Thyroid hormones dynamics during early development in freshwater catfish, Heteropneustes fossilis (Bloch)


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Authors

  • P K Nayak Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar -751 002
  • B B Satpathy Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar -751 002
  • T K Mishra Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar -751 002
  • S Ayyappan Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar -751 002

Abstract

Changes in the concentrations of thyroid hormones in the eggs, embryonicdevelopment and larvae of fi-eshwater catfish (Heteropneustes fossilis) were analyzedusing radioimmimoassay. Results showed that both thyroxin(T^) and triiodothyronineCTg)were present in significant quantities in fertilized eggs. There was a steady decrease inboth T^ and Tg levels during embryonic development. The level continued to decline afterhatching until around third day, when most of the yolk had been absorbed. The T^ levelstarted increasing prior to completion of yolk absorption, suggesting that the larvalthjToid gland had begun to produce T^ (onset of thyroxinogenesis). The hormoneconcentration increased further in 17-day old larvae, which coincided with the metamorphictransformation of larvae to juveniles (19-21 days post larvae), indicating role of thyroidhormones in metamorphic transformation of freshwater catfish, //. fossilis

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Author Biographies

  • P K Nayak, Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar -751 002
    Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar -751 002
  • B B Satpathy, Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar -751 002

    Central Institute of Freshwater Aquaculture,

    Kausalyaganga, Bhubaneswar -751 002

  • T K Mishra, Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar -751 002
    Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar -751 002
  • S Ayyappan, Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar -751 002
    Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar -751 002

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Issue

Vol. 48 No. 4 (2001)

Section

Articles

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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

Nayak, P. K., Satpathy, B. B., Mishra, T. K., & Ayyappan, S. (2011). Thyroid hormones dynamics during early development in freshwater catfish, Heteropneustes fossilis (Bloch). Indian Journal of Fisheries, 48(4), 403-408. https://epubs.icar.org.in/index.php/IJF/article/view/8389