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VOL. 9, ISSUE 6 (2024)
Comparative studies on the physiology of Bagrid cat fish, Mystus cavasius in Tunga and Bhadra rivers, Karnataka
Authors
H M Ashashree, B R Kiran
Abstract
The present study deals with the comparative study on physiology (GSI,
HSI, protein content of ovary, testis and liver ) of Mystus cavasius in
Tunga and Bhadra rivers, Karnataka was studied during July to October 2017. In
Tunga river, the GSI values increases was almost linear during September there
was marked fall in GSI value and continued to be low during remain period. The
GSI value is maximum in August and September indicates that for is engaged in
spawning activity from August to September. Higher values of HSI was found in October
and minimum during July. The HSI value is more in male than find then also
observed his was high at beginning of the gonadal development their after the
value decreased to low level in mature stage. Monthly variation in protein
content of the testies and ovary shows the inverse relationship in both the
rivers i.e. increases the protein content in testes and over as during in July
on the contain the liver and muscle protein decreases during July indicates
their inverse relationship. The protein content in ovary, muscle and liver is
more in female compared to male testis, muscle and liver. The biochemical
contents are higher in females because they contain large weight and length
than male. In Bhadra river, GSI value was maximum in July for female and
October for male and minimum in August for males and October for females.
Higher values of HSI was found during the resting and preparatory month of July
in both the sexes. The minimum HSI was found during September (Female) and
October (Male) months. The HSI value is more in male than female due to beginning
of the gonadal development their after the value decreased to low level in
mature stage. In males, protein content in liver, testes and muscles ranged
from 1.10-1.41, 1.03-1.99 and 2.20-4.14. However, in females protein content in
liver, testes and muscles ranged 1.21-1.31, 1.07-1.93 and 3.45-5.53. GSI and
HSI varies during the reproductive cycles. Liver is strongly correlated to
vitellogenic activity. Changes in the HSI indicates that liver undergo more or
less parallel changes in weight. HSI and GSI also exhibit that the liver
supports to spermatogenic and organic activity.
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Pages:11-17
How to cite this article:
H M Ashashree, B R Kiran "Comparative studies on the physiology of Bagrid cat fish, <i>Mystus cavasius</i> in Tunga and Bhadra rivers, Karnataka". International Journal of Entomology Research, Vol 9, Issue 6, 2024, Pages 11-17
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