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Feasibility of Bi-culture of Mud Crab (scylla Serrata) and Shrimp (penaeus Monodon)

M. Begum
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna 9280, Bangladesh

M.J. Alam
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna 9280, Bangladesh

Abdullah-Al Mamun
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna 9280, Bangladesh

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

Abstract/ Executive Summary:

A study on the feasibility of bi-culture of mud crab (Scylla serrata) and shrimp (Penaeus ?monodon) in brackishwater earthen ponds (0.1 ha each) was carried out for a period of five months (March-August). Nursed shrimp juvenile (ABL:· 3.36±0.23 cm and ABW: 0.26±0.04 g) and crab juvenile (ACL: 2.61±0.22 cm, ACW: 4.63±0.11 cm and ABW: 43±2.64 g) were stocked following the experimental design of shrimp 2/m² (Treatment-1), shrimp 2/m² and mud crab 1/m² (Treatment-2) and shrimp 2/m² and mud crab 0.5/m² (Treatment-3). Crabs were fed with chopped trash tilapia @ 10~5%, while shrimp were fed with Saudi-Bangla shrimp feed @ 3~5% of biomass twice daily. Significantly (p<0.05) higher specific growth rate (SGR) of shrimp and mud crab was 1.86% (g/day) in T₂ and 0.83% (g/day) in T₃ respectively. The survival of shrimp and mud crab also varied significantly (p<0.05) with a higher mean value of74.63% in T₁ and 51.04% in T₃, respectively. The production of shrimp (424.09 kg/ha) was significantly (p<0.05) higher in T₁ and that of mud crab (568.80 kg/ha) in T₂. Significantly (p<0.05) highest total production of 871.29 kg/ha was in T₂ followed by 708.52 kg/ha in T₃ and 424.09 kg/ha in T₁. The results indicate that mud crab can be cultured at a stocking rate of 1/m² together with shrimp at 2/m²^.

Keywords: Mud crab, Tiger shrimp, Bi-culture

Location: Bangladesh Fisheries Research Institute (BFRI), Brackish water Station, Paikgacha

Start Date: 00-03-2007

End Date: 00-08-2007

Program Area: Animal Health and Management

Commodity: Crab

Objectives:

1. To determine the growth, survival and production performance of mud crab, S. serrata and shrimp (P. monodon) in a bi-culture system.

Methodology:

The experiment was conducted in the earthen ponds of Bangladesh Fisheries Research Institute (BFRI), Brackish water Station, Paikgacha, Khulna from the period of March-August 2007. Nine ponds having an area of 0.1 ha each were prepared through sun drying and liming the bottom soil with agricultural lime @ 250 kg/ha and mustard oil cake @ 500 kg/ha. The insides of pond embankment one meter apart from the edge of water were encircled with bamboo split-made fence so that crabs could not be able to escape in any way. The ponds were filled in with tidal water up to a depth of 1 m and inorganic fertilizers of TSP and urea were applied @ 35 kg/h with 3:1 ratio. After 10 days of fertilization, shrimp (P. monodon) juvenile (ABW: 0.26±0.04 g) that were nursed in hapa nursery system and juvenile of crab (ACL: 2.61±0.22 cm, ACW: 4.63±0.11 cm and ABW: 43±2.64 g), which were collected from the Sundarbans mangrove area through fishermen, were stocked in the ponds following different stocking patterns of (i) shrimp 21m² (Treatment-1), (ii) shrimp 21m²and mud crab 11m² (Treatment-2) and (iii) shrimp 21m² and mud cr.ab 0.51m² (Treatment-3). Each treatment had three replications and those were assigned into a completely randomized design. Prior to stocking crabs were acclimatized for about 30 minutes and the male female ratio at each stocking density was Male: Female 1:9. The juvenile crabs were fed twice a day with tilapia fish @ 5~ 10% and shrimps were fed with Saudi-Bangla shrimp feed @ 3-5% of the biomass. About 50% of water was exchanged with tidal water at every new and full moon throughout the experimental period. Growth performance of crabs in respect of carapace ·width (CW), body weight (BW) and that of shrimp in respect of body length (BL) and body weight (BW) were recorded fortnightly. Physico-chemical parameters of pond water, viz., temperature, transparency, salinity, pH, and dissolved oxygen were also recorded fortnightly following standard measurement procedures. After four months of rearing shrimps were harvested by cast netting and after five months, crabs were harvested, along with any left over shrimp, by draining out the pond water. Growth (final length, width, weight), specific growth rate (SGR), survival and production of shrimps and crabs were estimated at harvest. ANOVA was done to observe any difference in growth parameters of both shrimp and crabs and Duncan's New Multiple Range Test (DNMRT) was also employed for further analysis of the results.

Source of Information: Bangladesh J. Fish. Res., 11(2), 2007: 189-196

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Bi-culture of shrimp and mud crab seems to be feasible in brackishwater pond conditions. Proper food management may resist/minimize the predatory and cannibalistic behaviour of mud crab. However, further research is needed to improve survival rates of both shrimp and crab in bi or polyculture system.

Knowledge Management: Journal