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Research Paper | Environmental Biology | India | Volume 12 Issue 6, June 2023 | Rating: 5.6 / 10

Study of Morphological and Anatomical Abnormalities in Freshwater Fish Species: An Observational Series of Case Studies

Utpal Chakraborty ^[2] | Soumendra Nath Talapatra ^[13] | Tapan Kumar Chatterjee ^[6]

Abstract: The objective was to detect abnormal external morphology related to abnormal anatomy of vital organs of two freshwater fish species Heteropneustesfossilis Bloch and Oreochromis sp., Linnaeus found in local market, West Bengal. The results show abnormal body features along with deformed caudal fins and operculum. The fish specimen (Oreochromis sp.) indicated bilobed (brown colour) liver in which longer left lobe and shorter right lobe and gills observed red coloured, asymmetrical gill filaments with many raptures while gonads (testes) observed asymmetrical, white colour, segmented and immature growth. Other fish specimen (H. fossilis) revealed that liver is trilobed (reddish brown colour) in which dorsal side appeared tumour on left lobe and right lobe connected with extra small lobe and gills observed red coloured, asymmetrical gill filaments, condensed of gill lamellae and arches while gonads (ovaries) asymmetrical, black colour and possibilities of follicular atresia and upper part of right ovary contained a tumour like or necrotic tissues. It is concluded that the abnormal morphologies lead to abnormal anatomy of liver, gills, and gonads (testes and ovaries). It is suggested further to analysis the physico - chemical parameters of the habitat especially aquatic ecosystem as well as study with other fish species.

Keywords: Fish species, Freshwater fish, Morphological abnormalities, Anatomical anomalies; Vital organs

Edition: Volume 12 Issue 6, June 2023,

Pages: 256 - 261