Qualities of shellfish broodstock

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Presentation transcript:

Qualities of shellfish broodstock Size range of brood crabs Sex S.tranquebarica S. serrata ( Carapace width in mm / Total weight in g) Males 125-165 mm / 330-685 g 80-135 mm / 90-590 g Females 129-175 mm / 300-690 g 85-137 mm / 98-340 g

Breeding Biology & Hatchery management of Penaeus monodon Weight range of mother shrimp - 70-150g Average weight for best breeding - 120g Average fecundity of P. monodon - 8-10 lakhs per female shrimp of 100g Hatchability _________________ - 95 – 100% (sometimes fractional) Breeding programme: Breeder stocking density : 1per 2 m2 Breeder type : Impregnated in wild waters (females) (to be collected for every breeding) Hatching time : Early morning hours – induced by EDTA Total number of larval stage : 12 (Twelve stages) : Nauplii 1 – 6 Proto Zoea 1 -3 Mysis 1 – 3 Feed to be given : First feeding Micro algae – Skeletonema or Tetraselmis After PZ 3 – Artemia and Spirulina Duration of larval rearing : 13 – 15 days (depending on water temperature) Average survival of larvae : 20 % Average yield per cycle : 1.0 to 2.5 lakhs per cycle (For a breeder of 100g)