| Summary: | The polyculture system cultivation activity is an effort to increase the production of aquaculture and optimal use of ecological space/niches. Water quality is a living medium for aquatic biota that really needs to be considered. This study aims to evaluate the water quality and species composition of plankton in a polyculture system. Water quality factors were temperature, dissolved oxygen, temperature, pH, alkalinity, salinity, ammonia, nitrite, nitrate, phosphate, and total organic matter. The variables observed during the study were water quality including dissolved oxygen, pH, temperature, alkalinity, salinity, phosphate, total organic matter, ammonia, nitrite, and nitrate. Plankton including phytoplankton and zooplankton were observed every two weeks. The results of the research on monitoring water quality parameters, the temperature range 28.4-32.4 0C, dissolved oxygen in treatment A ranged from 2.55-4.56 mg/L, treatment B ranged from 2.58-4.57 mg/L, and treatment C ranged from 2.25-3.43 mg/L, Ammonia content in treatment A 0.0255-0.4913 mg/L, treatment B 0.0282- 0.5409 mg/L, treatment C 0.0427-0.3799 mg/L. The plankton community found during the study in each treatment were 22 species, consisting of 9 types of phytoplankton and 13 types of zooplankton. The most type of phytoplankton was Oscillatoria sp 16,362 ind/L and zooplankton was Nauplii Copepod 2,659 ind/L.
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