1938 FISH CENSUS OF SPORTSMEN'S LAKE 



Sportsmen's Lake was poisoned on May 20, 1938. The open water was treated from a 

 boat between 9:45 and 10:30 a.m. Between 10:30 a.m. and noon, a garden sprayer was used 

 to distribute poison along the edges and -In the narrow channels. The fish began to 

 appear soon after the first poison was Introduced and by noon the fish listed In table 3 

 had been collected, sorted and counted. 



Although the poison may not have been distributed uniformly, the list In table 3 

 shows. In some measure, the fish that are most easily killed. The surface water 

 temperature was 70 degrees Fahrenheit. 



It required three days to handle the fish. The procedure was the same as that 

 described In Lake Management Reports, 2. Fork Lake near Mount Zlon, Illinois, published 

 by the Natural History Survey as Biological Notes No. 9, January, 1939, 



When we returned to the pond on June 2, It was reported that some fish had escaped 

 the first poisoning. Next day we saw three fish ;)ump. On June 14 the lake was 

 repolsoned with twice the original dosage, 1 pound of poison per acre foot of water. 

 This repolsonlng was begun at 2 p.m., and before dark 7 largemouth bass and 20 redmouth 

 buffalo were collected. The following day, 13 bass, 7 crapples, 3 bullheads, 1 sheeps- 

 head, 1 qulllback and 35 redmouth buffalo were picked up. These fish were large and 

 had evidently survived the first poisoning. Table 4 shows the percentage and sizes of 

 fish escaping the first poisoning. At the time of the second poisoning, large numbers 

 of redmouth buffalo fry and somewhat smaller numbers of largemouth bass and black bull- 

 head fry were killed. These fry ranged between one-half and li Inches In length and 

 had been spawned since the first poisoning on May 20. 



TABLE 6.— FREQUENCIES OF STANDARD LENGTHS OF FISHES 

 (EKCEPT LARGEMOUTH BASS) IN SPORTSMEN'S L/iKE, MAY-JUNE, 1938. 



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