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The bacterial probiont Bacillus S11 (BS11) was used as a supplement in feed (PF) for black tiger shrimp Penaeus monodon in 2 earthen pond field-trials carried out for 100 d during 2 different seasons in Thailand. Growth and survival were compared with those of shrimp receiving an unsupplemented feed (UF). In the hot and cool seasons, respectively, shrimp fed PF grew significantly larger and had significantly higher survival than shrimp fed UF (p < 0.05). Projected yields on an annual basis (two 100 d crops) were 49% greater with PF-fed shrimp. In 8 d challenge tests using the luminescent bacterium Vibrio harveyi 1526, shrimp fed UF all died within 6 d while survival for shrimp fed PF was 5 and 9%.KEY WORDS: Marine shrimp culture · Black tiger shrimp · Pond culture · Penaeus monodon · Probiotic · Bacillus S11Resale or republication not permitted without written consent of the publisher

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