406 



Illinois Natural History Survey Bulletin 



Vol. 23, Art.] 



of 1939 and 1940, and April, May and 

 June of 1941, The fishing intensity was 

 light in 1938 (end of the season), but for 

 the 1939 season it was 1,414.9 man-hours 

 per acre; for 1940, 1,647.3 man-hours per 

 acre; and, for April, May and June of 

 1941, 634.0 man-hours per acre. Hook- 

 and-line fish yields were, for 1939, 349.95 

 pounds per acre; for 1940, 142.5 pounds 

 per acre; and, for 3 months of 1941, 70.9 

 pounds per acre. Hoopnet sampling of 

 August 28-30, 1938, compared with 

 catches made with nets July 10-15, 1940, 

 indicated a reduction in the population of 

 large-sized fish between these two sam- 

 pling periods. 



3. A poison census was made on June 

 24, 1941. At this time the lake contained 

 9,171 fish weighing 442.17 pounds. The 

 kinds of fish present were largemouth 

 bass, black crappies, bluegills, warmouth 

 bass, green sunfish, yellow bass, black bull- 

 heads, yellow bullheads and golden shin- 



ers, as well as one carp, one common sucker 

 and one blunt-nosed minnow. ^ 



4. Fish were relatively stunted during 

 the first year of life, but most species grew 

 at an exceptionally rapid rate during later 

 years. The oldest fish were in their sixth 1 

 summer of life, and nearly all of these 

 were largemouth bass. Most of the fish 

 were taken when in their third summer. 



5. A large population of black crappies 

 had been reduced to 22 fish by the time of 

 the final census. This reduction was 

 apparently not due to hook-and-line fish- 

 ing. Largemouth bass and bluegills re- 

 mained numerous, although they had made 

 up an important part of the hook-and-line 

 catch. 



6. In spite of heavy fishing, the natural 

 spawn of fish was obviously sufficient to 

 insure replacement of those fish removed, 

 and under reduced fishing intensity the 

 lake would have returned to its former 

 carrying capacity. 



LITERATURE CITED 



II 



Beckman, William C. 



1941. Increased growth rate of rock bass, Ambloplites rupestris (Rafinesque), following reduc- 

 tion in density of the population. Am. Fish. Soc. Trans. 70:143-8. 

 Bennett, George W. 



1937. Tl^e growth of the large mouthed black bass, Huro salmoides (Lacepede), in the waters 



of Wisconsin. Cope. 1937(2) :104-18. 6 figs. 

 1943. Management of small artificial lakes, a summary of fisheries investigations, 1938-1942. 

 III. Nat. Hist. Surv. Bui. 22(3) :357-76. 7 figs. 

 Bennett, George W., David H. Thompson and Sam A. Parr 



1940. Lake management reports. 4. A second year of fisheries investigations at Fork Lake, 

 1939. 111. Nat. Hist. Sqrv. Biol. Notes 14. 24 pp., 10 figs., 4 pis. 



Cooper, Gerald P. 



1936. Age and growth of the golden shiner (Notcmigonus crysoleucas auratus) and its suita- 

 bility for propagation. Mich. Acad. Sci., Arts and Letters Papers 21:587-97. 3 figs. 

 Eschmeyer, R. W., and Alden M. Jones 



1941. The growth of game fishes in Norris Reservoir during the first five years of impound- 

 ment. N. Am. Wildlife Conf. Trans. 6, 1941:222-40. 4 figs. |M| 



Hubbs, Carl L., and Gerald P. Cooper ^ 



1935. Age and growth of the long-eared and green sunfishes in Michigan. Mich. Acad. Sci., 

 Arts and Letters Papers 20:669-96. 5 pis. 

 Schloemer, Clarence Louis 



1939. The age and rate of growth of the bluegill, Helioperca macrochira (Rafinesque). Doc- 

 toral Dissertation, University of Wisconsin. jH 



Schoffman, Robert J. "" 



1940. Age and growth of the black and white crappie, the warmouth bass, and the yellow 

 bass in Reelfoot Lake. Reelfoot Lake Biol. Sta. Rpt. 4:22-42. 9 figs. 



Swingle, H. S., and E. V. Smith 



1943. Factors affecting the reproduction of bluegill, bream and largemouth black bass in 

 ponds. Ala. Ag. Exp. Sta. Circ. 87:1-8. 

 Thompson, David H., and George W. Bennett 



1939. Lake management reports. 3. Lincoln Lakes near Lincoln, Illinois. 111. Nat. Hist 

 Surv. Biol. Notes IL 24 pp., 8 figs. 



I 



