Plankton community structure and water conditions of Jatigede Reservoir for the sustainability of fisheries

Abstract

Phytoplankton and zooplankton are tiny organisms that are vital components in the water. Plankton community structure reflects the effect of the water condition and plankton is a natural food for fish. This study aims to determine the community structure of the plankton and the water condition of the Jatigede reservoir for the sustainability of fisheries. The type of research used is descriptive quantitative with 7 sampling stations. The Results reveal that there were 35 types of phytoplankton species and the diversity index ranges 0.968-1.539, the evenness index ranges 0.349-0.506 (the level is low to moderate), and the dominance index ranges 0.240-0.465 (the dominance levels are low). There were 36 types of zooplankton species and the diversity index ranged 1.558-1.988, the evenness index ranged 0.497-0.653 the level is at a moderate level (labile toward stable) and the dominance index ranged 0.157-0.352 (the dominance levels are low). The water quality status reveals that Jatigede Reservoir is in moderately polluted condition based on the quality standard limits in class 2 and class 3 which are intended for the fishery sector. It means that the water conditions of the Jatigede Reservoir are starting to be disturbed for the sustainability of fish.