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Feeding duration of dietary Nodulisporium sp. KT29 to prevent the infection of Vibrio harveyi on pacific white shrimp Litopenaeus vannamei
This study was conducted to determine the best feeding duration in the administration of Nodulisporium sp. KT29 metabolites to improve the growth performance and prevent the infection of Vibrio harveyi on Pacific white shrimp (Litopenaeus vannamei) under sea floating net cages. The experiments consist of two phases, i.e 1) the preliminary test to determine the optimum dose of Nodulisporium sp. KT29 metabolites; 20 mL kg⁻¹ and 40 mL kg⁻¹ and 2) the in vivo test to determine the best duration of administration, this study was conducted through a completely randomized design. The treatments given before the challenge test was performed in sea floating net cage for 21 days, while the challenge test was carried out on a laboratory scale. The preliminary test results revealed that the best dose of Nodulisporium sp. KT29 used for in vivo test was 20 mL kg⁻¹ of feed. The result of in vivo test showed that the administration of Nodulisporium sp. KT29 metabolites for seven days resulted the best growth performance, survival rate and immune response after the challenge test.