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Fig. 2. Dorsal fin pigmentation during smoltification of wild masu salmon in the Utabetsu River. Upper pictures in grayscale, lower pictures after black and white transformation by an imaging software. The lines from 'a' to 'e' indicates dorsal fins in January, February, March, April and May, respectively. Scale bar shows 100 μm. 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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