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Reproductive pattern and some biological features of anadromous fish <i style="">tenualosa ilisha</i> (family: clupeidae) from Pakistan.

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Title Reproductive pattern and some biological features of anadromous fish tenualosa ilisha (family: clupeidae) from Pakistan.
 
Creator Panhwar, Sher Khan
Siddiqui, Ghazala
Ayub, Zarrien
 
Description 687-696
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.
 
Date 2011-11-18T04:30:31Z
2011-11-18T04:30:31Z
2011-10
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/13081
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.40(5) [October 2011]