straight from your old place of work Salmo.... basically what i said twice, just with not so scientific wording, im not a scientist, and never claimed to be.... but i sure as sh!t can read and tell what someone was trying to say, and i also dont act all high and mighty to the other person that didnt word it like it possibly should have been worded....


They are a unique species; individuals develop differently depending on their environment. While all O. mykiss hatch in gravel-bottomed, fast-flowing, well-oxygenated rivers and streams, some stay in fresh water all their lives. These fish are called rainbow trout. The steelhead that migrate to the ocean develop a slimmer profile, become more silvery in color, and typically grow much larger than the rainbow trout that remain in fresh water.

http://www.fisheries.noaa.gov/pr/species/fish/steelhead-trout.html