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Reproductive Biology of the Clupeid, Gonialosa Manmina (hamilton, 1822) from the Kaptai Lake, Bangladesh.

M. A. AZADI
Department of Zoology, University of Chittagong, Chittagong-4331, Bangladesh

A.S.M. SHARIFUR RAHMAN
Department of Zoology, University of Chittagong, Chittagong-4331, Bangladesh

Abstract/ Executive Summary:

Gonialosa manmina was found to spawn once in a year from February to July in the Kaptai Lake. The fish was found to attain sexual maturity at 80 mm total length. Sex ratio of male and female was 1:2.39 ( χ2 = 26.25, df = 1, P<0.01). Female dominated significantly over male throughout the year. Seven stages of maturity were determined on the basis of morphological characteristics of gonads and diameter of ova. Fecundity of 24 fishes ranged from 13460 eggs to 56980 eggs with a mean of 32003 ± 12612 eggs. Fecundity factor was 1882 eggs g^-1 body weight. Fecundity (F) was highly correlated (P<0.001) with total length (TL), body weight (BW), ovary length (OL) and ovary weight (OW) and the relationships were as follows: F = 1.0080 TL ^2.1648 or Log F = 0.0035 + 2.1648 Log TL (r = 0.977, t = 21.49) F = 2.8807 SL ^2.0420 or Log F = 0.4595 + 2.0420 Log SL (r = 0.958, t = 15.66) F = 5477.722 BW ^0.6332 or Log F = 3.7386 + 0.6332 Log BW (r = 0.990, t = 32.91) F = 12.516 OL ^2.2057or Log F = 1.0975 + 2.2057 Log OL (r = 0.987, t = 28.80) F = 934.544 OW ^0.5062 or Log F = 2.9706 + 0.5062 Log OW (r = 0.996, t = 52.28)

Keywords: Clupeid, Reproductive Biology, Fecundity, Sex-ratio, G. manmina, Kaptai Lake

Location: Department of Zoology, University of Chittagong, Chittagong

Start Date: 00-09-1995

End Date: 00-08-1996

Program Area: Animal Health and Management

Commodity: Aquatic animal

Objectives:

1. An investigation was undertaken to study the reproductive biology of an important clupeid, Gonialosa manmina, from the Kaptai Lake, Bangladesh.

Methodology:

For the study of reproductive biology a total of 156 specimens of G. manmina were collected monthly from September 1995 to August 1996 from the fishermen catch at Rangamati area of Kaptai Lake. For maturity studies the specimens were given a median longitudinal incision ventrally after recording their length (mm) and weight (g). After dissection the sexes were determined on the basis of gonad. The gonads were taken out carefully and their lengths and weights were measured by millimeter scale and semiautomatic table balance (Ogawa Seiki Co. Ltd. Japan) of accuracy up to 0.01g respectively. Maturity stages were determined on the basis of scale adopted by the International Council for the Exploration of the Sea. Chi-square (χ2) test was carried out to evaluate the probability of equal abundance of sexes in each length group for each month. Reproductive maturity and breeding periods were determined by the Gonadosomatic Index (GSI) and Gonadal Length Index (GLI). Gravimetric method was used for the estimation of fecundity. Relationship between fecundity (F) and total length (TL), standard length (SL), body weight (BW), ovary length (OL) and ovary weight (OW) were determined by the regression equation y = a + bx. Fecundity factor was calculated by dividing fecundity (F) by body weight (BW).

Source of Information: The Chittagong Univ. J. B. Sci.,Vol. 3(1 &2): pp. 139-148 , 2008

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

All the relationships were found to be highly significant (P<0.001) and non linear and linear in arithmetic and logarithmic scales respectively. Fecundity increased more than square of total length and ovary length but less than one exponent of body weight and ovary weight. Similar significant relationships between fecundity and total length, body weight, ovary length and ovary weight were also found in other fishes from the Kaptai Lake and other water bodies.

Knowledge Management: Journal