Toxicity of Decamethrin on haematology profile of climbing perch Anabas testudineus (Bloch.)

The present investigation was undertaken to study the chronic toxic effects of a sublethal concentration (0.08 ppm) of decamethrin on the haematological profile of Anabas testudineus over an exposure period of 20 days. The treated fish exhibited several behavioural responses, including loss of natural coloration, turning almost reddish in colour, loss of equilibrium, and jerky movements before death.

The treated group also showed significant alterations in the haematological profile, with decreases observed in haemoglobin (Hb), red blood cell (RBC), and white blood cell (WBC) counts. In contrast, differential leukocyte count (DLC) parameters such as neutrophils, monocytes, and esinophils showed increased values.

These findings indicate that decamethrin exerts adverse chronic toxic effects on fish health. Therefore, it is suggested that maintaining decamethrin concentration below 0.08 mg/L in water is more suitable for the culture of Anabas testudineus to ensure optimum growth performance and survival rate compared to higher concentrations.

Anabas testudineus, decamethrin, insecticide, haematology profile, pyrethroid.

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