Analysis of Trophic State Based on Trophic State Index (TSI) and Trophic Level Index (TLI) in the Bumang River, Bangka Regency

Abstract

The Bumang River is one of the rivers in Bangka Regency. The Bumang River is widely used by local communities to carry out various activities, which can cause changes in water quality which will reduce the usability, productivity, carrying capacity and capacity of water resources. Therefore, this research was conducted to analyze the environmental parameters of the Bumang River and determine the fertility of the waters of the Bumang River. Data collection was carried out in May – July 2023 in the Bumang River. This researchwas conducted at three stations on the Bumang River. Trophic state analysis uses the TSI and TLI methods. The research results show that the physical, chemical and biological parameters of the Bumang River waters are in ideal conditions for the growth of aquatic organisms. The calculation results using the TSI method when collecting data in May are included in the mesotrophic category, in June it is included in the mesotrophic and oligotrophic categories and in July it is included in the mesotrophic categories. The results obtained using the TLI method were in May including mesotrop, in June including mesotrop and oligotrop, and in July including mesotrop. Based on these results, it can be concluded that the trophic state conditions of the waters in the Bumang River can be categorized as mesotrophic-oligotrophic.