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Studies on the Gonadosomatic Index and Fecundity of Chapila (gudusia Chapra Ham.)

A.K.M.A. Kabir
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh- 2202, Bangladesh

M.S. Islam
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh- 2202, Bangladesh

S. Dewan
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh- 2202, Bangladesh

M.A. Hossain
Bangladesh Fisheries Research Institute, Mymensingh-2201

S.M. Rahmatullah
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh- 2202, Bangladesh

Abstract/ Executive Summary:

The study was conducted in pond to determine the fecundity and gonadosomatic index of chapila, Gudusia chapra. The male fish was found to attain sexual maturity at 7.7 em and 7.41 g and that of the female at 9.3 em and 14.65 g by standard-length and body-weight respectively. The investigated fishes were found to be male and female at the ratio of 1 :3 and generally female was found to be larger than male. The fish was found to spawn for several months with two spawning peaks, one in April and another in August as indicated by the peaks of gonadosomatic index and ova diameter. Fecundity of the fish ranged from 25,220 to 154,528 with an average value of 72,383 and was found to increase with the increase in length and weight of the fish. The relationships between fecundity and standard-length, body-weight, gonad-length and gonadweight of the fish were found to be linear and significant.

Keywords: Gudusia chapra, Fecundity, Gonadosomatic index

Location: BAU

Start Date: 00-03-1995

End Date: 00-09-1995

Program Area: Animal Health and Management

Non-commodity: Management

Objectives:

To determine the fecundity and gonadosomatic index of chapila and also to establish a relationship between the fecundity and standard length, body weight, gonadal length and gonadal weight of the fish.

Methodology:

The experiment was conducted for a period of seven months from March to September'95 in three earthen ponds each covering an area of 800 m² and with an average depth of 1.5 m. Twenty matured fishes were collected randomly during each sampling from the ponds to determine the standard length and body weight. The male and female fishes were differentiated and data were recorded after dissecting out the gonad of the individual fish, Then the ovary and testis of each fish was taken out very carefully and preserved in a well labeled vial containing 5% buffered formalin for subsequent studies. Gravimetric method was used to determine the fecundity of fish. In using this method, the external connective tissues were removed from the surface of ovaries. Moisture of the ovaries was removed with the help of a blotting paper. Weight of the ovaries of each fish so treated was recorded in gram with the help of a fine electric weighing balance. Then 0.01 g of each ovary were taken separately from anterior, middle and posterior portions of each lobe. The number of matured and immature eggs for each portion were sorted out separately and counted. 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 respective fish. Gonadosomatic index (GSI) of the male and female fishes of the collected samples were determined separately by using a formula. Diameter of the eggs at different stages of maturity was measured with the help of an objective 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 fishes was estimated. The relationship between fecundity and standard length, body-weight, gonad-length and gonad-weight were determined with the help of a computer following SPSS program.

Source of Information: Bangladesh J. Fish. Res., 2(2): 195-200, 1998

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The male fish was found to attain sexual maturity at 7.7 cm and 7.41 g and that of the female at 9.3 em and 14.65 g by standard-length and body-weight respectively. The investigated fishes were found to be male and female at the ratio of 1 :3 and generally female was found to be larger than male. The fish was found to spawn for several months with two spawning peaks, one in April and another in August as indicated by the peaks of gonadosomatic index and ova diameter. Fecundity of the fish ranged from 25,220 to 154,528 with an average value of 72,383 and was found to increase with the increase in length and weight of the fish. The relationships between fecundity and standard-length, body-weight, gonad-length and gonadweight of the fish were found to be linear and significant.

Knowledge Management: Journal