FISHES OF THE YELLOWSTONE NATIONAL PARK. 25 
It is not impossible that confusion has arisen by brown trout from 
that lake having been propagated under the supposition that they 
were Loch Leven trout. There are parallel instances of such mistaken 
identity in this country in respect to other species, and so-called 
Loch Leven trout have been propagated for a long time in this 
country. In the early years the progeny of Loch Leven eggs could 
easily be distinguished from brown trout hatched at the same time, 
especially when they had attained a few inches in length. Recently, 
however, there is reason to suspect that many of the so-called Loch 
Leven plants have been brown trout. Be that as it may, trout 
under each name have been introduced into Yellowstone Park waters, 
and there are records of both having been subsequently taken. 
The first plants of this trout in the park were made in the upper part 
of the Firehole River in 1889. The next year Lewis Lake and 
Shoshone Lake were stocked, and in 1903 further plants were made 
in tributaries of the Firehole. 
The Loch Leven trout has been taken in the following park waters, 
in some of which it is abundant: Firehole River above and below the 
cascades, Madison, Gibbon, and Gardiner Rivers, Shoshone and Lewis 
Fig. 5.—Scotch lake trout: Loch Leven trout. 
Lakes and the “canal’’ connecting those lakes, upper Snake River 
waters, Heron Creek, and Duck Lake, near the Thumb of Yellow- 
stone Lake. 
Fish of large size and in great abundance were found in Duck Lake 
in 1919. Landlocked salmon had been planted in this lake in 1908 
and were reported to have survived and flourished, but none have 
ever been authentically identified, and it seems likely that the Loch 
Leven trout, the history of whose introduction into this lake is quite 
obscure, have been mistaken for landlocked salmon. Hundreds of 
fish were observed jumping at times, and a number of specimens up 
to 4 pounds in weight were taken in the summer of 1919 after a 
game fight. 
6. EUROPEAN Brown Trout; Von Breur Trout (Salmo fario). 
The brown trout is widely distributed in continental Europe and 
the British Isles, inhabiting lakes as well as streams, but it is the 
“brook trout” of the continental European countries. Under 
favorable conditions it is known to grow to over 20 pounds, but as a 
true brook trout it seldom registers over 1 pound in weight. 
The brown trout thrives in clear, cold, rapid streams and at the 
mouth of streams tributary to lakes, having much the same habits 
