The vannamei shrimp attain 20-25g size within 90-120 days depending on the stocking density. As it lives in water column majority of the stock is harvested by cast netting and drag netting which reduces overcrowding and stress. Production of 6-10 to ha can be obtained with survival rate of 90%.
The vannamei shrimp, Penaeus vannamei commonly known as white legged shrimp. The maximum weight of female in the wild is 42g and that of male 35g. It is an omnivorous scavenger and less aggressive and less carnivorous than the tiger shrimp. It prefers clayey loam soil which can also remain in the water column during culture.
Seed Production :
Water quality management : The method is similar to that explained for the milkfish. Water is allowed to drain off from the facility only after proper effluent treatment.
Spawning : It is similar to that explained for the tiger shrimp. Fecundity is 1-1.4 lakh eggs for a female 30-35g body weight. The female is removed from the maturation unit after 15 spawnings or 3 months.
Incubation : It is similar to that explained for the tiger shrimp. The eggs are incubated at a density of 4000 no. in hatching tank of .3-1 at a temperature of 29-32 degree centigrade ppt. The incubation period is 36 hours and the hatching rate is 70-80%. The eggs hatch out to nauplii and become protozoea within next 36 hours.
Harvest and transportation : The seed is harvested transported PL12 stage after about 21 days from hatching. Other aspects are same as that explained for tiger shrimp.
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Hasnabad di musim panen udang West Bengal
26 сен 2024
