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Effects of Cowdung Application on the Production of Mud Crab(scylla Serrata Forskal) in Brackishwater Pond

M.R. Saha
Brackishwater Station, Bangladesh Fisheries Research Institute, Khulna 9280, Bangladesh

S.U. Ahmed
Brackish:water Station, Bangladesh Fisheries Research Institute, Khulna 9280, Bangladesh

P.K. Roy
Brackish:water Station, Bangladesh Fisheries Research Institute, Khulna 9280, Bangladesh

Abstract/ Executive Summary:

A culture experiment of mud crab for 84 days was conducted in earthen pond at Brackishwater Station, Bangladesh Fisheries Research Institute, Paikgacha, Khulna. The aim of the experiment was to study the effects of cowdung application on crab production and water quality. There were three treatments as without cowdung (T₁), 500 kg cowdtmg/ha/fortnight (T₂) and 750 kg cowdtmg/ha/fortnight (T₃) with three replicates for each. The result was evaluated on the basis of growth, production, survival rate etc. The experimental months was mid April '96 to mid July '96. To maintain a good water quality, water was exchanged in every spring tide. The range of salinity during the experiment was 8-19 ppt. Trash fish and fresh shrimp head were used as feed on raw basis in every alternate week at a rate of 8% body weight of crab at the same time rice bran and wheat flour were used at a rate of 2% body weight as a source of carbohydrate. The production of T₁ , T₂ and T₃ were 720.35 kg, 862.16 kg and 669.19 kg/ha respectively. Though the effects of cowdung on production of crab is insignificant but in terms of production, survival rate and growth, the study suggest that the application of cowdung in addition to feed can be recommended for mud crab culture at a rate of 500 kg/ha/fortnight.

Keywords: Scylla serrata, Cowdung, Brackishwater

Location: Brackishwater Station, Bangladesh Fisheries Research Institute, Paikgacha, Khulna

Start Date: 00-04-1996

End Date: 00-08-1996

Program Area: Animal Health and Management

Commodity: Crab

Objectives:

To know the effects of cowdtmg as organic manure on production of mud crab and water quality of its culture environment.

Methodology:

The experiment was conducted in the brackishwater ponds of Bangladesh Fisheries Research Institute at its Paikgacha Station, Khulna. The area of each pond was 500 m². After construction of dikes and gates, the ponds were allowed for sun drying for 15 days. All the ponds were fenced by bamboo slits at about 0.5 m deep in the soil to prevent escaping and burrowing of crab. Lime was applied at a rate of 125 kg/ha in all the ponds and the ponds were filled by tidal water of nearby Kapotaksha river. Crablings were stocked in the mid April '96 at a density of 10000 /ha. To study the effects of cowdung as organic manure for culture operation of mud crab, there were three treatments with two replications of each. No organic manure was applied in T₁ which was treated as control. Organic manure was applied fortnightly at a rate of 500 kg and 750 kg/ha in T₂ and T₃ respectively. The experiment was continued for 84 days. Crablings were acclimatized in the laboratory condition for 7 days prior to stocking in the experimental pond. Water depth was maintained at 0.6-0.8 m. Water was exchanged (50%) for 3-4 days of each full and new moon throughout the experimental period. Sampling for growth performance and monitoring of water quality parameters such as water temperature, pH, salinity, transparency and dissolved oxygen were done in every week. Plankton samples were collected by using plankton net with a mesh size of 100p.m. The collected samples were preserved in 5% formalin in the field and later analyzed in the laboratory. The result was evaluated on the basis of specific growth rate, total production, survival rate etc. followed by the guide lines of European Inland Fisheries Advisory Commission. After completion of experiment, all crabs were harvested by using bait and scoop net, repeated netting followed by complete drain-out of the ponds. Comparison of treatments was carried out using one-way analysis of variance (ANOVA) and Duncan's Multiple Range Test. For comparison of mortalities among the treatment values, percent mortality was subjected to arcsin transformation and the resultant data was subjected to analysis of variance as above.

Source of Information: Bangladesh J. Fish. Res., 3(1): 49-54, 1999

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Though the effects of cowdung on production of crab is insignificant but considering growth, survival and production, the application of cowdung in addition to feed can be recommended for mud crab culture at a rate of 500 kg/ha/ fortnight.

Knowledge Management: Journal