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DEPARTMENT OF FISH AND GAME 



CHEMICAL TREATMENT AND REHABILITATION OF LAKES 



The chemical treatment of lakes and reservoirs to rid them of rough 

 fish which have so overrun these waters that sport fishing is virtually 

 eliminated forms an important phase in the management of California's 

 inland waters. 



Incomplete kills have been obtained in some instances and further 

 knowledge is needed to insure total elimination of undesirable fishes. 

 Such incomplete kills and the reintroduction of rough fish by thought- 

 less anglers who use them illegally as bait means that many waters will 

 have to be re-treated periodically. 



Approximately 943 acres of lake area were chemically treated and 

 subsequently restocked with game fish during the biennium. Some of 

 the waters were reservoirs which had been drawn down considerably be- 

 low their normal levels, so that in effect a much greater amount of fish- 

 ing water was rehabilitated than is shown in the following tabulation : 



* Two and one-half miles of Robinson Creek were also treated on December 1, 1950. 



Repairs were made to the Miller Lake (Placer County) barrier dam, 

 which was damaged by the 1950 floods. 



FISH RESCUE 



The rescue of game fish from drying waters and their transfer to safe 

 waters is carried on as needed throughout the State. Unusual or isolated 

 cases are assigned to crews recruited from hatcheries or are cared for 

 by state wardens or sportsmen in cooperation with the Bureau of Fish 

 Conservation. In certain areas, however, extensive fish rescue is re- 

 quired each year and forms a regular part of the Bureau's program. 

 This holds true in some of the steelhead and salmon waters, and here 

 this work has been placed under the supervision of the biological staff. 

 The fish rescued are tabulated in Appendix 3. 



FISH INTRODUCTIONS 



The temptation to introduce some exotic species into a body of water 

 which is not producing angling up to expectations is alluring and great. 

 Indiscriminate introductions are fraught with danger, however, for the 



