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Comparative Study of Mud Crab (scylla Olivacea) Production in the Sundarbans and in Traditional Shrimp Ghers of Bagerhat District, Bangladesh

Dipak Kamal
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Momotaz Khatun*
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Mst. Muslima Khatun
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Md. Kamrul Islam
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Md. Forhad Uddin
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Abstract/ Executive Summary:

The comparative study of mud crab (Scylla olivacea) production between Sundarbans Mangrove Ecosystem and traditional shrimp ghers was conducted in three major landing centers namely Gona, Digraj and Vaga in Bagerhat region at monthly interval from January to December 2002. The maximum production of 1247.15 MT was estimated from Sundarbans mangrove swamp areas while 1016.30 MT from traditional shrimp ghers. The production of mud crab from the Sundarbans ecosystem was 10.20% higher and significant at a 5% level than the traditional shrimp ghers of Bagerhat region in 2002. There were no significant differences in production at different landing centers, months and seasons. But the production of different grade sizes from the Sundarbans and traditional shrimp ghers in the region showed significant variation (P<0.05). The production from the Sundarbans was found to be consistent round the year, whereas it was seasonal (May to November) for the traditional shrimp ghers. Fishing closure for mud crab inside the Sundarbans should be enforced effectively in order to maintain the supply of mud crab seed for its production from the shrimp ponds throughout the coastal region of Bangladesh.

Keywords: Mud crab (Scylla olivacea), the Sundarbans, traditional shrimp ghers, landing centers.

Location: Gona, Digraj and Vaga in Bagerhat region

Start Date: 00-01-2002

End Date: 00-12-2002

Program Area: Animal Health and Management

Commodity: Crab, Shrimp

Objectives:

A few information on the biology, production and marketing of mud crab are available (Kamal et al., 2003; Khan and Alam, 1992;) from the Sundarbans and TSGs. The main objective of the present study was to compare the mud crab production from the Sundarbans and from TSGs. Other objective was to observe variation in different aspects in mud crab production at different landing centers.

Methodology:

The present study was carried out through field survey at monthly interval from January to December 2002 in three landing centers namely Vaga, Gona Bridge and Digraj in Bagerhat district (Figure 1). The primary data on production from two wild sources namely the Sundarbans and TSGs were collected through a structured questionnaire survey from three randomly selected depots in each landing center. In addition, other information was collected through interviewing mud crab fishers and traders during field survey. Collected data were analyzed using MS-Excel (Version 0.5) and SPSS. The production at each landing center was calculated by multiplying the average production from three randomly selected depots with the total number of depots in corresponding landing center as follows:

P = D * Pi

Where, p = Production of mud crab in Kg;

D = Number of mud crab depots in a landing centers;

Pi = Average production of three randomly selected depots

In addition, the total production of mud crab from the Sundarbans and TSGs in the Bagerhat region was calculated by multiplying the mean production from nine surveyed depots with a total number of depots in the three landing centers of the Bagerhat region.

Source of Information: Khulna University Studies, 9(1): 101-110, 2008

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The production of mud crab from the Sundarbans is significantly higher (10.20%) than the production from the TSGs. It was found that the production of mud crab from the Sundarbans mangrove ecosystem was carried out throughout the year, although Sundarbans Forest Department prohibited mud crab fishing during the periods December to February and May to June. The enforcement of fishing prohibition inside the Sundarbans Reserve Forest area during closed season and practice of fattening of female mud crab may induce higher production of mud crab in TSGs. Awareness of traditional shrimp farmers should be developed in order to increase the production of mud crab per unit area as the second crop to target P. monodon. Government should take a responsive training program for the fattening pond owners for better cultivation of rejected male and female crab through aquaculture like tiger shrimp.

Knowledge Management: Journal