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Growth and Production Performances of Threatened Small Indigenous Fish Gulsha (mystus Cavasius) in Cagesystem in the River Brahmaputra, Mymensingh, Bangladesh

A.H. M. Kohinoor
Senior Scientific Officer, Freshwater Station, Bangladesh Fisheries Research Institute, Mymensingh, Bangladesh.

Md. Moshiur Rahman
Scientific Officer, Freshwater Station, Bangladesh Fisheries Research Institute, Mymensingh, Bangladesh.

Abstract/ Executive Summary:

One of the important cultivable small indigenous fish which deserves immediate attention for commercial farming is the gulsha, Mystus cavasius. A preliminary study of growth and production performance of gulsha in a cage in the river Brahmaputra was carried out for a period of seven months during November 2012 to May 2013. Three treatments depending on the density of fish per cubic meter viz. 500, 600 and 700 were tested with the cage size of 3.0 m³. Fish were fed with pelleted supplementary feed (containing 30% crude protein) at the rate of 5-15% of body weight. In terms of growth and survival, relatively highest performance was found in the Treatment-1 compared to other treatments. The total production was found highest in the stocking density of the Treatment-1 (8.14 kg/m³) compared to other treatments. The total production of Treatments- 2 and 3 showed significant differences but there was no significant differences was observed in Treatment-1 and 2. However, total production in the Treatment -1 showed highest production level, which could be applicable for the farmers reducing monetary investment for fingerling and feed purchase. Overall, cage with a size of 3.0 m³, stocking higher priced Gulsha at the rate of 500/m³ setting in the river during winter season could be a noble technology for the aquaculture farmer in Bangladesh.

Keywords: Production, Gulsha, Cage, Indigenous fish, Brahmaputra River.

Location: Brahmaputra river, Mymensingh

Start Date: 25-10-2012

End Date: 18-05-2013

Program Area: Animal Health and Management

Non-commodity: Performance

Objectives:

To assess the growth and production performance of Gulsha in cage in the river Brahmaputra.

Methodology:

The experimental study of growth and production performance of Gulsha in cage in Brahmaputra river was carried out for a period of about 7 months from 25-10-2012 to 18-05-2013 crossing both winter and summer season. Experimental site -The experiment was carried out for seven months during November 2012 to May, 2013 in the Brahmaputra River at Khagdohar Ghat, Mymensingh district.Construction of net cages -The size of each cage was 3.0 m³. The cages were rectangular shaped, made of iron framework and were covered by a high density polyethylene net. The mesh size of the net was 1 cm. Iron rods were welded to construct a rectangular shape frame and nets were attached to the rod with the help of nylon twine.One edge of the side of each cage was kept open which was tied with nylon threads in such a way that it could be opened to deliver feed in the cage.Instillation of the cages -The cages were installed by several bamboo bars. The cage was fixed with bamboo poles inserted into the river bottom. The cages were tied fixed with the frame by nylon ropes at the time of suspension, about 1 feet of the upper portion of the cages were always kept above the water level. For easy management, the cages were numbered as 1 to 9 and were divided into three treatment groups viz. T-1, T-2 and T-3. Experimental Fish - Gulsha fry were used in this experiment. Fish fry were collected from Satata Matsha Hatchery & Fishery, Tarakanda, Mymensingh. All the fish were the same age group having mean weight of 1.04±0.54, 1.30±0.29 and 1.18±0.33g of T-1, T-2 and T-3, respectively. Prior to start of the experiment, the fingerlings were acclimatized to the new environment in floating cages for seven days. Then the fish were stocked in the cages according to the experimental design.Feeding -The fish species in all the treatments were fed first with prestarter feeds with 30% crude protein for the first month and starter-1 feeds with 30% crude protein on the second month then starter-2 with 30% crude protein on the 3rd month until harvest. Feeding adjustment was done every two weeks based on a feeding rate from 30% down to 8% of the average body weight. The amount of feeds used per treatment was recorded daily. Periodical sampling -The weight of fish was taken in account as an important index of growth. Hence, the sampling was done monthly twice by getting the bulk weight of 100 fish samples. Individual weight of 100 fish samples were measured on the initial and final sampling. Monitoring of water quality parameters -The water quality parameter such as temperature (°C), pH, dissolved oxygen (mg/l), transparency (inches) and ammonia (mg/l) were recorded weekly interval throughout the experimental period at 9 am to 10 am by using a water testing kit. The samples were always collected from the sub-surface of with minimum disturbance of water.Harvesting - After 210 days the cage was shifted from the culture site and brought to the land area. The fishes were harvested by hand picking. Then total number and weight of fishes were recorded and survival, production were also calculated. Data analysis - A statistical test on the treatment means was done using the procedure for randomized block design. When means were significantly different, the Duncan Multiple Range Test at the 5% level was used.

Source of Information: International Journal of Farming and Allied Sciences (IJFAS) 2(5): 180-183, 2015

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In the present study, the total production of Treatment-1 (500/m³⁾ was supposed to be high as the stocking density was less however, total production in the Treatment-1 showed highest production level due to better individual growth performance, which could be applicable for the farmers avoiding higher investment for fingerling and feed purchase. The growth and production performance of Gulsha was found satisfactory though the experimental period continued from winter to summer. This indicates the suitable temperature level in the river system during the winter for production of fish in the cage system. Such potential ecological area and season of the rivers could be brought under broader aquaculture development programme for the resource poor people who do not have their own land and ponds. Overall, cage with a size of approximately 3.0 m³, stocking higher priced Gulsha at the rate of 500- 600/m³setting in the quiet river during winter season could be a noble technology for the aquaculture farmer in Bangladesh.

Knowledge Management: Journal