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Fig. 1. Observed portion of dorsal fin pigmentation. Panel A indicates the entire dorsal fin of wild masu salmon smolt in the Ken-ichi River. Panel B is magnified from the small rectangular area indicated in panel A. In panel B, the white square (100 μm × 100 μm) shows the portion of the dorsal fin observation. IV: fourth soft ray, V: fifth soft ray, VI: sixth soft ray. Scale bars show 1.00 mm. 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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