Pollutional Potency of the Insecticide, Bayrusil with Respect to Mortality and Behaviour of Heteropneustes fossilis (Bloch)

The paper deals with the effect of an agro-chemical, Bayrusil on the mortality and behaviour of a catfish Heteropneustes fossilis. It was inferred from the experiment that 38.0 and 41.0 ppm of the insecticide represented LC₅₀ and LC₁₀₀ doses respectively showing acutely toxic nature of the pesticide. Some remarkable changes were also observed in the fish in pesticidal media, such as thrilling and bending of body, jerky movement, surfacing and gulping air, dashing against the wall of container, frequent jumping, loss of balance, muscular weakness and finally death.