Giant river prawn Macrobrachium rosenbergii

Giant river prawn2 مصادر موثّقة

تعريف

The giant river prawn is the largest Macrobrachium, a caridean of South and Southeast Asian rivers and estuaries farmed worldwide since its larval culture was solved in the 1960s; 404,923 tonnes were reported for 2024. Adults are freshwater animals, but the larvae are not. They hatch as planktonic zoeae that die in fresh water and must be reared through eleven stages in roughly 12 parts per thousand brackish water at 28 to 31 degrees Celsius, which is why the hatchery is the phase that carries the losses and why inland hatcheries have to truck in brine. A fully mature female carries 80,000 to 100,000 eggs in an abdominal brood chamber for about twenty days at 28 degrees. Grow-out runs three and a half to six months to roughly 20 g. The distinctive management problem is social rather than infectious: males settle into three morphotypes, blue-claw, orange-claw and small male, and dominant animals suppress the growth of the rest, so a pond yields a wide size spread and is often cull-harvested. Prawns cannibalise each other around moulting, are susceptible to white spot syndrome virus with variable mortality, and are killed by water at or below about 13 degrees.

المؤشّرات الحيوية

مدّة الحضانة: 18 – 23
أقصى طول: 34
حرارة الماء المثلى: 28 – 31
العمر عند أول تكاثر: 3 – 4 months

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