Reevaluating Polyunsaturated Fatty Acid Essentiality in Rainbow Trout

The National Research Council ( NRC ) reports that the essential fatty acid requirements of Rainbow Trout Oncorhynchus mykiss can be satisfied by 0.7–1.0% 18:3(n‐3) or 0.4–0.5% n‐3 long‐chain ( LC ) polyunsaturated fatty acids ( PUFA s; defined by NRC as 20:5[n‐3] + 22:6[n‐3]) in the diet. These requirements were defined roughly 50 years ago and do not consider the importance of n‐6 PUFA s in the diet. Therefore, we assessed survival, growth...