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.
The calorific values (Total and K. cal/g dry weight), moisture, protein and ash content in relation to sex and body weight were studied in Macrognathus aculeatum (Bloch). With unit increase in body weight the total calorific values, moisture, protein and ash content increased by powers of 0.720, 0.969, 0.876 and 1.376 respectively. The females showed higher calorific value (4.320 K.cal/g) than that of males (4.052 K.cal/g).