directs his research toward increasing the number of 

 fish and the quality of the fish raised in the hatchery 

 with the final objective of the fisherman being able 

 to catch more fish in our natural and impounded 

 waters, and to do it regularly. 



Of the many biological approaches to develop 

 better sport fishing, four are preeminent. They 

 include disease studies, nutritional research, edu- 

 cation of the public against excessive use of pesti- 

 cides, and study of stream stocking problems. 



The disease research program includes not only 

 a study of plagues, which can ruin a year*s output 

 of a hatchery in a matter of hours, but also the 

 training of personnel in diagnoses of hatchery di- 

 seases and the providing of technical aid to State and 

 private hatcheries when an epidemic starts. Re- 

 search of this type is being carried on at the Eastern 

 Fish Disease Laboratory, Leetown, W. Va., and the 

 Western Fish Disease Laboratory, Seattle, Wash. 



Nutrition studies at Cortland, N. Y., and Willard, 

 Wash., are resulting in more pounds of hatchery 

 fish for a given amount of food fed. These studies 

 also increase our fund of knowledge on the nutri- 

 tional requirements and biochemistry of wild popu- 

 lations of fish. Cutting down disease losses and 

 producing more pounds of fish per dollar are im- 

 portant items to sportsmen in all parts of the country. 



But if the fish so saved and developed are to be 

 lost because they were planted at the wrong time, 

 in the wrong place, or under wrong conditions, then 

 the advances made in disease and nutrition are lost. 

 Hence, there is a continuing study on how to plant 

 fish to assure maximum survival. This research 

 naturally leads to another phase of research--how to 

 meet the problem of the misuse of pesticides. Studies 

 are underway to determine the kinds of pesticides 

 which will do the task the farmer needs done with 

 a minimum loss of fish and wildlife. Still more studies 

 are being carried on to ascertain the proper time 

 and the conditions for applying pesticides. 



The Appalachian Sport Fishery Investigations at 

 Leetown, W. Va., and the Rocky Mountain Sport 

 Fishery Investigations in Logan, Utah, are working 

 on experimental management programs on trout 

 waters of National Parks. The California-Nevada 

 Sport Fishery Investigations at Reno, Nev., concen- 



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