A small European freshwater fish with bright colors, known for its interesting breeding behavior where females lay eggs inside mussel shells.
From bitter (perhaps from a bitter taste or aggressive nature) + -ling (a diminutive suffix meaning 'small'). This fish gets its English name from its small size and somewhat sharp characteristics.
The bitterling has one of nature's most surprising partnerships—the female fish uses a long egg-laying tube to inject eggs into mussels, where the eggs develop in safety. It's a tiny fish with a genius-level survival strategy that biologists are still studying.
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