stick·le·back /ˈstɪkəlˌbæk/
  棘魚
  Stic·kle·back n.  Zool. Any one of numerous species of small fishes of the genus Gasterosteus and allied genera. The back is armed with two or more sharp spines. They inhabit both salt and brackish water, and construct curious nests. Called also sticklebag, sharpling, and prickleback.
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  stickleback
       n : small (2-4 inches) pugnacious mostly scaleless spiny-backed
           fishes of northern fresh and littoral waters having
           elaborate courtship; subjects of much research [syn: prickleback]