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Biological Aspects of Barbonymus Gonionotus (bleeker, 1849) in the Padma River, Bangladesh

Saleha Jasmine
Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi, Bangladesh

Momotaz Begum
Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi, Bangladesh

Abstract/ Executive Summary:

The present study describe the biological aspects of Barbonymus gonionotus including- sex ratio, ovarian maturity, spawning season and fecundity from the Padma River, Bangladesh. Sampling was done, using traditional fishing gears i.e., cast net, square lift net and gill net during January 2011 to December 2012. For each individual total length was measured to the nearest 0.1 cm using digital slide calipers and whole body weight and gonadal weight were taken using an electronic balance with 0.01 g accuracy. A total of 1440 specimens of B. gonionotus were collected, of which 634 were males and 806 were females and sex ratio was recorded as 1:1.27. The number of females was higher than that of males. During the study a total 5 gonadal stages were examined for both males and females. Spawning season ranged from April to July and peak spawning season was June for B. gonionotus in the Padma River. The fecundity of B. gonionotus varied from 13192 to 98325 with a mean value of 58660 - 29288. The results of this study would be very beneficial for fishery biologists and may effective for sustainable management and conservation of this fish species in the Padma River of Bangladesh and surrounding ecosystems.

Keywords: Barbonymus gonionotus, Gonadal maturation, Spawning season, Fecundity

Location: Different part of the River Padma in Rajshahi region

Start Date: 00-01-2011

End Date: 00-12-2012

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

Only a few studies on length-weight relationship, stocking density and survivability, for this species has been conducted. Even though a few studies have been done on sex ratio, length frequency distribution, length-weight relationships, condition and form factor of several fish species from the region, but there are no detailed and sound studies on biological aspects of B. gonionotus from Bangladesh. Therefore, the aim of this study is to report on reproductive biology of B. gonionotus from the Padma River of Bangladesh for sustainable management and conservation in the natural water body

Methodology:

2.1 Study site This study was conducted in the Padma River (Lat. 24^o 22'; Long. 88^o 35') northwestern Bangladesh. This river is considered an important feeding and spawning ground for freshwater fish species of northwestern Bangladesh.

2.2 Sampling and laboratory analysis A total of 1440 individuals of B. gonionotus were collected from the commercial fishers catch in different part of the River in Rajshahi region during January 2011 to December 2012. Fishes were caught using different types of traditional fishing gears including cast, square lift and gill nets. The fresh samples were immediately chilled in ice upon capture, and then preserved in 10% buffered formalin solution in the laboratory. Fish were sexed by observing their gonads under a microscope. Individual lengths including total length (TL) was measured to the nearest 0.1 cm using digital slide calipers and whole body weight (BW) and gonadal weight (GW) were measured using an electronic balance with 0.01 g accuracy. Stages of ovarian maturity were examined by the method of visual examination based on color, texture, size, shape and extent of occupancy of gonads. Spawning season was calculated based on monthly variations of gravid female and gonadosomatic index (GSI). The GSI was calculated by the following formula-

GSI (%) = 100 x GW / BW

Where GW = Gonad weight; BW = Body weight

For the estimation of fecundity, the ovary was firstly weighted. Then three sub-samples were taken from the front, mid and rear-section of the ovary and weighed. The total number of eggs in each sub-sample was counted. 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 = (Gonadweight x number of egg sin the sub-sample) / sub-sample weight

Later, by taking the mean number of three sub-samples (F₁, F₂ and F₃), the individual fecundity for each female fish was calculated by the following equation:

F_e = F₁ + F₂ + F₃ / 3

2.3 Statistical analysis Statistical analyses were performed using Graph Pad Prism 6.5 software. All statistical analyses were considered significant at 5% (p<0.05).

Source of Information: International Journal of Fisheries and Aquatic Studies 2016; 4(5): 661-665

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present study describes the biological aspects for B. gonionotus including sex ratio, gonadal maturation, spawning season and fecundity from the Padma River, Bangladesh. The findings of this study would be an effective tool for fishery managers, biologists, and conservationists to initiate sustainable management strategies and regulations for proper management of the remaining stocks of this species in the Padma River and adjoining ecosystems. Also this study will be used as baseline for further study.

Knowledge Management: Journal