|MCCANN, KATIE - University Of Arkansas At Pine Bluff|
|Rawles, Steven - Steve|
|LOCHMANN, REBECCA - University Of Arkansas At Pine Bluff|
|GAYLORD, T. GIBSON - Us Fish And Wildlife Service|
|SEALEY, WENDY - Us Fish And Wildlife Service|
Submitted to: Aquaculture America
Publication Type: Abstract Only
Publication Acceptance Date: 2/21/2019
Publication Date: 3/11/2019
Citation: Mccann, K., Rawles, S.D., Lochmann, R., Gaylord, T., Sealey, W., Abernathy, J.W. 2019. Minimizing fishmeal use in hybrid striped bass (Morone chrysops x Morone saxatilis) diets using commercial protein concentrates designed for aquafeeds. Aquaculture America [abstract]. Aquaculture 2019, March 7-11, 2019, New Orleans, Louisana. p. 702.
Technical Abstract: As part of on-going work at the Harry K. Dupree Stuttgart National Aquaculture Research Center (HKDSNARC) and the University of Arkansas at Pine Bluff (UAPB) to find alternatives to fishmeal (FM) in warmwater fish diets, we evaluated four proprietary commercial protein concentrate blends (Elite 60, Elite 65, Elite 70, and Procision; HJ Baker & Bros, Tuscola) in hybrid striped bass (HSB). These test ingredients are comprised of a proprietary mix of animal (blood meal, feather meal, meat and bone meal, and poultry by-product meal) and plant proteins (soy protein isolate, soy protein concentrate, wheat gluten meal, corn gluten meal, and dried distillers grains with solubles). Evaluation consisted of two phases; a digestibility trial was conducted to assess nutrient availability in the test products, followed by a 13-wk FM replacement trial. Each of the products replaced FM on an ideal protein basis. All diets were supplemented with the first-three limiting amino acids (Met, Lys, Thr) based on the HSB muscle amino acid profile. Diets were isonitrogenous (38% digestible protein), isolipidic (16%), contained 10% lipid from marine fish sources and nearly constant ratio of fish to poultry to soy lipid. Digestibility and replacement diets were extruded using commercial methods (Bozeman Fish Technology Center, MT). Responses in the replacement trial included growth performance, body/ fillet composition, nutrient retention, insulin growth factor- 1, appetite gene expression (cholecystokinin; neuropeptide Y), and innate immunity. There was a linear trend in digestibility of protein and select amino acids (His, Ile, Leu, Phe, Tyr, Val) in the Elite products. Availability of Leu and Phe in Procision was significantly different than FM. At 8 wks, responses to replacement diet showed similar trends with FM outperforming the other diets, Elite products being intermediate, and Procision lagging. There was no linear trend in responses among the Elite products at 8 wks. FCR and ADI (%) of the Elite 70 and FM diet did not differ. Intake on a per gram basis (ADI) was highest but FCR poorest in the Procision diet. 13-wk results and additional responses will be presented.