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January 10, 2014

Bangladesh

Shrimp Hatcheries

 

The first shrimp hatchery in Bangladesh was established by the Department of Fisheries (DOF) in Cox’s Bazar in 1987.  Presently, 57 shrimp hatcheries are in operation, all of which are located in Cox’s Bazar.   Present annual demand for giant tiger shrimp (Penaeus monodon) postlarvae (PLs), as reported by the secretary of the Shrimp Hatchery Association of Bangladesh, is about 8 billion and present annual production is about 6–7 billion, although hatcheries do have the capacity to produce 15 billion PLs.  Currently, the gap between hatchery production and demand is filled by the harvest of wild PLs.

 

Each hatchery uses approximately 250 to 350 broodstock for a production cycle lasting 25 to 35 days (average 30 days).  The production cycle begins with bringing broodstock into the hatchery and ends with the sale of PLs.

 

Domesticated P. monodon broodstock is unavailable in Bangladesh and hatcheries are completely dependent on wild broodstock from the Bay of Bengal.  However, unlike domesticated broodstock, which can be raised in a controlled, disease-free environment, wild broodstock are frequently exposed to or infected by pathogens, including WSSV.  WSSV can be vertically transmitted from WSSV-positive spawners to their postlarvae.  This has important implications for the prevention of disease at the growout stage since infected postlarvae can represent a major source of infection for shrimp farms.  This means that screening and selecting WSSV-negative broodstock can markedly reduce the chances of a subsequent outbreak of WSSV, providing that appropriate management practices for reducing the likelihood of horizontal transmission are followed.

 

In a 2011 study, researchers found that the incidence of WSSV in broodstock from hatcheries in Coxs Bazar ranged from 0% in September to as high as 90% in May/June, with a similar, but delayed, pattern in nauplii and postlarvae.

 

Source: Aquaculture.  Comparative Study of the Reproductive Performance and White Spot Syndrome Virus (WSSV) Status of Black Tiger Shrimp (Penaeus Monodon) Collected from the Bay of Bengal.  [The full text of this study is available at the previous link.]  Partho Debnath (email p.debnath@cgiar.org), Manjurul Karim and Ben Belton (WorldFish, Bangladesh and South Asia Office, House 22B, Road 7, Block-F, Banani, Dhaka 1213, Bangladesh).  Made available online on January 5, 2014.

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