Ecology, Environment and Conservation Paper

Vol.17, Issue 2, 2011; Page No.(287-289)

EFFECT OF COCONUT HUSK RETTING ON ETROPLUS MACULATUS (BLOCH)

Swapna Sudhakaran, C.K. Deepa and K Shiny Sreedhar

Abstract

The continued and intensive exploitation of the backwaters of Kerala for coconut husk retting has caused deleterious effect on aquatic ecosystem and fishery resources. The Physico-chemical parameters- pH, temperature, dissolved oxygen, free carbon dioxide, nitrate and phosphate - of the water in the retting and non retting zones have been studied. An acidic pH, high temperature, anoxic condition, high carbon dioxide, high values of nutrients was observed. The ret liquor from the retting zone was collected and used for acute toxicity study. Etroplus maculatus were exposed to different concentrations of ret liquor under specific experimental conditions using static bioassay for 96hrs. The LC50 value of E. maculatus after 96 hrs exposure to ret liquor was found to be 70.1% which reveal the toxic impact of ret liquor.

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