steelhead

noun

1. The anadromous form of the rainbow trout, Oncorhynchus mykiss.

   “She tried the same cast several times. I signaled her to switch flies. After two such changes we still couldn't move the fish. Some steelhead are biters; some are not.”

   “The researchers compared three groups of steelheads: fish born of two wild parents and reared in the wild; first-generation captive fish (born of two wild parents and reared in captivity); and second-generation captive fish (with one captive-bred parent).”

   “Emphasizing that it has applied equitable apportionment to not only rivers and streams but also to interstate river basins, to groundwater pumping that affects surface water flows, and to anadromous fish like Chinook salmon and steelhead trout, the court stated that equitable apportionment applies only when transboundary resources are at issue.”

2. The ruddy duck.