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Preliminary Study on the Production of Common Carp Cultured in Freshwater River Cages

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

M.M. Rahman
Scientific Officer
Freshwater Station, Bangladesh Fisheries Research Institute

Abstract/ Executive Summary:

A preliminary study was conducted to assess the performance of the common carp, cultured in freshwater river of Brahmaputra cages at different stocking densities during November 2011 to March 2012.The stocking densities tested were 80, 100 and 120 fish/m³. Fish were fed a 28% protein diet at the rate of 15-5% of body weight. The result of the study showed that fish in the T₁ stocked at the rate of 80 fish/m³ resulted the best individual weight followed by T₂ and T₃. The productions of fish in T₁, T₂ and T₃ were 22.33±1.20, 19.00±0.58 and 18.00±1.15 kg/m³, respectively. The results of the present study indicated that the best individual growth and production of common carp was obtained at a density of 80 fish/m³. The results also showed that the individual mean harvesting weights were negatively correlated with stocking density. Therefore, the stocking density of 80 fish/m³is considered optimum for the rearing phase.

Keywords: Production, Common Carp, Cage

Location: Brahmaputra River, Mymensingh

Start Date: 00-11-2011

End Date: 00-03-2012

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

To optimize the suitable stocking density of common carp (C. carpio) in net cages.

Methodology:

Construction of net cages - The cages were rectangular shaped, made of iron framework and covered by high-density polyethylene net. The size of each cage was 3m³. 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. Installation 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 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. T₁, T₂ and T₃. Experimental design - The designs of experiments are as follows: Feeding - Fish in each cage were fed a 28% crude protein (Saudi-Bangla Fish Feed Company Ltd.) ration 2 times/day. Feeding rate was initially 15% of total body weight per day and was subsequently reduced to 13, 11, 9, 7 and 5% on days 30, 60, 90, 120 and 150, respectively. Feed ration was maintained based on monthly samples of fish from each cage. At monthly intervals, 100 fish from each cage were sampled. 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 150 days of culture, all fish from each cage were harvested. 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 5% level was used.

Source of Information: Int. J. Agril. Res. Innov. & Tech. 4 (1): 24-27, June, 2013; ISSN: 2224-0616

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Best individual growth and production of common carp was obtained at a density of 80 fish/m³. The results also showed that the individual mean harvesting weights were negatively correlated with stocking density. Therefore, the stocking density of 80 fish/m³is considered optimum for the rearing phase.

Knowledge Management: Journal