Freshwater Prawn Shrimp Fish Farming and Harvest | Vannamai Shrimp Tradition In India
Freshwater Prawn Shrimp Fish Farming and Harvest | Vannamai Shrimp Tradition In India. Tropical ponds harvesting often begins 5-7 months after PL have been stocked, or sooner if juveniles have been stocked. After cull-harvesting commences, you need to completely seine every pond as soon as monthly or partially seine it twice monthly. Take out the market-sized animals and promote them. Maintain the smaller ones and soft-shelled animals within the pond for additional development. After about 8-11 months, drain the pond and promote the entire harvest. In areas the place water provide is brief, some farmers make the most of water drained throughout full harvesting in different ponds to preserve water however, when you consider doing this, beware that you could be be transferring a water high quality or illness downside from one crop to the subsequent. This follow is just not really helpful on this handbook. After drain-harvesting, you’ll be able to both put together, refill and restock the pond instantly, or hold it empty till you will have sufficient water accessible once more and/or (in temperate zones) till water temperatures turn into appropriate once more for rearing.
Cull-harvesting is just not very environment friendly in eradicating harvest-sized prawns. It doesn’t maximize the overall amount of marketable prawns which could possibly be achieved, partly as a result of some marketable animals stay within the pond longer than vital and partly as a result of the smaller prawns don’t get the utmost probability to develop quicker than they’d have if there have been no dominant prawns left behind. In principle, the very best administration system can be to completely harvest the pond, take away all of the dominant animals, and restock the others in the identical or a distinct pond. Numerous administration methods to maximise pond utilisation and manufacturing price have been described, for instance the modified batch system developed in Puerto Rico, as talked about earlier. A four-pond multi-stage rotational scheme, which incorporates the re-stocking of undersized prawns following harvest. Some dealing with losses happen in the course of the animal transfers vital for these extra advanced administration methods. A lot of these administration could also be possible in giant farms with many accessible ponds. Nonetheless, cull-harvesting, adopted by complete drain-harvesting earlier than re-stocking with a brand new batch, stays essentially the most sensible administration scheme for small freshwater prawn farms.
It is best to perform all harvesting operations as early as attainable within the morning when it’s cooler, to keep away from having water ranges too low when the solar is instantly overhead. When you enable the water to turn into shallow, temperatures can rapidly rise to hazard stage and the prawns shall be subjected to low dissolved oxygen ranges. This may trigger many mortalities earlier than you’ll be able to end harvesting all of the animals.
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