Effect of dietary lipids on fatty acid composition and metabolism in juvenile green sea urchins (Strongylocentrotus droebachiensis)

摘要: Relatively little is known of the nutritional requirements sea urchins, especially at juvenile stages. One costly restrictions on feed formulation for marine fish species requirement oils to supply essential n-3 highly unsaturated fatty acids (HUFA). This study investigated effects different dietary lipid sources acid composition and metabolism green urchins (Strongylocentrotus droebachiensis). Kelp (Laminaria longicruris) served as a reference diet. Experimental diets contained 5% of: corn oil (high in 18:2n-6), linseed 18:3n-3), menhaden HUFAs 20:5n-3 22:6n-3), or 1:1 mixtures oil, oil. Unlike fish, exhibited ample ability elongation desaturation shorter chain (18 carbon) polyunsaturated (PUFA) longer (20 n-6 HUFA. Thus 18:2n-6 from diet resulted high levels 20:4n-6 urchin similarly 18:3n-3 20:5n-3. Even when fed kelp with did not incorporate 22:6n-3 into their lipids. In addition lipids total soft tissues urchin, there were great differences among classes these tissues. For example, test (shell) associated tissue membranes, which are constant contact seawater, incorporated much higher proportions than gonad gut may reflect an important role ion transport osmoregulation. The also synthesized number 20 22 carbon non-methylene-interrupted dienes (NMID) concentration major NMID was directly related inversely proportional PUFA significance other interesting aspects discussed.