. Bulletin. Natural history; Natural history. 76 Illinois Natural History Survey Bulletin Vol. 27, Art. 1 Pit, mentioned in connection with another experiment. Broods of warmouths were produced in each of these two summers and the two followinji summers that the study was continued. The male hluegills built nests, but no warmouthXbluegill minnow population and grow well when they become large enough to utilize the minnows as food. Largemouth bass in a pond with war- mouths apparently grow faster and pro- duce better fishing than do smallmouth. Fig. 27.—North arm of Dunmire Pond, Woodford Count
. Bulletin. Natural history; Natural history. 76 Illinois Natural History Survey Bulletin Vol. 27, Art. 1 Pit, mentioned in connection with another experiment. Broods of warmouths were produced in each of these two summers and the two followinji summers that the study was continued. The male hluegills built nests, but no warmouthXbluegill minnow population and grow well when they become large enough to utilize the minnows as food. Largemouth bass in a pond with war- mouths apparently grow faster and pro- duce better fishing than do smallmouth. Fig. 27.—North arm of Dunmire Pond, Woodford County, stocked with warmouths, large- mouth bass, and male bluegills. hybrids were collected. This half-acre pond, in which a substantial warmouth population had been developed, should have offered a desirable situation for hy- brid production. General Conclusions About Spe- cies Combinations.—Several general conclusions may be drawn from the pre- liminary observations on these experimen- tal populations. Usually when sexually mature warmouths are released in a pond before the middle of August, they will pro- duce a brood the same summer. In estab- lished warmouth populations, a high pro- portion of each new brood is spawned so late in the season that the fish are too small in their second summer of life to reproduce then. Small numbers of war- mouths when introduced into a pond over- crowded with other sunfish seem unable to establish a population. Warmouths repro- duce successfully in the presence of a large bass in a pond with warmouths. There is little difference in growth rates be- tween warmouths that develop in a pond with largemouths and those that develop in a pond with smallmouths. Warmouths will not establish a large enough popula- tion to support angling and materially reduce the survival of young bass unless adult warmouths are introduced a year be- fore adult bass are added, or unless fin- gerling bass, instead of adults, are intro- duced with the adult warmouths.
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
