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Effect of Tetrodotoxin of Puffer fish Arothron immaculatus on Oreochromis mossambica from South Andaman, Indian EEZ
Authors: Purbali Saha, *Divya Singh, S.Venu and B. Santhosh Ram
Number of views: 342
Tetradotoxin poisoning from Puffer fishes (Family Tetreaodontidae) is very common in coastal regions of Asian countries. In the present study, bioassays were conducted to investigate the toxicity of liver and ovaries of puffer fish Arothron immaculatus on Oreochromis mossambica collected from South Andaman. Various concentrations of tissue extract (0.1, 0.2 and 0.3 ml/g body weight) were introduced into the body of the fish by integrating the same in artificial pellet feed as well as through intra-peritoneal injection. The behavioral and morphological changes in fishes were recorded continuously after the introduction of extract till the time of mortality. The tissue extract produced no lethal change on O. mossambica during the feeding experiment with no mortality. The same concentration of toxin when injected intra-peritoneally was proved to be lethal for the experimental organisms triggering a sudden body color change, paralysis followed by death. The introduction of ovary extract was more fatal and the average time for color change was observed at 5.4, 3.1, 1.4 seconds and the average time of death at 93, 72, 70 seconds respectively in three concentrations. Whereas, the intra-peritoneal introduction of liver extract was more lethal as the average time of color change in 0.1, 0.2 and 0.3 ml/g was found to be 77, 87 and 59 seconds and average time of death occurred after 10.22, 4.03, 3.18 minutes respectively. The study suggests that puffer fish, Arothron immaculatus collected from the coast of South Andaman is showing more toxicity in the ovary tissue.
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