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Fig. 5. Correlation of gill Na+,K+-ATPase activity with dorsal fin pigmentation level, in wild and hatchery-reared smolting masu salmon. Spearman's rank correlation coefficient by rank test was used as statistical analysis. The normal, bold and dotted line show the nonlinear correlations [Pigment] = 61.0 + 16.0 ln [ATPase] (r2 = 0.752, P < 0.0001) in the Ken-ichi River, [Pigment] = 66.8 + 13.7 ln [ATPase] (r2 = 0.879, P < 0.0001) in the Utabetsu River and [Pigment] = 68.9 + 13.0 ln [ATPase] (r2 = 0.806, P < 0.0001) in the hatchery-reared groups, respectively. Reprinted from Aquaculture, 229, Mizuno et al., Quantitative changes of black pigmentation in the dorsal fin margin during smoltification in masu salmon, Oncorhynchus masou, 433–450, © 2004, with permission from Elsevier.

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