COMPARATIVE MORPHOMETRIC ANALYSIS OF VERTEBRAE AND EXTERNAL MORPHOLOGY IN DEFORMED FISH SPECIMENS: AN OBSERVATIONAL SERIES OF CASE STUDIES

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Utpal Chakraborty
Tapan Kumar Chatterjee
Soumendra Nath Talapatra

Abstract

The fish specimens sometimes are observed with abnormal morphological features, which may lead to vertebral
deformities, and is the symptom of a teratogenic effect. The present study was attempted to perform comparative
morphometric analysis of freshwater fish Labeo rohita (Hamilton-Buchanan) to identify the external morphology and
vertebral structure compared to normal features. The morphometric analysis, especially external morphology and
vertebral column deformities were studied on three abnormal specimens and one normal specimen of L. rohita. The
morphological features viz. head length (HL), head width (HW), body length (BL), body width central position (BW),
caudal fin length (CFL) and caudal fin width (CFW) were measured manually. For vertebral deformities study,
radiographs were taken to know bone structure especially vertebrae and further measurements viz. angle (in degree),
length (cms) and numbers were performed by using ImageJ tool (version, 1.49). Among 4 specimens, normal fish was
found without any morphological and vertebral deformities while 3 specimens were observed abnormal morphology like
tail bulging and bending, the truncated body as well as vertebral deformities especially scoliosis (bending dorsally),
kyphosis (calcification) and lordosis (bending ventrally) and fused in the caudal vertebrae, which were confirmed with the
3D interactive surface plot. In conclusion, this observational study is indicated suitable information on the morphometric
analysis in the L. rohita, but the cause of deformities is unknown. In future, it is suggested to recover these abnormalities
concerning specific factors like genetic, abiotic, nutritive, etc. that can be prevented the economic loss because fish is an
important diet.

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How to Cite
Chakraborty, U., Chatterjee, T., & Talapatra, S. (2021). COMPARATIVE MORPHOMETRIC ANALYSIS OF VERTEBRAE AND EXTERNAL MORPHOLOGY IN DEFORMED FISH SPECIMENS: AN OBSERVATIONAL SERIES OF CASE STUDIES . Journal of Advanced Scientific Research, 12(02 Suppl 1), 140-144. https://doi.org/10.55218/JASR.s12021122sup129
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Research Article