Journal of Tropical Marine Science

The Optimasi Rendemen Minyak Mikroalga Laut Nannochloropsis sp. Menggunakan Metode Tekanan Osmotik NaCl(aq)

Moh Muhaemin, Zelang Pasa, Mahrus Ali — Wed, 11 Oct 2023 00:00:00 +0000

Biodiesel is derived from natural fats such as vegetable or animal oils. This study uses a type of microalgae that can produce products and has the potential as biodiesel fuel, namely Nannochloropsis sp. The purpose of this study was to determine the effect of osmotic shock on the oil yield of Nannochloropsis sp. to determine the optimum osmotic shock, and to determine the composition of fatty acid content in the microalgae Nanochloropsis sp. in both wet and dry conditions. The extraction process in this study used five variations of osmotic shock, namely 0, 30, 60, 90 and 120 atm. The results showed that osmotic shock had an effect on both oil yields of Nannochloropsis sp. both in wet conditions (R=0.890 Sig<0.043) and Nannochloropsis sp. dry conditions (R=0.916 Sig<0.029). So that the higher the osmotic shock applied, the higher the yield of Nannochloropsis sp. wet and oil yield of Nannochloropsis sp. dry. then the osmotic stress of 120atm is good for extracting the oil of Nannochloropsis sp. Each result obtained is Nannochloropsis sp. wet atm 120 atm (3.96 %) and for Nannochloropsis sp. dry 120 atm (2.60 %). Results of GC Chromatogram analysis on oil yield of Nannochloropsis sp. 13 fatty acids were found including saturated fat: octanoate (C8:0), laurate (C12:0), tetradecanoate (C14:0), heptadecanoate (C17:0), arachidate (C20:0), heneicosanoate (C21:0), tricosanoate (C23:0), lignocerate (C24:0) dan lemak tak jenuh palmitoleate (C16:1), oleic (C18:1), linolelaidic (C18:2), nervonate (C24:1), dan docosahexaenoate (C22:6).

Analisis Kesesuaian Wisata Bahari Di Pulau Semujur Kabupaten Bangka Tengah

Ikhwan Fauzi, Indra Ambalika Syari, Eva Utami — Wed, 11 Oct 2023 00:00:00 +0000

The study of marine tourism locations in the Semujur Island area is a problem that needs to be studied in order to increase the satisfaction and safety of the people who carry out tourism activities. Semujur Island is a marine conservation area that is protected and managed to realize sustainable management of fish resources and the environment.This study aims to analyze the suitability index of beach recreation tourism and analyze the suitability index of snorkeling tourism on Semujur Island and is expected to be used as a reference for stakeholders involved in tourism development on Semujur Island, Central Bangka Regency. Sampling was carried out in March 2021 at Semujur Beach, Central Bangka Regency. The research method used is purposive sampling. Data analysis was based on the tourism suitability index (IKW) matrix. The results of the study of the suitability of beach recreation tourism and snorkeling tourism on Semujur Island showed that the index value of the suitability of beach recreation tourism at each observation station got a value of 83% (very suitable). The value of the suitability index for snorkeling tourism at each observation station is 57.75% (appropriate).

Karakteristik Morfologi Dan Sebaran Lamun Halophila spinulosa (R.Br.) Aschers. Di Kepulauan Bangka Belitung, Indonesia

Wahyu Adi, M. Rizza Muftiadi, Henri Henri, Aditya Pamungkas, Okto Supratman — Wed, 11 Oct 2023 00:00:00 +0000

Halophila spinulosa (R. Br.) Aschers is a type of seagrass found in Indonesia with limited distribution. One of the areas where Halophila spinulosa is found in the Bangka Belitung Islands. Although found in the Bangka Belitung Islands, information on this type of seagrass is very limited. The objectives of the study were to identify morphological characters, identify types of seagrass associated with Halophila spinulosa and present a distribution map of Halophila spinulosa in the Bangka Belitung Islands. The research method for seagrass morphological characters is based on field data in the form of photographs, then compared with identification sources from books and research journals. The seagrass distribution map was determined based on a literature search from 2015 to 2022 and then a map was made using Arcmap 10.8 software. The results of the research on the morphological characters of Halophila spinulosa species can be seen from the shape of the roots, rhizomes, leaves, flowers and fruit. This type of root form is unbranched root (simple root) and each node on the rhizome has one root. Compound leaves are elliptical in shape. These leaves are paired, in opposite positions, located in one plane, arranged obliquely around the stem and have serrated leaf tips. The distribution of Halophila spinulosa seagrass in the Bangka Belitung Islands is spread in the areas of Central Bangka Regency, South Bangka Regency and Belitung Regency. Halophila spinulosa species are often found mixed (associated) with seagrass species Halodule uninervis and Oceana serrulata.

Social Characteristics of Squid Fishermen Conditions in Improving Household Welfare and Income, Lampung

Wed, 11 Oct 2023 00:00:00 +0000

The level of income determines the welfare of fishermen. The aim of this study was to determine the relationship between the income level of squid fishermen and household incomse with the condition of squid fishermen. This study was conducted in Sukajaya Lempasing Village, Teluk Pandan District, Pesawaran Regency, Lampung. The results of the study showed that squid fisherman households with income above the minimum wage (prosperous) value have side jobs that can increase their income to meet the daily needs. The welfare level of squid fishermen is in the poor to moderate category. Education is a human right for every Indonesian citizen, thus every citizen has the right to get a proper education. Education is an important indicator in measuring household welfare. The difference in the education level will certainly affect the level of welfare obtained by each household. Most of the squid fishermen are in a prosperous condition because they have high scores on every welfare indicator, especially on education indicators, consumption levels and patterns as well as housing and environmental indicators.

value economyc Valuasi Ekonomi Sumber Daya Kelautan dan Perikanan di Pulau Tikus Kota Bengkulu

Zamdial Zamdial, Dede Hartono, Octianto Syahputra — Wed, 11 Oct 2023 00:00:00 +0000

Tikus Island is surrounded by a coral reef so that it is able to protect the island from abrasion due to large waves. The coastal and marine resources of Tikus Island have various ecological and economic functions. The purpose of this study is to calculate and analyze the total benefit value of potential marine and fisheries resources in the Tikus Island Area, Malabro Village, Teluk Segara District, Bengkulu City. This research was conducted in March - April 2022. This study used a comprehensive survey method. Sampling using Purposive Sampling technique. Respondents value the benefits of existence consist of the level of education, namely with the Axidental Sampling technique. The results of this study obtained the total benefit value of marine and fisheries resources on Tikus Island is Rp. 19.205.799.426,-/year with a direct use value of Rp. 2.455.820.000,-/year, inderect use value of Rp.989.047.590 ,-/year, option value of Rp. 681.424.836,-/year, excitence value of Rp. 14.833.925.000,-/ year, bequest value Rp. 245.582.000,-/year Keywords : Economic Valuation, Tikus Island, Direct Use Value, Indirect Use Value, Total Economic Value

Potensi Antibakteri Dari Ekstrak Polychaeta Namanereis sp.

Wed, 11 Oct 2023 00:00:00 +0000

Namanereis sp. is classified into the Family Nereididae, class Polychaeta. The research on Polychaeta in Indonesia, is still basic research covering taxonomy, ecology and community structure. The research on nutritional content, natural feed and active ingredient content are still rarely done. This research was conducted on the antibacterial agent of Namanereis sp extract with Ethyl Acetate as solvent against Aeromonas hydrophila, Vibrio parahaemolyticus and Vibrio harveyi bacteria. Therefore, this study aimed to determine the antibacterial activity of the Namanereis sp extract against A. hydrophila, V. parahaemolyticus and V. harveyi bacteria. The method used in this research was laboratory experiment. The treatment was carried out by treating the extraction concentration of Namanereis sp. 100 grams of wet sample of Namanereis sp. was extracted with 400 mL of Ethyl Acetate as a solvent. The bacteria used in this study were A. hydropila, V. parahaemolyticus and V. harveyi which were obtained from BBPAP Jepara. Based on the results of the study, the inhibition zone formed for V. harveyi at a concentration of 100% was 3.18 ± 0.32 cm², the inhibition zone for A. hydrophila was 2,96 ± 0,45 cm² and the inhibition zone formed for V. parahaemolyticus was 2,7 ± 0.91 cm². It can be concluded that the extraction of Namaneries sp. using ethyl acetate solvent can inhibit zones for each given concentration treatment (6,25, 12.5, 25, 50 and 100%).

Contamination Status of Lead (Pb) And Copper (Cu) Heavy Metals On The Surface Of The Sediment At Sampur Beach, Central Bangka

Kasi Sastra, Mohammad Agung Nugraha, Aditya Pamungkas — Wed, 11 Oct 2023 00:00:00 +0000

Sampur Beach is one of the beaches in Central Bangka Regency with tin mining activities and a fishing area. Heavy metals in the human body can disrupt the work of enzymes and metabolism, causing cancer and mutations. This study aims to determine the status of heavy metal Pb and Cu contamination in the surface sediments of Sampur Beach. Heavy metal analysis uses the Atomic Absorption Spectrophotometry (AAS) method. The research results show that the condition of the sediment texture at Sampur Beach has a sandy to clayey sand substrate (83.09%-94.89%) and has a low Total Organic Matter (BOT) value (0.96-1.54%). The contamination factor values for metals Pb (0.00026 – 0.00036) and Cu (0.00285–0.00298) are low while the enrichment factors are high for metals Pb (95.69-220.44) and Cu (1090.89). –2084.60) which indicates the presence of anthropogenic input in addition to natural input. The geoaccumulation index for Sampur Beach is low for Pb (-12.502 to -12.038) and Cu (-9.042 to -8.975) and the PLI value for Pb and Cu metals (0.00087–0.00103) is not polluted to slightly polluted.

Karakteristik, Warna, Dan Ukuran Mikroplastik Yang Ditemukan Pada Air Dan Kerang Hijau Di Pulau Pasaran, Lampung

Wed, 11 Oct 2023 00:00:00 +0000

Plastic waste will be degraded into microplastic which has a size of ≤ 5 mm. These microplastic particles change in size and color due to various natural processes that occur in the environment. The purpose of this study was to determine the shape, color and size characteristics of microplastics found around Pasaran Island. Sampling was carried out by taking microplastic samples in water and green mussels around Pasaran Island. Based on the research results, microplastic fragments, films, fibers, granules and foam were found. Microplastic colors consist of black, blue, green, yellow, red, clear, and white. Microplastic fragments, films and fibers were found in the <50µm to 1000 - 5000 µm size group. Granular microplastic types were found in the <50 µm to 100 - 500 µm size group and foam types were found in the <50 µm to 500 - 1000 µm size group.

Kontaminasi Dan Distribusi Logam Berat Tembaga (Cu) Dan Zink (Zn) Pada Sedimen Perairan Baturusa, Provinsi Kepulauan Bangka Belitung

Jodi Rohman, Mohammad Agung Nugraha, Irma Akhrianti — Wed, 11 Oct 2023 00:00:00 +0000

The Baturusa River receives input from various activities ranging from industry, mining, fisheries, large-scale plantations and shipping ports. This research aims to determine the concentration of the heavy metals Copper (Cu) and Zinc (Zn) as well as the status of the level of contamination, contamination and enrichment of the heavy metals copper (Cu) and zinc (Zn) in Baturusa Waters, Bangka Belitung Islands Province. Heavy metal analysis using the AAS method. Concentrations of heavy metals Cu and Zn ranged from 0.73-2.29 mg/kg and ranged from 1.45-14.74 mg/kg. The contamination factor values for heavy metals Cu and Zn are included in the low contamination level (CF<1) with a range of Cu 0.016-0.050 and Zn 0.015-0.155. The results of the I-geo value for Heavy Metal Cu range from -4.881 to -6.530 and for Heavy Metal Zn range from -3.273 to -6.618 which shows that the I-geo value (<0) means it is not contaminated with heavy metals. The PLI value ranges from 0.01-0.08, indicating it is not contaminated. The EF value for the heavy metal Zn is greater than for the heavy metal Cu (Zn>Cu), the value for Cu is 2.32-7.54 and Zn 2.59-11.27. The EF values of the heavy metals Cu and Zn are included in the moderate to sufficient enrichment level category. Variations in EF values in the waters of the Baturusa Estuary, Bangka Belitung Islands Province show that there is input from anthropogenic sources at all stations as well as input from natural weathering processes from land (both physical and chemical).

Kajian Ektoparasit pada Budidaya Ikan Kerapu Cantang (Epinephelus fuscoguttatus x E. lanceolatus) di Perairan Ringgung dan Durian, Pesawaran, Lampung : Identifikasi, Prevalensi, dan Intensitas

Wed, 11 Oct 2023 00:00:00 +0000

The study was conducted to evaluate the prevalence, intensity, and identification of ectoparasites in Cantang grouper in the waters of Ringgung and Durian, Pesawaran Regency, Lampung. Research method with random sampling in two locations of floating net cages in Lampung Bay at Ringgung and Durian waters. Sampling was done three times with a total of 30 fish at each location (10 fish each sampling). Ectoparasite observations were carried out at the Laboratory of Fish and Environmental Health, Main Center for Marine Aquaculture Fisheries of Lampung. The results showed there were 3 species of ectoparasites that infected cantang grouper in Ringgung and Durian waters, namely Pseudorhabdosynochus sp., Neobenedenia sp., and Brooklynella sp. Ectoparasites Pseudorhabdosynochus sp. had a prevalence value of 100% at location one, and ectoparasites Brooklynella sp. had an intensity value of 873 individuals at location two. The diversity index (H’) at location one is 0.18 and at location two is 0.10. The uniformity index (e) at location one is 0.27 and at location two was 0.09. The Dominance index (c) at location one 0.91 and location two 0.96. Based on these results, the highest prevalence value was in Pseudorhabdosynocus sp. and the highest intensity value was in Brooklynella sp.. The results also showed a co-infection of 30% in Cantang grouper samples from Ringgung waters. The gill organs were dominantly infected by Pseudorhabdosynocus sp., while the dominant slime was infected by Neobenedenia sp. and Brooklynella sp.