Fishes . no appreciable importance, is shownby the almost al)solute identity of the fish fauntc of Lake Winne-bago and Lake Champlain. While many large fishes rangefreely up and down the Mississippi, a majority of the speciesdo not do so, and the fauna of the upper Mississippi has morein common with that of the tributaries of Lake Michigan thanit has with that of the Red River or the Arkansas. The in-fluence of climate is again shown in the paucity of the faunaof the cold waters of Lake Superior, as compared with thatof Lake Michigan. The majority of our species cannot endurethe cold. In gener
Fishes . no appreciable importance, is shownby the almost al)solute identity of the fish fauntc of Lake Winne-bago and Lake Champlain. While many large fishes rangefreely up and down the Mississippi, a majority of the speciesdo not do so, and the fauna of the upper Mississippi has morein common with that of the tributaries of Lake Michigan thanit has with that of the Red River or the Arkansas. The in-fluence of climate is again shown in the paucity of the faunaof the cold waters of Lake Superior, as compared with thatof Lake Michigan. The majority of our species cannot endurethe cold. In general, therefore, cold or Northern waters con-tain fewer species than Southern waters do, though the num-ber of individuals of any one kind may be greater. This isshown in all waters, fresh or salt. The fisheries of the Northernseas are more extensi\-e than those of the tropics. There aremore fishes there, but they are far less varied in kind. Thewriter once caught seventy-five species of fishes in a single. Flu. To.—Peristedion miniatum Goode and Bean, a decp-rcil colored oftlie depths of the Gulf Stream. haul of the seine at Key West, while on Cape Cod he obtainedwith the same net but forty-five s]:)ecics in the course of a weekswork. Thus it comes that tlic an^jjler, contented with manyfishes of few kinds, goes to Northern streams to fish, while thenaturalist goes to the South. But in most streams the difference in latitude is insignificant,and the chief differences in temperature come from differencesin elevation, or from the tlistance of the waters from the coldersource. Often the lowland waters are so diffcrent in characteras to produce a marked change in the quality of their lowland waters may form a barrier to the free movements Barriers to Dispersion of River Fishes 109 of upland fishes; but that this barrier is not impassable isshown by the identity of the fishes in the streams * of the uplandsof middle Tennessee with those of the Holston and FrenchB
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