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We are all familiar with the dietary guideline exhorting us to eat so many portions of oily fish per week in order to boost our intakes of n-3 long-chain PUFA, but it is perhaps not so widely realised that the fish must themselves be provided with dietary n-3 long-chain PUFA or, possibly, their precursors (though, as in humans, the ability of carnivorous fish to elongate and desaturate n-3 PUFA appears to be limited).
Younger, K. (2008). Nutrition Research Reviews: Editorial. Nutrition Research Reviews, Access Volume 21, Issue 2, pp. 83-84. doi:10.1017/S0954422408182579