Abstract
Selorejo reservoir is polluted by heavy metals, whose levels exceed quality standards of Hg (0.03mg/l), Pb (0.0015 mg/l), Cd (0.0018 mg/l) and Phenol (0.009 mg/l) (Perum Jasa Tirta, 2019) and it isfeared that such condition will undermine Nile Tilapiaâs health. This study aimed to conductan analysis of Tilapiaâs health status as the indicator of the environmental assessment of Selorejo Reservoir.Additionally, the histology of kidneys, livers, gills and histologyof Tilapia were used to measurethe impact of environmental contamination. This research was conducted from March to April 2021using survey method. 36 fish samples were taken randomly for each sampling. Water qualityparameters such as temperature, pH, and dissolved oxygen were in accordance with the waterquality standards, while the results of histological analysis on the kidneys, liver and gills showedthat 50-75% of those organs suffered from mild to moderate damage such as necrotic, congestion,cell degeneration and hypertrophy. The results of hematological and micronucleus analysisshowed that Tilapia fish from Selorejo Reservoir were unhealthy as a result of exposure to heavymetal Pb of 0.03-0.08 mg/l. Histological and hematological analyses in this research showed thatTilapia from Selorejo Reservoir were unhealthy, so there is a need for better environmentalmanagement and programs for monitoring hazardous materials in the ecosystem.
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