ANNUAL REPORT, 1938-39 27 



WHITEFISH, BASS and CLEAR LAKES, 



Township of Humphrey, District of Parry Sound, during the period January 23, 

 1939, to April 30, 1939. 



REMOVAL OF COARSE FISH 



Between December 16, 1938, and February 4, 1939, twenty-seven hoop nets 

 were operated for the removal of ling from waters located as follows: 



(a) In Leeds County — Rideau Lake, Bass Lake, Red Horse Lake, Outlet of 

 Charleston Lake and Barker's Creek. 



(b) In Lanark County — Bennett's Lake and the Tay River. 



The total number of ling taken was 3,305; the average weight of the ling was 

 .6 pounds, making the total weight of ling removed 19,830 pounds, or approximately 

 10 tons. 



BIOLOGICAL SURVEYS 



Biological surveys were conducted in Thunder Bay district on Northern Light 

 lake, located approximately twelve miles south of Moss township, on the Pigeon 

 river, Whitefish lake (Strange township). Arrow lake, located approximately six 

 miles south-west of Strange township, and Shikag lake, which is located about 

 seven miles north-east of Tannin. The purpose of these studies was to determine 

 the advisability of permitting commercial fishing on these lakes. Studies were 

 conducted on the following waters, with a view to determining their suitability as 

 sanctuaries for black bass, namely, — Hart lake, Stonehouse lake. Upper Rock lake, 

 Lower Rock lake, located in the township of Storrington, Frontenac county; Crow 

 lake (Crow's Nest lake) and Lake Opinicon, township of South Crosby, Leeds county; 

 and a water area in the vicinity of Portland, Big Rideau lake, township of Bastard, 

 Leeds county. 



Dams on the Beaver river, township of CoUingwood, Grey county, and at the 

 outlet of West Lake, township of Hallowell, Prince Edward county, were examined 

 with reference to the obstructions created by these dams to migratory fish, and 

 the biological effects resulting from changing water levels in the latter instance. 



Pollution surveys were conducted on a branch of the Aux Sables river, town- 

 ship of Usborne, Huron county; Smith creek, township of Blenheim, Oxford county, 

 and the St. Lawrence river, vicinity of Cornwall, Stormont county. 



The Ontario Fisheries Research Laboratory of the Department of Biology, 

 University of Toronto, continued field and laboratory studies of lakes and streams 

 in Algonquin Park during 1938-39, and the following is a concise account of this 

 important work: 



"The anglers fishing in the Park have cooperated by suipplying a record of 

 the fish which they caught. Such information is now available from a good many 

 lakes for the last four years. 



Year 



Number of lakes for which anglers have reported 

 Number of lake trout recorded 



In addition to recording the number of fish caught, the anglers also report the 

 size of the fish and the length of time it takes to catch a given number. It was 

 found that the length of the lake trout caught varied from a minimum of eight inches 



