Ecology, Environment and Conservation Paper

Vol.06, Issue 02, 2000; Page No.(175-177)

EFFECTS OF SUBLETHAL CONCENTRATIONS OF MONOCROTOPHOS ON THE ETHOLOGICAL RESPONSES OF AN AIR-BREATHING FISH, ANABAS TESTUDINEUS (BLOCH)

M. Santhankumar, M. Balaji and K. Ramudu

Abstract

Fish behaviours are extremely sensitive to toxicants. Healthy and active specimens of Anabas testudineus exposed to the sublethal concentration (1.9 mg/L, 9.5 mg/L) of monocrotophos for 120 h showed changes in respiratory behaviour. Significant increase (P <0.05) in surfacing, ventilation rate, coughing, tail twitching and fanning behaviour was observed in pesticide exposed fish. Frequency of burst swimming also increased in monocrotophos exposed fish but significant decrease (P <0.05) in aggressive behaviour like threat was observed.

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