Once they reach about 17-18 inches in length, they may find it difficult to maintain their weight by bug-eating alone, and they'll start transitioning to a more pisciverous lifestyle, meaning they start hunting non-bug prey. In some waters, the trout may feed largely on small crustaceans like scud (small freshwater shrimp) and sowbugs (aquatic "rolly pollies"). Rainbow trout, once they've lived wild for a while, will feed almost exclusively on aquatic insects (mayflies, caddis, midges, etc.), and terrestrial insects (ants, beetles, grasshopper, etc.). Hatchery trout spend 15 months or so eating about 1-1/4 pound of trout chow to grow to stockable size. Although there are several wild rainbow populations that can be found throughout the state, most of the decent-sized rainbow trout you'll find are hatchery-raised. Some of these original strains of trout continue to exist to this day. In fact, some of the earliest stockings were accomplished by railroad workers who dumped buckets of small trout into the streams the trains crossed. They were first introduced in Missouri's cold water streams in the 1880's.
The Rainbow Trout is by far the most numerous trout found here.
Since the Southern half of Missouri is so rich with springs, there are numerous cold water rivers and streams that are perfect for these fish. And while there is some evidence that a few brookies have been caught in rare circumstances near historical private hatchery operations where brook trout may have been hatched at some point in the past, the "golden trout" are most certainly "palomino trout," which is essentially a yellow and white rainbow trout - NOT a true golden trout. All Missouri trout are restricted to cold water locations where the water temperature doesn't generally move much above 75 degrees, even in the hottest part of the summer. Over the years, I've heard the occasional rumor floated about some brook trout and even a few golden trout here and there. We have two primary species available in Missouri: the rainbow trout and the brown trout.
It makes sense to start at the beginning, and the first question is obviously "what is a trout?" The trout found in Missouri are members of the salmonid family, and they act similar to salmon in many ways.
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