Study on impact of parboiled rice mill effluents on biochemical constituents of Labeo rohita (Hamilton 1822)

Abstract

The parboiled rice mill effluents (PRME) are among the major contributors of chemical pollutants that enter into various aquatic bodies and affect the aquatic biota, accounting for several types of chemicals released in the nearby areas. The present investigation (2021-22), fingerlings of Labeo rohita was exposed to acute (96 hrs) and chronic (30 days) dose of parboiled rice mill effluents (PRME). The PRME collected from the parboiled rice mills were analyzed for Physico-chemical parameters and chronic and acute toxicity tests in Labeo rohita fish. The results showed that the severity in the Physico-chemical parameters and toxicity levels cause moderate to massive destruction in gills, liver and muscle, which is concentration and time-dependent. In acute toxicity experiments (96hrs) the fingerlings of fresh water fish Labeo rohita was exposed to different concentrations of (12.5%, 25%, 50%, 75% and 100%) parboiled rice mill effluents. The LC50 value for various exposure times was determined and analyzed by using Finney probit method. The value of LC50 of untreated (UT) parboiled rice mill effluents after 96hrs was calculated as 88%.