1. stickleback

noun. Small (2-4 inches) pugnacious mostly scaleless spiny-backed fishes of northern fresh and littoral waters having elaborate courtship; subjects of much research.
Synonyms
Gasterosteus aculeatus spiny-finned fish Gasterosteus pungitius three-spined stickleback family Gasterosteidae acanthopterygian Gasterosteidae ten-spined stickleback prickleback
Antonyms
soft-finned fish
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