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The Fecundity of Hilsa Ilisha from the River Padma Near Godagari of Rajshahi District

Mst. Arifa Akter
Department of Zoology, University of Rajshahi, Rajshahi

M.D. Hossain
Department of Fisheries, University of Rajshahi, Rajshahi

M. Kabil Hossain
Department of Fisheries, Ministry of Fisheries and Livestock

R. Afza
Department of Zoology, University of Rajshahi, Rajshahi

A. S. Bhuyian
Department of Zoology, University of Rajshahi, Rajshahi

Abstract/ Executive Summary:

The fecundity of Hilsa ilisha (Hamilton, 1822) were estimated from 20 fully matured females caught from the Padma river near Godagari, Rajshahi and collected from different fish market of Rajshahi City from June to October 2002. The fecundity (F) was found to vary from 5,58,700 to 18,67,000, mean 1239360.35 ± 405068.97 for the fishes with 350-557mm in total length and mean 455.25± 59.94mm and with 600 -1775g in total body weight and mean 1181.85± 356.12g. The co-efficient of correlation for F/TL, F/TW, F/GL and F/GW were 0.8036, 0.8853, 0.7606 and 0.7922 respectively. The regression line for the TL, TW, GL and GW of the sample fishes were found to be linear when they were plotted against their fecundity. All the variables observed (P<0.05) where highly significant . The best indicator of the fecundity of H. ilisha was found to be the total body weight.

Keywords: Fecundity, Gonad, GSI, Hilsa

Location: Godagari, Rajshahi.

Start Date: 00-06-2002

End Date: 00-10-2002

Program Area: Animal Health and Management

Commodity: Hilsa

Objectives:

To know the fecundity of Hilsa ilisha in order to estimate the range and the average number of ova laid by individual female during the breeding season and
To establish a mathematical relationship of the fecundity (F) with total length (TL), total weight (TW), gonadal length (GL) and gonadal weight (GW).

Methodology:

A total of 20 fully matured females of Hilsa caught from the river Padma near Godagari of Rajshahi district and from Rajshahi fish markets (Katakhali Bazar, Shaheb Bazar and Laxmipur Bazar) from June to October, 2002 for the determination of fecundity and gonadal weight in relationship to other parameters. Eye observation and common experience were used in identifying the gravid females. Enlarged abdomen of the female fish was easily distinguished as gravid one. For detail study of fecundity the collected fishes were carried immediately to the laboratory of Department of Zoology, University of Rajshahi. After through wash with tap water the total length of each fish was measured with a measuring scale to the nearest millimeter and the body weight in gram by an electronic balance. Excess water from fishes was removed with blotting paper before measuring the weight of fishes. The gonads (GSI) were dissected out and weighed. Gonado Somatic Index was measured as gonad weight divided by total weight multiplied by hundred. Two lobes of the ovary from each sample fish were removed carefully by dissecting out the abdomen and placed in 5% formalin. It helped to preserve the ovary as well as made it much easier to separate the eggs from the ovarian wall. The stage of the ovary and the colour were noted. The two lobes of each ovary were dried off removing of excess moisture with blotting paper. Three cross sectional samples were taken from anterior, middle and posterior portion of the two lobes of each ovary. The eggs in each of the three sections were counted and then the mean number of eggs was calculated. For the estimation of fecundity from the ovarian eggs gravimetric method was applied. Using this method the eggs of three samples from both the ovaries of each Hilsa fish were counted. The number of eggs per 0.10g was computed from three samples and the total number of eggs for each fish was calculated from the sample unit average. To establish a mathematical relationship with fecundity, the total length, standard length, body weight and gonadal weight of fish were estimated. The G.S.I and egg diameter were also estimated. To establish the relationship, the values of regression co-efficient (b), point of intercepts (a) and co-efficient of correlations (r) and standard deviation were Calculated on those parameters by the least square method. ‘T’ test was done for testing the significance of co-efficient of correlation (r) were calculated on those parameters by the least square method.

Source of Information: Univ. j. zool. Rajshahi Univ. Vol. 26, 2007. pp. 41-44 ISSN 1023-6104

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The fecundity (F) was found to vary from 5,58,700 to 18,67,000, mean 1239360.35 ± 405068.97 for the fishes with 350-557mm in total length and mean 455.25± 59.94mm and with 600 -1775g in total body weight and mean 1181.85± 356.12g. The best indicator of the fecundity of H. ilisha was found to be the total body weight.

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