Abstract
The present study was conducted in three upazilla (Bagerhatsadar, Fakirhat and Rampaul) to investigate the shrimp diseases and culture strategies of Bagerhat district in 2012. Post larvae (PL-13/21) from hatchery and natural were used to stock in the study area. The highest mean stocking density was recorded in the ghers of Rampaul (16796±7729.69 PL/ha), where the maximum survival rate was also found (63.00±11.52 %). The highest dose of lime was recorded as 302.58±50.92 kg/ha at Bagerhat sadar; cowdung was recorded as 605.16±118.46 kg/ha at Fakirhat upazilla and urea was recorded as 29.02±5.84 kg/ha (Bagerhat sadar) respectively. The maximum doses of MP and TSP were recorded as 34.58±4.51 kg/ha at Bagerhat sadar and Fakirhat and 27.79±3.71 kg/ha at Bagerhat sadar respectively. No supplementary feed were fed to shrimp, in where culture dependent on natural foods. The highest shrimp production was found in Fakirhat upazila (667±307.05 kg/ha) and the lowest production was in Rampaul upazilla (497±268.97 kg/ha). Sudden change of pH , low dissolved o2 levels, salinity variations, nutritional deficiency and other environmental changes causes yellow head viral disease (YHD), white spot syndrome viral (WSSV), vibriosis, fusarium and protozoan were recorded during the experimental period.Asian J. Med. Biol. Res. December 2015, 1(3): 545-552
Highlights
Bangladesh is enriched with a vast aquatic resource in the forms of both freshwater and brackish water
Many hatcheries have been established in the study area for supplying of post larvae (PL) to the farmers
The highest mean stocking density was recorded in the ghers of Rampaul (16796±7729.69 PL/ha) (Table 1).The maximum survival rate was found in the ghers of Rampaul (63.00±11.52 %) followed by Fakirhat and Bagerhat (Table 1)
Summary
Bangladesh is enriched with a vast aquatic resource in the forms of both freshwater and brackish water. Brackish water bodies are suitable for shellfish production. Different water bodies are very productive in this country. Bangladesh entered the global export market for shrimp in the early 1970s. It is the second largest foreign income earner. The contribution of coastal aquaculture, black tiger shrimp (Penaeusmonodon) culture to both rural and national economics have become a major source of export earnings and employment in the coastal areas of Bangladesh. Exclusive Economic zone 24,800 sq miles and an extended coast line of about 710 km of which only 0.143 million hectares of land has been brought under brackish water shrimp aquaculture. Shrimp culture is widely practiced in Khulna, Satkhira, Bagerhat, Cox’s bazar due to entrance of tidal water throughout
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