CHAPTER IX 

 FISH CONTROL 



ADVANTAGES AND LIMITATIONS 



There is no doubt that fish control, where it is applicable, is one 

 of the cheapest and most satisfactory methods of fighting the 

 mosquito. Once a natural breeding-place, such as a lake or 

 stream, is stocked with the proper kind of fish, about the only 



(Photo by E. B. Johnson, C. E.) 

 Fig. 115. — Perfect fish control at a log pond in Alabama. 



work required to maintain their efficiency is occasional cleaning 

 of its edges. In certain artificial breeding-places, such as foun- 

 tains, underground cisterns, etc., even this is not required. 

 Even where such cleaning is necessary, it has been the writer's 

 experience, however, that, in the long run, fish control is often 

 cheaper and easier than oiling or ditching. In some places, such 

 as large, shallow ponds, water-filled clay-pits, etc., fish control is 

 about the only solution, since often it is not possible to drain such 

 places, while weekly oiling of large water-surfaces quickly runs 



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