PENNSYLVANIA (Cont. ) 



4. Studies on Establishing Rainbow Trout Runs in Pennsylvania Tributaries of L^ke 

 Erie. 



Experiments are under way to determine whether a significant run of rainbow trout 

 can be established into tributaries of Lake Erie through plantings of fingerlings. 

 One tributary has been closed as a nursery water and stocked with marked rain- 

 bow fingerlings. Seining is being conducted at intervals in the test stream and 

 records will be kept of individuals returning to spawn. 



Tributaries of Lake Erie; began August 1952, planned for 5 years; $200; Alfred 



Larsen, Project Leader. 

 Address correspondence to: Gordon L. Trembley, Chief Aquatic Biologist, 



Fisheries Research Lab. , Pa. Fish Commission, Bellefonte, Pa. 



5. Results of Experimental Trout Plantings in Lakes Holding Warm-water Fish Species. 



The project is set up to determine survival and catchability of various sizes of brook, 

 brown, and rainbow trout when planted in lakes containing warm-water fish 

 species. Investigations showed several lakes <?uitable for trout but which held 

 limited populations of bass, bluegills, yellow perch and other warm-water species. 

 Legal-size trout up to 20 inches were planted in spring and fall. Plantings of 

 fingerling trout will be tried. A complete creel census is being conducted on 

 one such lake. Test netting is being used on all of these lakes twice per year. 



Five lakes in northern Pennsylvania; began March 1952, to be completed November 



1954; $2,000 (except fish). 

 Address correspondence to: Gordon L. Trembley, Chief Aquatic Biologist, Fisheries 



Research Lab. , Pa. Fish Commission, Bellefonte, Pa. 



6. Marking Trout by Branding. 



A method of marking trout which is pernaanent and allows identification of the indi- 

 vidual fish is being tried in conjunction with selective breeding experiments to 

 positively identify brood stock. Wood-burning irons were used on several body 

 areas. Best results were obtained when branding was applied to dorsal surface 

 of head. Scar tissue formed is highly pignnented and characters are easily legible. 



Fisheries Research Lab. , Pa. Fish Commission, Bellefonte; began June 1951, 



planned for 5 years; $100. 

 Address correspondence to: Keen Buss, Fishery Biologist, Fisheries Research 



Lab., Pa. Fish Commission, Bellefonte, Pa. 



Industrial Wastes Division, Department of Health 

 1. Bio-assay Studies of Industrial Wastes. 



To evaluate the lethality of industrial wastes, their components and other water 



pollutants to fish. The evaluation, as deter mined by bio-assay procedures , offers 

 a reasonable judgment tool in administering effective stream pollution abatement. 



Fisheries Research Lab, Bellefonte; affiliated with the Industrial Wastes Lab. . 

 Harrisburg; in cooperation with the Pa. Fish Commission; began in November 

 1949, indefinite; Dr. C. S. Meyers and Thomas lezzi, Project Leaders, mimeo- 

 graphed reports available. 



Address correspondence to: Dr. C. S. Myers, Dept. of Health, Bureau of Sanitary 

 Engineering, Harrisburg, Pa. 



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