Growth based changes in amino acid isotopic composition in captive Pacific bluefin tuna (<i>Thunnus orientalis</i>).

Incorporation of 15N into amino acids of white muscle tissue as a function of relative growth (WR). A) Four source amino acids, glycine (unfilled circle), lysine (unfilled square), serine (unfilled triangle), threonine (unfilled inverted triangle), and B) five trophic amino acids - alanine (filled circle), glutamic acid (filled square), leucine (filled triangle), proline (filled inverted triangle), and valine (unfilled diamond) are given. Lines represent best fit lines for an exponential fit model.