Concerted efforts are currently being made to increase fish production just as attempts are also
made to increase crop production through intensive agricultural practices. The latter has resulted in
a large-scale use of herbicides/pesticides such as Gramoxone which is increasing daily (Mason,
1983). Although there are definite advantages in the use of pesticides for increased of crop yield,
their indiscriminate use has been identified as a cause for many previously unexplained fish kills as a
result of run-off effluents diverted into fish habitats (Oloruntuyi et al., 1992; Palanichamy et al.,
1989). Pesticides usually find ways into the aquatic environment either by accident or by delebrate
application into water bodies. Accidental introduction include the run-off in water from treated
land, spray drift during treatment, washing of spraying equipments in waterways and from the air.
The delibrate application may be used to control weeds, intermediate host of human and animal
diseases, protect aquatic crops and the elimination of unwanted fish (Nair et al., 1985).