I am planing to do a genetic improvement project for white shrimp. The stage of transportation broodstock white shrimp from wild pond to hatchery until eyestalk ablation is like a gambling. Some time the success ratio is below 20%。Now we are suffering a high broodstock mortality in the hatching tank. Is there anyone have a better success experience for feeding broodstock during this pre-maturation stage?
First one has to simulate the conditions in the tank as near as those found in its habitat. Having done that, they have to be given the correct day light hours vis-a-vis night hours,the former with correct light intensity.The tanks may be coated with epoxy surface,so as to lessen any laceration as it moves along its surface.Adult artemia along with inert feed fortified with fish/shark oil attractant @ 20 ml/1kg of wet dough would be another way to make them feed. Remove detritus/dead matter once/24 hrs.
Once your broodstock shrimp is fully acclimated to the hatchery maturation tanks, mortality rate should not be higher than 20%. Maturation diet may include polichaetes, squid, fresh fish/clams up to 4% of their body weight/day. Yes, photoperiod and cleaning conditions of your maturation tanks are very important., as well as ablation before females gonads reach full maturation.
Before transport you must keep your brood stock holding tank ready in the hatchery. The tank should be filled with similar salinity water prevailing in the pond where shrimps are to be collected. After acclimatization to the new environment, give the similar feed which used to give in the ponds. Later slowly shift to maturation feeds as suggested by Rey. Polichaetes are best for maturation.
The following is my feeding protocol when conducting GENETIC selection for Litopenaeus vannamei broodstock:
When starting with wild broodstock acclimate them to the new water condition prevailing in your maturation tanks (salinity, temperature and pH) for at least during 6 to 8 hours. Better to start with shrimp raised in your grow-out ponds at a density of 10shrimp/M2 since mortality decreases considerably. When harvesting your shrimp select the largest 200 animals and continue raising them for another 4-5 months. Feed them with pelleted formulated shrimp feed (crude protein content between 40-42%); stocking density: 5 animals/M2. When harvesting those shrimp select the largest 100 animals and stock them in your maturation tanks at a density of 2 shrimp/M2. Then feed them with fresh polichaetes (50%), plus fresh squid/fish and clams the other 50%. Ideally you should stock them in your maturation tanks at a male-female ratio of 2:1
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