First report on the anal fin deformity and other morpho-meristic deformities in Gangetic anchovy genus Thrissina from Indian waters

Gopinath, Ashly and Abdussamad, E M (2024) First report on the anal fin deformity and other morpho-meristic deformities in Gangetic anchovy genus Thrissina from Indian waters. Journal of Aquatic Biology and Fisheries, 12 (1). pp. 110-114. ISSN 2321–340X

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Abstract

Morphological and meristic irregularities were observed in nine Specimens of genus Thrissina collected from various fisheries landing centers in India. Their morphometric and meristic characters were compared with normal specimens. They were found that nine samples were abnormal in which three with the absence of a pelvic fin, two having anomalous anal fin with a reduced number of scutes, and other two with branched gill rakers and one without a pectoral fin, and one having a defect in the head region. An increased number of deformities in a particular species or population is a warning signal which indicates severe problems in their environment. Analysis of deformities appearing in many of these fish species is paving a way to find the actual limiting factor responsible for these body changes. Findings of different deformities in Thrissina species have been discussed here

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