaitu oleh parasit Anisakis sp dengan nilai intensitas 1,57 individu per ekor.
Identifikasi, Endoparasit, Ikan Lele, Prevalensi, Intensitas, Kualitas Air, BangkaBelitung
IDENTIFIKASI VEGETASI PADA KOLONG PASCATAMBANG TIMAH DIDESA NIBUNG DAN RIDING PANJANG KEPULAUAN BANGKA BELITUNG
Bangka Belitung merupakan salah satu provinsi yang dikenal sebagai daerah penghasil Timah terbesar di Indonesia bahkan menjadi penghasil timah terbesar di dunia. Dari sekian banyak tempat penambangan timah di Bangka Belitung terdapat satu Desa di Kabupaten Bangka Kecamatan Merawang yaitu Desa riding panjang dan desa nibung yang berada di kecamatan koba bangka tengah yang juga menjadi tempat penambangan timah yang berada di Bangka.Vegetasi Keanekaragaman Vegetasi (tumbuhan) yang tergambar pada hutan-hutan yang tersebar diseluruh kawasan Indonesia. Vegetasi merupakan kumpulan tanaman yang biasanya terdiri dari beberapa jenis yang hidup bersama-sama di suatu tempat. Dalam mekanisme kehidupan bersama terdapat interaksi yang cukup erat, baik antar individu suatu vegetasi maupun dengan organisme lainnya.egetasi tanaman yang ditemukan yaitu Putri Malu ( Mimosa Pudica ), Lakum Air ( Ludwigia Octovalvis ), Daun Simpur ( Dillenia Indica.L ), Paku Kawat ( Lycopodiopsida ) Colombian Waxweed ( Cuphea Carthagenensis ), Senggani ( Melastoma ), Kantong Semar ( Nephentes Sp ), Paku Lemiding ( Stenochlaena Palustris ), Ilalang ( Imperata Cylindrica ), Niaouli ( Melaleuca Quinquenervia ), Pakis Karang ( Gleichenia Dicarpa ), Purun Danau ( Lepironia Articulata).
Asam Bangka Tambang Timah Vegetasi Keanekaragaman
KINERJA REPRODUKSI IKAN SELUANG (Brevibora dorsiocellata) DENGAN SUPLEMENTASI VITAMIN E DALAM PAKAN
Ikan Seluang (Brevibora dorsiocellata) memiliki bercak hitam (Eyespot) pada sirip punggungnya dan memiliki warna yang menarik. Ikan ini merupakan salah satu ikan alam yang berpotensi sebagai ikan hias air tawar lokal dengan nilai jual cukup tinggi, sehingga perlu dilakukannya domestikasi. Pematangan gonad dengan upaya suplementasi vitamin E untuk perbaikan nutrisi pada pakan induk. Vitamin E adalah mikronutrien yang sangat penting dan berperan penting dalam pertumbuhan, reproduksi, dan kesehatan ikan. Tujuan dari penelitian ini adalah untuk mengetahui efektivitas suplementasi vitamin E terhadap pematangan gonad dan mendapatkan dosis terbaik yang dapat diterapkan pada budidaya B. dorsiocellata. Penelitian ini dilaksanakan pada bulan Desember-Januari 2024 di Hatchery Akuakultur, Laboratorium Akuakultur, Fakultas Pertanian Perikanan dan Kelautan, Universitas Bangka Belitung. Penelitian ini menggunakan 4 perlakuan dengan 3 kali ulangan, yaitu kontrol tanpa suplementasi vitamin E (P1), suplementasi vitamin E 250 mg/kg pakan (P2), 375 mg/kg pakan (P3) dan 500 mg/kg pakan (P4). Hasil penelitian menunjukkan bahwa suplementasi vitamin E pada pakan memberikan hasil tertinggi pada P4 di akhir pengamatan dengan nilai Gonado Somatic Index (GSI) sebesar 4,94±0,23%, nilai Hepato Somatic Index (HSI) 4,12 ± 0,26% dan fekunditas 86 butir telur pada hari ke 30. Pertumbuhan panjang mutlak nilai tertinggi pada P3 dengan nilai 0,49±0,16 cm dan pertumbuhan bobot mutlak terdapat pada P2 dengan nilai 0,26±0,09 g. Kualitas air selama pemeliharaan pH 6,3-6,7, suhu 26-28 ˚C, dan DO 6,2-6,6 ppm. Suplementasi vitamin E dalam pakan dapat meningkatkan pematangan gonad pada ikan seluang (B. dorsiocellata).
PENGAMATAN PENGAMATAN PERKEMBANGAN TELUR CUMI BANGKA (Uroteuthis chinensis) DAN MODIFIKASI PAKAN PASCA MENETAS
Cumi Bangka (Uroteuthis chinensis) merupakan komdoditas perikanan yang memiliki nilai ekonimis yang tinggi dan salah satu komoditas unggulan strategis dalam sektor perikanan dan kelautan karena memiliki kualitas terbaik di pasar ekspor. Namun dikarenakan eksploitasi penangkapan cumi-cumi yang berlebihan, dan rusaknya habitat penempelan telur, sekaligus habitat pemijahan cumi-cumi akibat berbagai aktivitas teresterial, khususnya aktivitas penambangan pasir timah laut, menjadikan jumlah tangkapan cumi Bangka jauh menurun. Perubahan iklim global yang ekstrim, juga menjadi pemicu berkurangnya jumlah cumi di alam. Penelitian ini bertujuan untuk mempelajari perubahan morfologi telur cumi Bangka (U. Chinensis) sebelum menetas dan mengukur survival rate larva cumi pasca menetas, yang diberikan pakan buatan dan pakan egg custard di modifikasi. Pengamatan morfologi dilakukan secara langsung setiap 24 jam, sejak diambil dari alam samapi menetas di bak pemeliharaan. Dengan mengamati perubahan bentuk morfologi, bobot dan panjang telur. Selanjutnya pemberian pakan buatan dan egg custard di modifikasi setelah telur menetas diberikan lima kali dalam sehari, yakni pada jam 07.00 pagi, jam 11.00 siang, jam 15.00 sore, jam 19.00 malam, 23.00 malam. Hasilnya menunjukkan bahwa, dimedia tetas dibutuhkan waktu 6-9 hari bagi telur cumi untuk menetas. Setiap hari terjadi perubahan morfologi telur yang semakin membesar dan pemisahan jonjot yang jelas disetiap kapsul telur. Hatching Rate cumi mencapai 65,40 %, pada salinitas 31-35 ppt. Pemberian tiga jenis pakan buatan, yakni Otohime B2, Feng-Li 0 dan Scretting Stella B-2 mampu membuat larva cumi bertahan selama 3 dan 4 hari. Pemberian pakan tiga jenis egg custard di modifikasi hanya mampu membuat larva cumi bertahan selama 4 dan 5 hari.
Sea water, Bangka squid, Uroteuthis chinensis, egg custard, Bangka Belitung
PENGUJIAN ZONA INHIBISI DIFUSI CAKRAM EKSTRAK RUMPUT LAUT MERAH (Eucheuma cottonii) SEBAGAI ANTIBAKTERI TERHADAP Streptococcus mutans
Penelitian bertujuan untuk menguji aktivitas antibakteri ekstrak Eucheuma cottonii terhadap Streptococcus mutans menggunakan metode difusi cakram. Streptococcus mutans merupakan penyebab utama karies gigi, dan pemanfaatan bahan alam seperti alga merah dapat menjadi alternatif pengganti antibiotik sintetis. Sampel Eucheuma cottonii yang diperoleh dari Pesisir Desa Ruguk, Lampung Selatan, dimaserasi dengan pelarut metanol, kemudian diekstraksi menggunakan metode rotary evaporator dan water bath. Ekstrak diuji pada berbagai konsentrasi (10.000, 5.000, 1.000, 100, 10 ppm) untuk mengukur zona hambat terhadap bakteri uji. Hasil menunjukkan bahwa metode water bath menghasilkan zona hambat maksimal sebesar 2 mm pada konsentrasi 10.000 ppm dalam 24 jam pertama, tetapi efek antibakteri melemah seiring waktu. Metode rotary evaporator menunjukkan hasil yang berfluktuasi, dengan zona hambat terbesar pada konsentrasi 5.000 ppm sebesar 0,90 mm dan anomali pada konsentrasi rendah setelah inkubasi lebih lama. Secara keseluruhan, aktivitas antibakteri tergolong lemah (<5 mm), menunjukkan sifat bakteriostatik, yakni menghambat pertumbuhan tanpa membunuh bakteri secara permanen. Metode water bath lebih unggul dalam menghasilkan ekstrak yang stabil dengan aktivitas antibakteri konsisten dibandingkan rotary evaporator. Penelitian ini menyimpulkan bahwa ekstrak Eucheuma cottonii memiliki potensi antibakteri, tetapi optimasi lebih lanjut diperlukan untuk meningkatkan efektivitasnya terhadap Streptococcus mutans.