A salmon or other fish with a bluish-colored back, or a historical term for certain salmon species found in Pacific waters.
Compound of 'blue' and 'back,' referring to the coloration of the fish. Used since the 19th century by fishermen to distinguish salmon varieties by their appearance.
Bluebacks are sockeye salmon heading upriver to spawn, and their 'blue back' color isn't for hiding—it's actually a sign they've stopped eating and their bodies are preparing for an exhausting final journey upstream!
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