Study of Fertility Levels of the Limbung River, Jada Bahrin Village, merawang District Bangka Regency.

Limbung, River, Trophic State, TSI

Abstract

The Limbung River is one of the rivers in the Bangka Belitung Archipelago Province, located in Jada Bahrin Village, Merawang District, Bangka Regency. In the waters of the Limbung River there is anthropogenic activites, which as a result of anthropogenic activities can increasing of trophic state of water. This research aimed to evaluate trophic state of the Limbung River. Reasearch conduced at September to December 2022. Water parameter where in-situ measurement was temperature, water depth, secchi depth, water flow speed, pH, and dissolved oxygen. Water sample analysed at the Fisheries Laboratory of Aquatic Resources Management and the Biology Laboratory at the University of Bangka Belitung, the water parameter was chlorophyll-a. Water sample analysed at the PT Global Quality Analytical Laboratory, Bogor, the water parameter was total phosphate. This research uses the observation method, determining the research location using the purposive sampling method, and the results were analyzed with Trophic State Index (TSI) method. The result obtained at station 1is 54,88, station 2 is 57,53, station 3 is 61,16, station 4 is 58,43, and station 5 is 61,55.  It means the trophic state in the waters of the Limbung River ranges from 54,88-61,55, the waters of the Limbung River are classified as light eutrophic to moderately eutrophic, show by the turbid color of the water and low water brightness.