NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.40 [2011] >
IJMS Vol.40(5) [October 2011] >


Title: Reproductive pattern and some biological features of anadromous fish tenualosa ilisha (family: clupeidae) from Pakistan.
Authors: Panhwar, Sher Khan
Siddiqui, Ghazala
Ayub, Zarrien
Issue Date: Oct-2011
Publisher: NISCAIR-CSIR, India
Abstract: This study is the first to describe the reproductive pattern of anadroumous fish Tenualosa ilisha based on the histological examination of male and female gonads. The overall sex-ratio was close to 1:1 ratio. The five stages of oogenesis, nearly ripe, fully developed, running ripe, partially spent and spent and four distinct phases of ovarian atresis alpha, beta, gamma and delta were observed. Five stages of spermatogenesis developing, nearly ripe, ripe, partially spent and spent were identified. The male and female specimens in ripe and partially spent stages were considered to be in spawning condition. The spawning males were encountered during the period from May to October with the highest in July, August and October. While spawning females were also observed during the period from May to October, with almost all females being in spawning condition. The length-weight relationship in females of T. ilisha was nearly isometric and in males was allometric. The relationship between fecundity and other variables i.e. total length, body weight, girth and ovary weight in this species was significant. The age estimated on the basis of scales radii and length of the scales showed that the age classes comprised of 1+ to 3+ years. The mean scale length in different length groups was 7.5 to 11.5 mm.
Page(s): 687-696
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Source:IJMS Vol.40(5) [October 2011]

Files in This Item:

File Description SizeFormat
IJMS 40(5) 687-696.pdf509.82 kBAdobe PDFView/Open
 Current Page Visits: 488 
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: 576925 since 06-Feb-2009  Last updated on 03-Sep-2014Webmaster: nopr@niscair.res.in