Feyerherm, Harvey A.
M.S. (Master of Science)
Department of Biological Sciences
The brown trout may be considered as the "fish that saved trout fishing" in many streams in our country. As the western movement grew, many fields around rivers and streams were cleared of surrounding tress, thus destroying shade and watersheds. River and stream temperatures rose so that the native trout, primarily the brook trout, found it difficult to survive. Besides high temperatures, silt from farm lands washed into the rivers and played havoc with developing eggs and fry. Increased industrial development, usually with little consideration of wildlife conservation, caused waste to be dumped into the rivers, this action causing serious depletions in trout populations. American conservationists, realizing the seriousness of the depletion problem as early as 1883, imported brown trout eggs from Germany. The eggs were sent by a scientist, von Behr, then president of the German Fishery society, to a station in Northville, Michigan. In March, 1884, after the eggs had hatched, the fry were placed in a branch of the Pere Marquette River in northern Michigan. Later a subspecies of brown trout, known as Loch Leven trout, was imported from Scotland. The two species of imported trout have interbred to such a high degree that all efforts to distinguish between the two species are practically futile. It is now common to refer to the brown trout as a single species. Experimental work involving brown trout began seriously in the 1930's. This paper, as an introduction to the brown trout, will cover sons of the biology of this species.
Kolar, Ronald Joseph, "An introduction to brown trout" (1955). Graduate Research Theses & Dissertations. 1336.
Northern Illinois University
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