Occurrence of Morphological Deformities in Wild Cat Fish, Clarias Batrachus, in a Natural Ecosystem of Tripura, North East India - A Possible Case of Stress Induced Polyploidy as Revealed by Erythrocyte Examination
BioAsia 2008, Queen Sirikit National Convention Center, Bangkok, Thailand, November 25-27
Posted: 10 May 2009
Date Written: November 27, 2008
Morphological deformity in fishes has been reported in various species and was attributed to various factors viz, nutritional deficiency, stressed conditions in the ecosystem and genetic factors. Polyploidy has also been reported by various workers as one of the reason in explaining the occurrence of morphological deformities in fishes and may be caused spontaneously in natural conditions to increase genetic divergence and heterozygosity in a population.
The present study reports for the first time, the occurrence of morphological deformity in some female wild Clarias batrachus in a natural ecosystem of Tripura, Northeast India (Approximate Longitude 92◦ E, Latitude 23◦ N). A deviation has been observed in these individuals from the overall length-weight characteristics as calculated by the equation log10 W= log10 a b log10 L, for the species isolated from the same ecosystem. The erythrocyte examination also suggest toward the occurrence of polyploidy in these samples. Isolation of more samples of the species with morphological deformities from their natural habitat and confirmation of their ploidy level is of utmost importance.
Keywords: Cat fish, Morphological deformity, Spontaneous triploidy, Environmental Stress
JEL Classification: Q22
Suggested Citation: Suggested Citation