Abstract
Atlantic herring larvae (Clupea harengus) were fed two enriched Artemia diets with different contents of (n‐3) highly unsaturated fatty acids (HUFA), one containing low levels of 20: 5(n‐3) and no 22: 6(n‐3), the other containing substantial levels of both 20: 5(n‐3) and 22: 6(n‐3). After 30 days of culture, fatty acid compositions of lipid classes in the heads, bodies and eyes of the larvae were analysed. Fish fed Artemia with the low (n‐3) HUFA diet lacking 22: 6(n‐3) had lower amounts of total (n‐3)HUFA and, in particular, of 22:6(n‐3) in individual phospholipids and total neutral lipids of heads, bodies and eyes as compared to fish fed Artemia with high levels of (n‐3)HUFA. The amount of 22: 6(n‐3) in the fatty acids of phosphatidyl‐ethanolamine of eyes was particularly susceptible to dietary depletion. The implications of these findings are discussed, particularly in relation to dietary requirements for 22: 6(n‐3) during development of neural tissue in predatory fish iarvae.
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