used. Subsequent work has shovm no evidence that any fish survived this treatment. 



The poison was applied at 5:50 p.m., June 7, 1938. Within 15 minutes six fish were 

 seen struggling at the surface of the water. As many more were seen within the next 

 10 minutes. In addition to several hundred Inch-long buffalo fry that were dying. 

 Within an hour redmouth buffalo and carp were gasping at the surface and the smaller 

 kinds of fishes were dying rapidly. Before dark, three men had gathered up 748 black 

 bullheads, 16 large buffalo and 3 carp. 



When fish have been poisoned some of them float and can be picked up Immediately, 

 but a good share of them sink. In turbid water, or In deep water, dead fish cannot be 

 gathered up until they bloat and rise to the siorface. The surface of the lake was 

 entirely cleai*ed of fish each day for four days after the dose of poison. The numbers 

 of each of the Important species handled each day are shown In table 2. All of the 

 fish handled after the f li*st day had risen fi-om the bottom of the lake. 



TABLE 2.- 



-NUMBERS OF FISHES RISING TO THE 

 SURFACE EACH DAY AFTER POISONING 



Twenty-two hours after the poison was applied collections were made with dip nets 

 and minnow seines to find out whether other animal life had been affected. Samples were 

 taken from the northwest shore of the pond (where the concentration of poison was 

 highest) and from mud dipped frcm deep water. The numbers and kinds of living and dead 

 Invertebrates are given In table 3. The poison In the Concentration used seems to be 



TABLE 3.--^INDS AND NUMBERS OF AQUATIC INVERTEBRATES 



specific for fish. Most of the Invertebrates were unaffected, and even glll-breathlng 

 vertebrates other than fish, such as frog tadpoles, survived. 



