. Bulletin. Natural history; Natural history. December, 1958 Bennett: Aquatic Biology 175 the warmouth was later published as an article of the Natural History Survey Bulletin (Larimore 1957). During the summer of 1950 Larimore, with the help of Leonard Durham and others, began an intensive investigation of the fishes in Jordan Creek, a small spring-fed, upland stream in Vermilion County. This project marked the be- ginning of upland stream investigations as a continuous program of the Section of Aquatic Biology. Through the use of the electric seine and other special equip- ment developed for
. Bulletin. Natural history; Natural history. December, 1958 Bennett: Aquatic Biology 175 the warmouth was later published as an article of the Natural History Survey Bulletin (Larimore 1957). During the summer of 1950 Larimore, with the help of Leonard Durham and others, began an intensive investigation of the fishes in Jordan Creek, a small spring-fed, upland stream in Vermilion County. This project marked the be- ginning of upland stream investigations as a continuous program of the Section of Aquatic Biology. Through the use of the electric seine and other special equip- ment developed for stream work, it has been possible to make both intensive and extensive studies on the ecology of stream fishes in the central Illinois region (Lari- more, Pickering, & Durham 1952). The smallmouth bass, Micropterus doloniieiii Lacepede, was found to be the most im- portant anglers' fish in these streams. The fry of this bass were particularly vulnerable to floods on streams when the floods were accompanied by sudden changes in water temperatures. The adult bass showed well-developed homing in- stincts as did some other species (Lari- more 1952). Tests of the value of plant- ing 6— to 8—inch smallmouths in a stream already containing a population of smallmouth bass demonstrated that it was possible to build up numbers of these fish only temporarily. Minnows removed from a stream with an electric seine were replaced by other minnows through mi- gration and reproduction within a period of a few months (Larimore 1955). Ap- parently streams are quickly repopulated even when fish are killed by drought con- ditions, heavy winter ice, or temporary severe pollution. In studies of ponds and lakes, by 1945 evidence had accumulated to substantiate the idea that a lack of fish predators was an important problem to be faced in the management of these waters. Obviously, fishing was no substitute for natural pre- dation, and much of the task of the fish manager was that of functioning
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