The delicious fish is native to the waters off California, Oregon and Washington. It’s essentially a robust rainbow trout that has spawned in fresh water rivers and streams but then, like salmon, has gone out to sea, where it grows bigger, with typically orange-red flesh. In the wild, it is a federally protected species, with a regulated commercial fishery. There is some recreational steelhead fishing in New York State and the surrounding areas because rainbow trout was introduced from the West about 150 years ago. Now steelhead is being farmed upstate at Hudson Valley Fisheries, where it can reach nearly seven pounds and is raised without hormones, antibiotics and parasiticides.