TOXICITY AND BEHAVIOURAL RESPONSE OF THE FISH CHANNA PUNCTATUS (BLOCH) AT DIFFERENT CONCENTRATIONS OF WEEDICIDE (AQUATHOL) DURING STATIC ACUTE BIOASSAYS
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The present work is an endeavour to study the toxicity and behavioural responses of the fish Channa punctatus (Bloch) at different concentrations of a weedicide (Aquathol or Endothal) during static acute bioassays. The TLm or LC50 values were computed to be 3.162, 2.405, 2.290 and 1.550 mg/I at 31.0±1.00C respectively for 24, 48, 72 and 96 hrs exposures of aquathol. The safe concentration value was computed to be 0.418 mg/I at this temperature. The behavioural response of Channa punctatus (Bloch) was grossly depenent on the concentration and length of exposure.