FISHES OF PENNSYLVANIA. "2 

Fischerei Verein, who was very active in the acclimation of the fish in 
America. 
Distribution.—The brown trout is widely distributed in Continental 
Europe and inhabits lakes as well as streams, especially in Norway and 
Sweden. Tributaries of the White Sea, the Baltic, the Black Sea and 
the Caspian, contain this species. In Great Britain it lives in lakes and 
streams and has reached a high state of perfection; in Germany and 
Austria, however, the trout is a characteristic fish and our supply has 
been drawn principally from the former country. Moreau found it at an 
elevation of 7,000 feet in the Pyrenees and a color variety is native to 
northern Algeria in about thirty-seven degrees north latitude. In the 
United States the brown trout has been successfully reared in Colorado 
at an elevation of nearly two miles above sea level. It is now well es- 
tablished in New York, Pennsylvania, Maryland, Missouri, Michigan, 
Wisconsin, Nebraska, Colorado and several other states. This trout has 
proved to be well adapted to the region east of the Rocky Mountains, 
which has no native black-spotted species, although the western streams 
and lakes contain many forms in a high state of development. 
Size.-—Under favorable conditions the brown trout has been credited 
with a weight of twenty-two pounds and a length of thirty-five inches. 
In New Zealand rivers, where it was introduced with unusual success, 
it now approximates equal size, but in most localities ten pounds is 
about the limit of weight, and five or six pounds is a good average, 
while in some regions the length seldom exceeds one foot and the weight 
ranges from one-half pound to one pound. In the United States a wild 
specimen, seven years old, weighed about eleven pounds. In a well in 
Scotland, an individual aged fifteen years, measured only about one foot 
in length. 'These illustrations will serve to show how much the growth 
of a brown trout is affected by its surroundings and food supply. The 
spe ies has been known to become sexually mature when two years old 
and eight inches long. 
Halnts.—The brown trout thrives in clear, cold, rapid streams and at 
the mouths of streams tributary to lakes. In its movements it is swift 
and it leaps over obstructions like the salmon. It feeds usually in the 
morning and ‘evening, is more active during evening and night, and 
often les quietly in deep pools or in the shadow of overhanging bushes 
and trees for hours at a time. It feeds upon insects and their larve, 
worms, mollusks and small fishes, and, like its relative, the rainbow 
trout, it is fond of the eggs of fishes. In Europe it is described as rising 
eagerly to the surface in pursuit of gnats and is said to grow most rap- 
idly when fed upon insects. 
Reproduction.— Spawning begins in October and continues through 
December and sometimes into January. The eggs are from one-sixth 
to one-fifth of an inch in diameter and yellowish or reddish in color. 
They are deposited at intervals during a period of many days in crey- 
