Apparent Digestibilities of Selected Feed Ingredients Fermented by Host Bacteria in Juvenile Turbot, Scophthalmus maxima L.

Fermentation is considered a promising method to improve the limited utilization of plant protein sources. In the present study, Shewanella sp. MR-7, isolated from the intestine of juvenile turbot, was used to ferment selected plant sources. We investigated the apparent digestibility coefficients (ADCs) of three plant sources fermented and not fermented by Shewanella sp. MR-7 in diets of juvenile turbot: soybean meal (SBM), fermented soybean meal (FSBM), peanut meal (PM), fermented peanut meal (FPM), corn gluten meal (CGM) and fermented corn gluten meal (FCGM). The ADCs of dry matter (DM), crude protein (CP), gross energy (GE), and amino acids(AA)were analyzed. Our results showed that the ADC of the plant protein sources improved significantly with fermentation. Moreover, the FSBM showed the highest improvement for apparent amino acid digestibility while FPM showed the lowest compared with the unfermented plant protein source. In conclusion, our results indicated that Shewanella sp. MR-7 fermentation can greatly improve the ADCs of SBM, PM, and CGM in diets of turbot. This study provided valuable information for the use of host bacteria as zymocyte in aquaculture. [ABSTRACT FROM AUTHOR]