USE OF DRY HYDROLYSATE FROM SQUID AND SCALLOP PRODUCTS IN PLANT BASED DIETS FOR PACIFIC WHITE SHRIMP Litopenaeus vannamei  

Yangen Zhou*, Ramasamy Thirumurugan, Qingkui Wang, Chong M. Lee, and D. Allen Davis
School of Fisheries,
Aquaculture and Aquatic Sciences,
 AL, USA 36849-5419
yzz0027@tigermail.auburn.edu

 

 

The aim of this study is to develop value added products from waste streams of squid and scallop processing centers for the use in aquatic animal feeds. Towards this goal, a series of growth trials were conducted to evaluate the use of dry hydrolysate from squid and scallop waste as attractants/palatability enhancers or as a specialty ingredient in plant-based feed formulations for Pacific white shrimp Litopenaeus vannamei. All experimental diets were formulated to be isonitrogenous (approximately 35% crude protein, 8% lipid), incrementally replacing soybean meal with the test ingredients. In trial 1, the basal diet (PB) was formulated to contain 56.8% SBM and the other test diets were designed by gradually replacing of SBM with dry squid hydrolysate (DSqH) or dry scallop hydrolysate (DScH) The other test diets resulting from the soybean meal replacement contained 3% (PBsq3 or PBsc3), 6% (PBsq6 or PBsc6), and 9% (PBsq9 or PBsc9) dry squid or scallop hydrolysate. The other two diets were contained high level of the impregnated SBM with 6% squid hydrolysate (ISq6) or 6% scallop hydrolysate (ISc6). In trial 1, juvenile shrimps (initial weight 0.66 ± 0.03 g, n=4) were stocked at a density of 10 shrimps per tank over a 6-week feeding trial. In trial 2, shrimp were offered the three plant based diets (high level soybean meal) includes control diet, and 3% DSqH or DScH of diets. In trial 2, juvenile shrimps (initial weight 0.80 ± 0.04 g, n=4) were stocked at a density of 10 shrimps per tank over a 6-week feeding trial. In both trials, daily feeding rates were calculated, based upon an expected weight gain and feed conversion ratio. Additionally, another group of shrimp (initial weight 2.99 ± 0.14 g, n=4) were used to determine consumption as measured over 3 feeding/day for three days with 1 hr interval between feeding. At the end of two trials, no significant differences with regard to final biomass, final mean weight, percent weight gain, feed conversion ratio (FCR) were observed among treatments. Based on the present results, the hydrolysate products could be as potential alternative ingredient for use in aquaculture diets.