steelhead

plural steelheads

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.

   2007, John Shewey, On the Fly Guide to the Northwest, page 79

   2 more examples

   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).

   2007 October 9, Henry Fountain, “Downside to Breeding Fish in Captivity Shows Up Early”, in New York Times

   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.

   2021 November 23, Robin Craig, “In dispute over groundwater, court tells Mississippi it’s equitable apportionment or nothing”, in SCOTUSblog

2. The ruddy duck.