NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Experimental Biology (IJEB) >
IJEB Vol.50 [2012] >
IJEB Vol.50(06) [June 2012] >


Title: Effects of glucocorticoids on plasma levels of thyroid hormones (T4 and T3) and testicular activity in catfish, Clarias gariepinus during different phases of annual breeding cycle
Authors: Suchiang, P
Varkey, S
Gupta, B B P
Keywords: Breeding phase
Corticosteroids
Fish
Testis
Thyroid hormones
Issue Date: Jun-2012
Publisher: NISCAIR-CSIR, India
Abstract: Effects of short-term administration of corticosterone and cortisol on plasma levels of thyroid hormones, gonado-somatic index and testicular histology have been reported in catfish, Clarias gariepinus during different phases of its breeding cycle. Corticosterone administration had no significant effect on plasma levels of T4, T3 and T3/T4 ratio, irrespective of doses and phases of breeding cycle. However, 5 µg dose of cortisol significantly increased plasma levels of T3 and the T3/T4 ratio during quiescent and regressive phases, while it significantly decreased plasma levels of T4 during progressive phase. During breeding phase, 2 µg and 5 µg doses of cortisol significantly decreased plasma levels of T4 and T3, respectively, while 5 µg dose of cortisol alone reduced T3/T4 ratio. Irrespective of phases of annual breeding cycle and doses, short-term administration of corticosterone and cortisol had no significant effect either on GSI or testicular histology. These findings suggest that corticosterone is ineffective in stimulating plasma levels of thyroid hormones, while cortisol, depending on dose and phase/season, may differentially increase, decrease or have no effect on plasma levels of thyroid hormones in C. gariepinus.
Page(s): 398-403
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-1009 (Online); 0019-5189 (Print)
Source:IJEB Vol.50(06) [June 2012]

Files in This Item:

File Description SizeFormat
IJEB 50(6) 398-403.pdf74.73 kBAdobe PDFView/Open
 Current Page Visits: 351 
Recommend this item

 

National Knowledge Resources Consortium |  NISCAIR Website |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2012 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 511897 since 06-Feb-2009  Last updated on 21-Apr-2014Webmaster: nopr@niscair.res.in