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On the left map, we grouped Fish Species that are located close to each other into small circles. Now, you can locate all Fish Species on the map at the same time. You can also drag & zoom the map.

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The rainbow trout is a very popular sport fish. It is silver colored with black spots over its body, dorsal and caudal fins. Adult fish have a distinctive "rainbow" band along the ... moreside of their body.

Rainbow trout are native to many water. They are an easy fish to raise in a hatchery and are stocked. In many cases, rainbow were stocked in both their native and new areas. Today, they are found in lakes, ponds, rivers and small streams throughout the states.

There are many varieties of rainbow trout; some of the varieties have nicknames. We usually think of rainbow trout as a beautiful, but small fish that can be caught most places, most times of the year. 

Kamloop are a type of rainbow trout that was introduced into Idaho. A Kamloop lives part of its life in a lake, and part of its life in a river or small stream. In lakes, Kamloop grow rapidly and many are over 10 pounds when they are caught. A few may get to be over 30 pounds. In fact, the world record rainbow trout was a 39-pound Kamloop from Lake Pend Oreille. Steelhead are a native type of rainbow trout that are anadromous. Anadromous means they spawn in freshwater streams, go to the ocean to grow, and return to fresh water as adults. They are common to the Clearwater, Snake and Salmon rivers.

Life History
Rainbow, Kamloop and steelhead spawn in streams from mid-April to late June. They use areas of gravel, or cobble, depending on the size of the fish. The female rainbow selects a place in a riffle area below a pool to dig a redd (nest). The female displaces the gravel with her body and tail, and the male fertilizes the eggs as they are deposited. The female covers the eggs with gravel by continuing upstream and the current carries the gravel over the eggs.

The eggs hatch in early to midsummer. The young fish may live in the stream a few months, several years, or their entire life. The juvenile Kamloop and steelhead migrate to other waters, usually after two years of rearing in the stream. The juvenile fish that migrate to lakes or the ocean will grow rapidly. The growth of those that remain in the stream varies with the amount of food and temperature of stream.

When they mature and are ready to spawn, the rainbow, Kamloop, and steelhead migrate back to the place they were born. The age of sexual maturity depends on the type of rainbow and where it lives. Most rainbow require 3 to 5 years to mature.

Spawning habitat is not available in many lakes and periodic stocking is required to replenish the population.

Feeding Habits
Rainbow trout eat insects and zooplankton in the water or on the surface. They will also feed on small fish and fish eggs. As they get larger, especially the Kamloop, they will eat larger fish. Adult steelhead holding in the river prior to spawning do not eat much, but will strike at food or lures.

Angling Techniques
The rainbow is popular with anglers. They are widely distributed in accessible waters. They have a reputation for being strong fighters which makes them popular with novice and experienced anglers alike. There are as many ways to catch rainbow trout as there are fishing methods. Rainbow will take all types of bait and lures including trolling spoons, spinners, salmon eggs, corn, or even marshmallows. Many anglers use either fly casting or spinning equipment. Knowing what they commonly feed on in that specific area will help you to choose the right bait. Ice fishing for rainbows is also popular. Usually a bait of worms, maggots, or corn is suspended off the bottom.
The mountain whitefish (Prosopium williamsoni) is familiar to most Montanans. This widespread native fish is primarily a stream-dwelling species, but populations are also found in ... morereservoirs and lakes. The mountain whitefish is found in abundance in most clear, cold rivers in the western drainages and eastern mountain front of Montana. The typical mountain whitefish is a cylindrical 10-16 inch fish, but they can reach a weight of 5 pounds. Trout fishermen frequently catch several whitefish for every trout taken. They are considered a nuisance by some anglers, but are sought after by others. Whitefish provide forage for larger trout. They have evolved with our native trout and have been shown to provide little competition with trout. Their pointed snout and small round mouth makes them efficient at vacuuming invertebrates from the substrate while trout tend to feed more on drifting insects. Mountain whitefish often congregate in large schools on their fall-spawning runs to broadcast their adhesive eggs over gravel bars in tributary streams. Mountain whitefish are one of our most important native gamefish because of their abundance and willingness to take a bait or artificial fly.
The brown trout (Salmo trutta) belongs to a different genus than our native trout species. They evolved in Europe and western Asia and were introduced to North America in 1883 and ... moreto Montana in 1889 in the Madison River. Today brown trout are found throughout most of Montana except the northwest and parts of the east. Generally, they prefer lower gradient, larger streams than cutthroat and rainbow, and they also do well in many reservoirs. Brown trout were widely stocked in the first half of this century, but today most come from natural reproduction. Brown trout are great competitors and generally are more tolerant of dewatering and other environmental disturbances than our other trout species. The state record is 29 pounds, and large fish are not at all uncommon, although 12-20 inches is the usual size range of adults. Brown trout spawn in gravel redds like our native trout but their spawning season is in the fall. This gives them a distinct advantage in some habitats since their spawning and incubation period lies outside the irrigation season. Brown trout are more predaceous than rainbow or cutthroat. Large fish often feed at night on other fish as well as crayfish and other invertebrates.
The Arctic Grayling (Thymallus arcticus) is a species native to northern North America. The only populations native to the lower 48 states were in Michigan and Montana, and the Michigan ... morepopulation is now extinct. Consequently, the fluvial or river-dwelling population in the upper Big Hole River are the last remnants of this native Fish of Special Concern. Originally, the fluvial Arctic Grayling was widespread throughout the upper Missouri river drainage as far downstream as Great Falls. Lewis and Clark made note of these "new kind of white or silvery trout" in 1805. The lake-dwelling form is fairly common in 30 or more lakes across the western half of the state. These lake fish are genetically, but not visibly, different from our native fluvial Arctic Grayling. Grayling are gullible to the angler's lures and also seem to be easily out-competed by other salmonid species. This probably explains much of their demise from their native range. They are spring spawners and broadcast their eggs over a gravel bottom in moving streams. Grayling can overpopulate, producing severely stunted populations in some mountain lakes. Grayling are truly a unique Montana species. The iridescent hues of a spawning grayling's dorsal fin are brilliant. Exceptional individuals can weigh up to 3 pounds and reach 20 inches in length. They are generalists, eating a variety of aquatic invertebrates (Montana Fish, Wildlife, and Parks).