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FISHES OF THE YELLOWSTONE NATIONAL PARK. PA 
In streams where overgrowth prevents fly casting, angleworms, 
rasshoppers, or almost any bait will be taken when the trout is 
eeding. Everything will be disregarded when it is not feeding. 
The best flies to use in any body of water must be learned by experi- 
ence, but the brown hackle is seldom a failure anywhere. Professor, 
ueen of the water, Montreal, coachman, and many others are usu- 
alle quite successful. Gauze-winged flies will sometimes succeed 
when others fail. The best time to fish for this trout is in the morning 
and early evening. It lurks in eddies and pools and at the foot of 
rapids or under overhanging banks, old stumps, or rocks. 
9. YeELLow Percu (Perca flavescens). 
The yellow perch has a wide eastern distribution. [It is common 
in the Great Lakes and the tributaries of the upper Mississippi River 
Fic. 9.—Yellow perch. 
and in coastwise streams and lakes from Nova Scotia to North 
Carolina. . 
In 1919 this fish was found by the senior author to abound in 
Goose and Feather Lakes in the park. Its presence there is appar- 
ently traceable to an unofficial, unauthorized plant made many years 
ago by a Montana citizen, who is said to have obtained a consignment 
of yellow perch from the State of Washington, into which State the 
species had been introduced some years before. 
In the park lakes the yellow perch attains a length of a foot and is 
most readily caught by the use of small spinners cast from shore and 
rapidly drawn in. Only a few of the park authorities have been 
aware of the occurrence of this fish in local waters. It can not be 
regarded as a desirable addition to the fish life of the park, and its 
spread to other waters than those now inhabited should be prevented. 
It is not usually reputed to be a game fish, and its voracious habits 
make it a menace to young trout. When fresh from cold water, it is 
gue of the best of pan fishes, being firm-meated and of delicious 
avor. 
