Observations on the biology of some sciaenid fishes from Mandapam region


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Authors

  • P Jayasankar Central Marine Fisheries Research Institute, Kochi 682 014

Abstract

Regression coefficients in the length-weight relationships in females and males in Johneiops sina,
Johnius dussumieri and Johnius macropterus showed no significant difference and common equation is
recommended in each case. In Dendrophysa russelli, separate regression equations are necessary. Relative
condition factor seems to be affected by reproductive cycle. Spawning season of./, sina, J. dussumieri and
J. macropterus extended from March to October. D. russelli seems to spawn round the year. Length at first
maturity in J. sina, D. russelli, J. dussumieri and J. macropterus was 152,144,168 and 136 mm respectively.
Monthly sex ratio departed significantly from 1:1 only in J. sina, where there was male dominance.

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Author Biography

  • P Jayasankar, Central Marine Fisheries Research Institute, Kochi 682 014
    Central Marine Fisheries Research Institute, Kochi 682 014

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Issue

Vol. 41 No. 2 (1994)

Section

Articles

License

The copyright of the articles published in Indian Journal of Fisheries vests with the Indian Council of Agricultural Research, who has the right to enter into any agreement with any organization in India or abroad engaged in reprography, photocopying, storage and dissemination of information contained in these journals. The Council has no objection in using the material, provided the information is being utilized for academic purpose but not for commercial use. Due credit line should be given to the ICAR where information will be utilized.

How to Cite

Jayasankar, P. (2011). Observations on the biology of some sciaenid fishes from Mandapam region. Indian Journal of Fisheries, 41(2), 80-86. https://epubs.icar.org.in/index.php/IJF/article/view/10150