Effects of Alternative and Sustainable Ingredients on Rainbow Trout (Oncorhynchus mykiss) Growth, Muscle Composition and Health

Aquaculture supplies more than 50% of the total fish consumed by world population. It is considered FAO authorities that it will be main source fishery products 2030. These positive data are contradicted fact aquaculture relies too much on oil and meal as essential ingredients for food, which exerts significant pressure marine ecosystems. The present study was planned to look alternative in aquafeeds three different were evaluated first time juveniles rainbow trout: (1) House cricket, Acheta domesticus, (DI) a quality protein source; (2) mixture four microalgae species (DM), an important lipids; (3) lipid fraction recovered from cooking water canned tuna manufacturing processes (DP&L); (4) mix (DMIX). All feeds assayed compared with commercial feed (DC). Results showed formulated had effects growth fish. DI DP&L have similar performance control, while fed DM DMix slightly lower (p < 0.05). No differences observed terms FCR (Feed Conversion Ratio) PER (Protein Efficiency Fish muscle composition did not show any moisture, protein, lipids carbohydrates content. Only difference detected ash saturated fatty acid (SFA) content hepatosomatic index (HSI) significantly reduced DC 0.05), whereas viscerosomatic (VSI) higher DM. nutritional value trout at end shows highest PUFA/SFA ratio lowest atherogenic (AI), DMIX n-3/n-6 AI. among diets thrombogenic (TI) values. Any these might used sources because no negative growth, composition, health or final value, except case microalgae, needs research adjust its inclusion rate feed.