A freshwater fish related to trout, known for its large, colorful sail-like dorsal fin and delicate body.
From Old English, possibly from gray (the color) combined with the suffix -ling (meaning small or young creature). The name likely refers to its grayish coloring or scale patterns.
Grayling are so sensitive to water pollution that biologists use them as 'canary in the coal mine' indicators—if the grayling population is healthy, the entire stream ecosystem is likely thriving!
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