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Studies on the Gonadosomatic Index and Fecundity of Mystus Gulio (ham.)

M. A. Islam
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna-9280, Bangladesh

M. Begum
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna-9280, Bangladesh

H. K. Pal
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna-9280, Bangladesh

M. J. Alam
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna-9280, Bangladesh

Abstract/ Executive Summary:

The study was conducted for a period of twelve months from January to December 2006 to determine the gonadosomatic index (GSI) and fecundity of Mystus gulio. Total 370 of Mystus gulio were examined during the study period. The sex ratio (male:female) of the investigated fish was 1:1.22 and generally female was larger than male. The fish was found to have a wide spawning season (March to November) with a single spawning peak in July as indicated by the gonadosomatic index and ova diameter. Fecundity of the fish was ranged from 3,891 to 1,68,358 with an average of 32,909.49 during the period of study and was found to increase with the increase of body length and weight. The relationships between fecundity and total-length, body-weight, gonad-length and gonad-weight were found linear and statistically highly significant (p<0.05).

Keywords: Gonado-somatic index, Fecundity, Mystus gulio

Location: Brackishwater Station, Bangladesh Fisheries Research Institute, Paikgacha, Khulna, Bangladesh

Start Date: 00-01-2006

End Date: 00-12-2006

Program Area: Animal Health and Management

Commodity: Aquatic animal

Objectives:

To detect the gonadosomatic index and fecundity of M. gulio and also to establish a relationship between the fecundity and body-length, body-weight, gonad-length and gonad-weight of the fish.

Methodology:

The experiment was conducted in Brackishwater Station, Bangladesh Fisheries Research Institute, Paikgacha, Khulna for a period of twelve months from January to December 2006. Thirty one matured fish were collected randomly during monthly sampling from brackishwater aquaculture farms to determine the total length and weight. The total 370 male and female fish were used to determine the gonadosomatic index and fecundity. The collected specimens were brought to the laboratory and they were firstly cleaned, measured and weighed. The male and female fish were separated and data were recorded after dissecting out the gonad of the individual fish. Then the ovaries and testis of fish were taken out very carefully and preserved in well labeled vials containing 5% buffered formalin for subsequent studies. Gravimetric method was followed to determine the fecundity of fish. In this case, the external connective tissues were removed from the surface of the ovaries. Moisture of the ovaries was removed with the help of blotting paper. Weight of ovaries was recorded in gram with the help of a fine electric weighing balance. Then 0.01 g of each ovary was taken separately from anterior, middle and posterior regions of each lobe. The number of matured and immature eggs for each portion were sorted out and counted with the help of a needle and magnifying glass. The mean number of eggs in 0.01 g was determined and then multiplied by the total weight of the ovary, which gave the total number of eggs i.e., the fecundity of the respective fish. Gonadosomatic index (GSI) of the male and female fish of the collected samples was determined separately by using the following formula: GSI = (Weight of gonad/Weight of fish) × 100 Ova diameter at different stages of maturity was measured with the help of ocular micrometer. In this study, 12 ova were taken randomly from the mixed sample of eggs of three portions of each ovary. Measurements of ova diameter were taken along the longest axis of the ova. Sex ratio of the collected fish was estimated. The relationship between the fecundity and total-length, body-weight, gonad-length and gonad-weight were determined with the help of a computer following MS Excel program.

Source of Information: Progress. Agric. 19(2) : 161-166, 2008 ISSN 1017-8139

Article Link (Online Journal): http://www.banglajol.info/index.php/PA/article/view/16956/11908

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From this study it was observed that M. gulio has a wide spawning season (March to November) which coincides. The study of fecundity indicated a linear relationship with total-length, body-weight, gonad-length and gonad weight of the fish. The relationship between fecundity and total length, body weight, gonad length and gonad weight were found statistically highly significant (p<0.05) which is seemed to be similar to those reported. Among the relationships, relationship between fecundity and gonad weight showed very close (r= 0.987).

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