Aquaculture

Not AvailableThe present study describes the viable and efficient hatchery seed production technique to maximize spotted scat (Scatophagus argus) juvenile production in captivity during the breeding season. Broodstock fish maintained in the earthen pond of hatchery were selected according to varying mean oocyte diameter (MOD) ranging from 351 to 400 (T1), 401?450 (T2), 451?500 (T3), and > 500 ?m (T4) according to natural vitellogenesis progression. Breeding pairs were formed as two males: one female. Females (n = 24) were induced with a double dose of hCG (2000 IU kg?1 body weight day?1) and a single dose of LHRHa (400 ?g kg?1 body weight) each at 24 h interval, whereas males (n = 48) received a single dose of LHRHa (200 ?g kg?1 body weight). Females in T4 were spawned through dry stripping earliest at 30 h post hormone induction, whereas females of the T1 group spawned last at 33 h. The largest (P 500 ?m diameter for artificial fertilization. Seed production can be optimized by adopting a stocking density of 4?6 larvae L?1 in the indoor larval rearing and 3000 fry m?3 in outdoor hapa based nursery systems