Abstract
A six months long study on the improved extensive culture of tiger shrimp (Penaeus monodon) was carried out in six ghers (ponds) under three treatments (T1-without feed and fertilizers; T2-only fertilizer; T3- with feed and fertilizers). The stocking density of post-larvae (PL) with a mean initial weight of 0.04±0.01g was 20,000 PLs/ha for T1 and T2 and 33,000 PLs/ha for T3. DO and pH in different ponds ranged from 4 to 13 mg/l and 7.3 to 8.6, respectively with a wide range of fluctuations in salinity levels (5 to 24 ppt) throughout the study period. The survivability rate was highest (54%) in T2 and lowest (38.5%) in T1, while the highest production (570 kg/ha/crop) was obtained in T3 followed by T 2 (372.5 kg/ha/crop) and T1 (236.8 kg/ha/crop). However, no significant (p>0.05) differences were observed between the specific growth rates of shrimp in different treatments, which ranged between 4.15 and 4.45.
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