“Average” Size Range: 14? — 17? UP TO 24?+ Brown Trout are considered to be native to Europe and western Asia and were widely introduced to North America in 1883 and in 1889 to the rivers of Montana.
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Lake Trout (Salvelinus namaycush) were one of the first non-native species introduced into Yellowstone. They are also the largest fish species in the park growing to an average length of 20 inches (51 cm).
While the only advisory warning currently in place is related to mountain whitefish and, at present, rainbow trout in the Yellowstone River are safe to eat, avoiding all fish caught in the river may be advisable for now — especially if you have any particular concerns regarding the effects of phenanthrene.
The white sturgeon is the largest freshwater fish in North America. White sturgeon have been reported to reach lengths of 15-20 feet and weights of nearly one ton. The second largest freshwater fish in North America is the alligator gar.
Don't touch any water in or around thermal features. Never swim, soak, or wade in thermal features. More than 20 people have died from intentionally entering or falling into hot springs.
Can You Swim in the Yellowstone River? As beautiful as the Yellowstone River is, you can't swim in it! There are a few legal places within Yellowstone National Park for swimming. To preserve the park, most lakes and rivers are closed for swimming.
Research in America has shown that brown trout are harder to catch than rainbow, brook or cutthroat trout. (Behnke 'About Trout' 1989). The calm before a storm may be one of the best times to catch fish, including trout.