COLORADO (Cont. ) 



of identifiable plants of creel-size hatchery trout planted in the same lakes. 

 The various plants of trout were marked and a partial creel census was con- 

 ducted to obtain desired data on return to the creel and growth of the fish. 

 Limited limnological data was collected as a part of the study. 



Delta County; began 1953, to close 1957; $2, 000; P. T. Barrows, Leader; 

 reports available. 



Address inquiries to: As in No. 1 above. 



4. Channel Catfish Inventory and Transplanting Operation 



The objectives are to determine the abundance of channel catfish available 

 in western Colorado streams and to crop off as many fish as possible where 

 they are most numerous for transplanting in other waters of the State. A fish 

 toxicant will be used to collect the fish. Some success has been obtained by 

 applying fish toxicants to the streams in small quantities, rescuing the fish 

 and placing them in clean water for recovery. 



Dolores and San Juan Rivers; began August 1956, closed December 1956; 

 $1,250; T. M. Lynch, Leader; reports available. 



Address inquiries to: T. M. Lynch, Colorado Game and Fish Department, 

 1530 Sherman Street, Denver, Colorado. 



5. Exotic Fish Inventory 



The objective is to determine the survival, growth, and reproductive 

 success of walleye, white bass, drum, northern pike, and redear sunfish 

 which have been planted in Colorado waters during the past few years. 



The posoibilities of establishing an artificial spawn taking program for 

 walleyes at Bonny Reservoir, Yuma County, are investigated also. 



Statewide; began January 1956, closed December 1956; $5,280; Robert 

 Jones and Donald Nolting, Leaders; reports available. 



Address inquiries to: T. M. Lynch, as in No. 4 above. 



6. Experimental Use of Fingerling Rainbow Trout in Streams 



The objective is to obtain data on the survival and growth of plants of 

 hatchery-reared 2-inch rainbow trout made in stream sections where previous 

 census had shown naturally produced trout to be scarce or absent. An elec- 

 trical shocking device was. used to inventory the trout population in a nunnber 

 of Colorado streams. In three locations where naturally produced fingerling 

 trout were absent or scarce, plants of marked hatchery-reared rainbow trout 

 were made. Follow-up inventories by means of an electrical shocking device 

 made in the fall of the year of the plant (fish were planted in June or July) and 

 in the spring and fall of the following year provided information on the growth 

 and survival of the 2-inch marked fish. The work was regarded as preliminary 

 in nature. Depending on the results obtained, further experimental work using 

 fingerling trout in streams was to be conducted. 



Williams Fork, Eagle River, and Colorado River; began June 1954, closed 

 July 1956; $200; W. D. Klein, Leader. 



Address inquiries to: W. D. Klein, Colorado Game and Fish Department, 

 1530 Sherman, Denver, Colorado. 



7. The Development of New Fishing Lakes 



The objective is to develop additional good fishing lakes available for free 

 public fishing. Practically all of Colorado's Dingell- Johnson funds are spent 

 on lake development projects. Suitable sites on Federal lands in the mountain- 

 ous sections of the state offer the best possibilities for development and have 

 been used extensively to date. Prior water commitments of various types 

 (interstate compacts, local domestic and irrigation rights, etc. ) offer many 



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