Amino acid-specific δ¹⁵N trophic enrichment factors in fish fed with formulated diets varying in protein quantity and quality.

For instance, Focken ( 2001 ) found a positive trend between whole fish TEF bulk and feeding rate in Nile tilapia ( Oreochromis niloticus ) fed diets containing fish and wheat meals.

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However, we did observe a marked trend toward a greater depletion in 15 N in Lys TEFs with increasing protein content (TEF = 2.3 ± 1.4‰ to −0.8 ± 0.7‰ for diets 40 + 0 to 60 + 0, respectively), which is unexpected given its classification as a source AA.

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