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Reproductive Biology of Mystus Vittatus (bloch, 1794) in the Padma River, Bangladesh

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

Mahbub Ara Molina
Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi, Bangladesh

Abstract/ Executive Summary:

The aim of this study is to present the reproductive biology of Mystus vittatus including- sex ratio, gonadal maturation, spawning season and fecundity from the Padma River, Bangladesh. Fish samples were collected using different types of traditional fishing gears i.e., cast net, square lift net and gill net during June 2010 to May 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. During the study, total 2875 specimens of M. vittatus were collected where, 48.66% were males and 51.34% were females and the overall sex ratio was recorded as 1:1.05 (male: female). A total of 350 gravid female fishes were studied to determine different stages of ovaries and a total of 8 stages of ovaries were examined. Based on percentages of gravid females and monthly variations of gonadosomatic index (GSI), the spawning season was ranged from March to September and peak spawning season was June for M. vittatus in the Padma River. During the study fecundity for M. vittatus varied from 6023 to 29800 with a mean value of 14751 - 7539. The results of this study would be an effective tool for fishery managers, biologists, and conservationists to initiate appropriate management strategies and regulations for the sustainable management of this species in the Padma River and surrounding ecosystems.

Keywords: Mystus vittatus, Sex ratio, Maturation stages, Spawning period, Fecundity

Location: Padma River, Bangladesh

Start Date: 00-06-2010

End Date: 00-05-2012

Program Area: Animal Health and Management

Commodity: Cat fish

Objectives:

Reproduction is influenced by several factors such as differentiations in genetic combination, day light, temperature, turbidity, depth of water and availability of food. Various studies on morphometric relationships , conditions and first maturity for many threatened species from Bangladesh are well documented. But there is no study on reproductive biology for M. vittatus. Therefore, the aim of this study is to present the reproductive biology of M. vittatus from the Padma River of Bangladesh for sustainable management strategies.

Methodology:

2.1 Study site This present 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 The samples were collected from the commercial fishers in different locations (Charghat; 24°15' N, 88° 44' E; Saheb bazar; 24° 20' N, 88° 34' E and Godagari; 24° 26' N, 88° 19' E) of the Padma River in Rajshahi region during June 2010 to May 2012, using different types of traditional fishing gears i. e., cast net (mesh size 1.5 – 2.0 cm), square lift net (mesh size ~1.5) and gill net (mesh size 1.8 – 2.2 cm). The collected samples were instantly iced in site, and then preserved in 10% alcohol solution for further study in the laboratory. Fish were sexed by microscopic observation of gonad. For each individual total length (TL) was measured to the nearest 0.1 cm using slide calipers and whole body weight (BW), gonadal weight (GW) were taken by an electronic balance with the accuracy of 0.01 g. Maturation stages of ovary were confirmed by visual assessment of color, texture, shape and size of gonads. On the basis of monthly variations of gravid female and gonadosomatic index (GSI) the spawning season was determined. The GSI was deliberated by the following method- GSI (%) = 100 x GW / BW

Where, GW = weight of gonad; BW = body weight

Source of Information: International Journal of Fisheries and Aquatic Studies 2016; 4(5): 666-669

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present study describes the reproductive biology of M. vittatus including sex ratio, gonadal maturation, spawning season and fecundity from the Padma River. The results of this study would be an effective tool for fishery managers, biologists, and conservationists to initiate proactive management strategies and regulations for the sustainable management of the remaining stocks of this species in the Padma River and surrounding ecosystems.

Knowledge Management: Journal