USING A HIGH-PROTEIN BREWER YEAST PRODUCT (DBY50) TO REPLACE FISHMEAL AND SOYBEANMEAL IN PRACTICAL DIETS FOR THE PACIFIC WHITE SHRIMP Litopenaeus vannamei

Jingping Guo*, Xuan Qiu, G.A. Harsha S. Chaturanga and D. Allen Davis
 
School of Fisheries, Aquaculture and Aquatic Sciences
Auburn University, Auburn, AL 36849  
JZG0078@auburn.edu
 

Two 6-week growth trials were conducted to evaluate the utilization of an all-nature high-protein brewer yeast product (DBY50) on growth performance of the pacific white shrimp, Litopenaeus vannamei in practical diets. In the first trial, grade levels of DBY50 (0, 6, 12, 18, and 24%) was used to replace fishmeal (FM: 19.12, 14.34, 9.56, 4.79, and 0%). As second series used graded levels of DBY50 (0, 6, 12, 18, and 24%) as a replacement for soybean meal (SBM) referred to as Diet 1-5, and Diet 4 and 6-9, respectively. Each diet was randomly fed to 4 replicate groups of 10 shrimps per diet. After the feeding trial, the result showed that there were no significant differences in final biomass, survival, FCR and limited differences in final weight and weight gain. To confirm the results in the first trail, we repeat Diet 1 and Diet 3-6 as well as a low fishmeal diet containing 2% of a 75% protein product [DBY70 (Diet10)]. Each diet was randomly fed to 4 replicate groups of 30 shrimp per diet. Result showed that there were no significant differences in final biomass, mean weight, survival, weight gain and FCR among all the treatment. Shrimps fed the high fishmeal basal diet exhibited significantly higher weight gain than those offed the diet containing 24% DBY50. There was no difference in performance of shrimp offered low fishmeal diet or the low fishmeal diet containing DBY70. In general, 18-24% BDY50 can be used in practical diets as a replacement for fish meal or up to 24% when replacing soybean meal.