Black Prawn is one of export oriented product in Bangladesh. These exported in many countries of this world specifically in Europe, America and some Asian country. There was a time it was one of the top most exported product in Bangladesh. These are mostly farmed in our Khulna Division, Barisal Division, Chittagong Division and Satkhira District. Most of the people there earn their livelihood by farming these. Our countries weather is very favorable for farming these. It is very tasty and nutritious fish. Lot of people love to eat these in their lunch or dinner as curry. These are mainly farmed in salty water near river and sea flow by barricade. So these can be farmed until we have these salty water river and sea flow.
A freshwater prawn farm is an aquaculture business designed to raise and produce freshwater prawns or shrimp1 for human consumption. Freshwater prawn farming shares many characteristics with and many of the same problems as, marine shrimp farming. Unique problems are introduced by the developmental life cycle of the main species (the giant river prawn, Macrobrachium rosenbergii).
Lifecycle of White Gold or Prawn Fish:
Prawns can live for two to three years. They mature at about six to eight months of age, and spawning occurs in offshore waters. King prawns tend to spawn throughout the year while tiger prawns mainly spawn during spring and summer. A single prawn can spawn more than once in any one year. The female releases hundreds of thousands of eggs.
Fertilised eggs hatch within 24 hours and larvae spend time floating in the water, developing through a number of stages, as they drift shoreward to shallow, hypersaline (highly salty) waters. When they reach these shallow waters, they’re called ‘postlarvae’, and are ready to settle on the bottom, where they develop into juvenile prawns.
They remain in the nursery areas for up to six months before they reach a size (near their size at maturity) when physiological changes demand they move back to oceanic waters to mate and spawn, completing their lifecycle.
During this migration, the prawns enter the trawling grounds (mainly sandy or muddy-bottomed areas) where they can first be caught commercially. These areas are generally offshore, in waters 10 to 30 m deep. This migration takes place in summer and autumn each year and is known in the industry as ‘recruitment’.
Diet of Prawn or White Gold or Bagda Fish:
Prawns eat plant material, decaying organic matter, micro-organisms, small shellfish and worms. King prawns are sensitive to light so they bury themselves during the day and feed actively at night. Tiger prawns tend to be active day and night.
Prawn of World:
Prawn is a common name for large swimming crustaceans, particularly in Britain and Commonwealth nations, and are also called shrimp. Significant commercial species valued for food tend to be large, and thus tend to be called prawns. Shrimp that fall in this category often belong to the suborder Dendrobranchiata. The term is used less frequently in North America, and typically for freshwater shrimp.
In the United Kingdom prawn is more common on menus than shrimp, while the opposite is the case in the United States. The term prawn also loosely describes any large shrimp, especially those that come 15 (or fewer) to the pound (such as king prawns or jumbo shrimp).