SUSTAINABLE SABLEFISH FEED USING FULL FAT SOYBEANS AND FISH TRIM

Heated (HSB) and unheated (SB) full fat soybeans, soy protein concentrate (SPC), and trim waste from Pacific whiting were incorporated into feeds for marine sablefish. The three feed treatments were formulated with equal amounts of soy protein.  Feeds containing HSB and SPC performed significantly better than feed containing SB (Fig. 1).   After feeding to satiation for 8 weeks histomorphologic evaluation of distal intestine 2 cm from rectum  was conducted by Fish Vet (Portland, ME).  Varying levels of inflammation were measured for all three treatments (Fig. 2).  Fisher's exact test showed significant difference (P = 0.013) in mononuclear cell infiltration of fish fed heat treated full fat soybeans (HSB) versus unheated full fat soybeans (SB).  Fish receiving  HSB  feed  had  significantly  lower intestinal  inflammation  than  SB fish  (Fig. 3 and

Fig. 4).  HSB performed as well as SPC and is a much lower cost ingredient.