Abstract
Fermentation-biotechnology to produce high-protein agricultural biomass with potential as a feed ingredient is well-established. However, practical applicability of this technology in aquaculture has not been fully realized. The present work evaluates the nutritional and feed value of fermented sweet potato meal (ProEn-KTM) to replace soybean meal in the diet of juvenile Penaeus vannamei. Four experimental diets containing graded levels of ProEn- KTM replacing 0 (%), 25 (%), 50 (%) and 100 (%) of soybean meal were formulated and fed to P. vannamei for 8 weeks. Results showed that 100 (%) of soybean meal can be replaced by fermented sweet potato and 50 (%) replacement elicited growth promoting effects. Survival, feed conversion, and body composition were similar in all treatments. Dietary inclusion of fermented sweet potato promotes better ratio of the n-3/n-6 fatty acid and lowers the total gut bacteria as well as total Vibrio. Collectively these results suggest that fermented sweet potato meal could fully replace soybean meal in P. vannamei diet. The use of this feed ingredient is a practical approach to meet the increasing needs of proteins in feeds for the expansion and sustainability of P. vannamei aquaculture.
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