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Study on the Fecundity Indices of Two Indigenous Fish Species from the Padma River

M.A.B. Siddique
Department of Fisheries, University of Rajshahi, Rajshahi

A.N.G.M. Hasan
Department of Fisheries, University of Rajshahi, Rajshahi

A.B.M.S. Islam
Department of Fisheries, University of Rajshahi, Rajshahi

M.H. Ali
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh

M.S. Hossain
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

Aspects on the fecundity indices of Gudusia chapra and Mystus vittatus of the Padma River were studied during March to August 2006. A total of 660 specimens, representing two species off two families used for the study were caught by traditional fishing gear. For the estimation of fecundity the gravimetric method was used. The mean total fecundity of G. chapra was 20160±6545 and M. vittatus was 12180±5812. However in August the total fecundity, standard length (SL) and body weight (BW) was greater than in March. The relationships between fecundity and morphometric measurements indicated that the body weight and fecundity was related isometrically with female body size.

Keywords: Study, Fecundity indices, Iindigenous fish species, Padma River

Location: Padma River at Rajshahi

Start Date: 00-03-2006

End Date: 00-08-2006

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

1. To determine the fecundity of these species from Padma River.

Methodology:

Sampling and Laboratory Analysis - The present study was conducted in the Padma River at Rajshahi. This study on fecundity of G. chapra and M. vittatus were conducted using samples collected during day time from the fishermen catch landed at the Rajshahi city, Rajshahi, Bangladesh from March to August 2006. These fishes were caught by means of traditional fishing gear jhaki jal (cast net), tar jal (square lift net), and dughair (conical trap). The sample was immediately preserved with ice in the fish market and fixed with 5% formalin on arrival in the laboratory. All specimens were sexed by gonad observation under a binocular microscope and only female specimens were used for this study. For each individual, standard length (SL) was measured, and whole body weight (BW) was taken on a digital balance with 0.01g accuracy. Whole gonad was removed from each female fish and weighed (GW) with balance to an accuracy of 0.001g and was preserved by 10% formalin. Estimation of Fecundity - The specimen larger than first size at sexual maturity was used for the estimation of fecundity during this study. For the estimation of fecundity, the ovaries were weighed; three sub-samples were taken from the front, mid and rear-section of each ovary and weighed. The total number of eggs in each sub-sample ovary was calculated. This value was proportional to the total ovary weight; the number of eggs (F₁) for the sub-sample was estimated by using the following equation: F₁= (gonudweight x number of eggin the sub-sample)/sub-sample weight. Later, by taking the mean number of three sub-sample fecundities (F₁, F₂ and F3), the individual fecundity for each female fish was calculated by the following equation: F₀ = (F₁ + F₂ +F₃)/3. The relationship between fecundity and some morphometric measurements were determined by relating total fecundity (F₀) data to standard length (SL) and total weight (BW) using the following formulae: In F₀= ln m + n × ln SL; Fe = m × SLⁿ ; In F₀= ln m + n × ln BW; Fe = m × BWⁿ Here, m and n are constant parameter in the linear regression analysis and ln is the natural logarithm.

Source of Information: J. Agrofor. Environ. 2(2): 71-74, 2008; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The study has provided some basic information on the size at sexual maturity and fecundity for G. chapra and M. vittatus that will be helpful to evaluate reproductive potential of individual fish species in similar studies. Further, it would be useful for fishery biologist/manager to impose adequate regulation for sustainable fishery management for the control of exploiting fishing of young individuals and when associated with other information aids in evaluation and prediction of fish stock in the Padma River and nearby areas of Bangladesh.

Knowledge Management: Journal