A freshwater fish related to salmon and trout, with a large colorful dorsal fin and silvery-grey scales.
From 'grey' (the color of the fish) plus -ling (a diminutive suffix), literally meaning 'a small grey thing,' though these fish aren't actually that small.
Graylings have a dorsal fin so spectacularly large and colorful that fly fishermen call them 'the lady of the stream,' and they're so sensitive to water temperature and pollution that they're like nature's canary in the coal mine for river health.
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