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threespine stickleback

or three-spined stick·le·back

[three-spahyn stik-uh l-bak or three-spahynd stik-uh l-bak]
noun
  1. a widely distributed stickleback, Gasterosteus aculeatus, occurring in marine, brackish, or fresh waters throughout the northern hemisphere.
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Origin of threespine stickleback

First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018