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A freshwater prawn farm is an aquaculture enterprise designed to lift and produce freshwater prawn or shrimp1 for human consumption. Freshwater prawn farming shares many traits with, and lots of the identical issues as, marine shrimp farming. Distinctive issues are launched by the developmental life cycle of the primary species (the enormous river prawn, Macrobrachium rosenbergii).[1]
All farmed freshwater prawns in the present day belong to the genus Macrobrachium. Till 2000, the one species farmed was the Large river prawn (Macrobrachium rosenbergii, often known as the Malaysian prawn). Since then, China has begun farming the Oriental river prawn (M. nipponense) in massive portions, and India farms a small quantity of monsoon river prawn (M. malcolmsonii). In 2003, these three species accounted for all farmed freshwater prawns, about two thirds M. rosenbergii and one third M. nipponense.
There are about 200 species within the genus Macrobrachium. They happen all through the tropics and subtropics on all continents besides Europe.
Large river prawns stay in turbid freshwater, however their larval phases require brackish water to outlive. Males can attain a physique dimension of 32 cm;females develop to 25 cm. In mating, the male deposits spermatophores on the underside of the feminine’s thorax, between the strolling legs. The feminine then extrudes eggs, which go by means of the spermatophores. The feminine carries the fertilized eggs together with her till they hatch; the time could fluctuate, however is usually lower than three weeks. A big feminine could lay as much as 100,000 eggs.
From these eggs hatch zoeae, the primary larval stage of crustaceans. They undergo a number of larval phases earlier than metamorphosing into postlarvae, at which stage they’re about 8 mm lengthy and have all of the traits of adults. This metamorphosis often takes place about 32 to 35 days after hatching. These postlarvae then migrate again into freshwater.
There are three completely different morphotypes of males. The primary stage is named “small male” (SM); this smallest stage has quick, practically translucent claws. If situations enable, small males develop and metamorphose into “orange claws” (OC), which have massive orange claws on their second chelipeds, which can have a size of 0.8 to 1.4 their physique dimension. OC males later could remodel into the third and closing stage, the “blue claw” (BC) males. These have blue claws, and their second chelipeds could change into twice so long as their physique.[3]
Male M. rosenbergii have a strict hierarchy: the territorial BC males dominate the OCs, which in flip dominate the SMs. The presence of BC males inhibts the expansion of SMs and delays the metamorphosis of OCs into BCs; an OC will continue to grow till it’s bigger than the most important BC male in its neighbourhood earlier than reworking. All three male phases are sexually energetic although, and females who’ve undergone their pre-mating molt will cooperate with any male to breed. BC males shield the feminine till their shell has hardened, OCs and SMs present no such conduct.
Information Taken from Wikipedia.com
Credit to Wikipedia.com
http://en.wikipedia.org/wiki/Freshwater_prawn_farm
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