In addition, mineral analyses of 28 samples were carried out to determine the 

 suitability of specific waters for domestic use. 



In total, 765 water samples were analysed by OWRC for the Department of 

 Lands and Forests during 1965. 



2. N I COLSTON DAM FISH WAY 



In the spring of 1965, the Nicolston Dam Fishway was again operated. All 

 rainbow trout captured were measured, examined for lamprey marks, sexed, and 

 scale samples were taken for age determination. Prior to release, each trout was 

 marked by attaching to the base of the dorsal fin a plastic streamer type tag. 



From April 2 to May 9, 1965, a total of 289 rainbows were captured; of 

 these, 16 were recaptures. Where sexing was possible (which was in almost all 

 instances), 51 were males and 234 females, resulting in a sex ratio of one male to 

 4.59 females. Only three rainbow were found with lamprey marks. 



The fall operation in 1965 was not successfully carried out. A transfer of 

 officers resulted in a delay and the main run was missed with the result that only 

 eight rainbows were tagged. 



Because of the publicity that the fishway has been receiving and through our 

 own efforts to teach anglers to return all tags, the number of tag returns has been 

 fairly high. 



3. MISSISSIPPI LAKE 



The co-operative study of the walleye population in Mississippi Lake between 

 the local association and the department continued in 1965. A total of 337 walleye 

 were measured, scale sampled, tagged and released, and approximately four million 

 eggs were collected and forwarded to the White Lake hatchery for incubation. 

 About 300 cottages and tourist cabins were provided with creel census cards for 

 the season. 



4. CHARLESTON LAKE (KEMPTVILLE DISTRICT) 



The first of a proposed annual study, for a period of three or four years, was 

 begun in the fall of 1965. A total of 176 lake trout were captured, measured, 

 scale sampled, tagged and released. Determinations of spawning depths were 

 recorded by scuba divers. Information was also collected on largemouth bass. 



5. WALLEYE STUDY (TWEED DISTRICT) 



This is a long term study that was begun in 1961 and has been carried on 

 annually to determine if a walleye sport fishery can be maintained on small inland 

 lakes by means of hatchery stocking. The four lakes currently being used in the 

 study are located in Frontenac County and are as follows: Big Clear, Kash- 

 wakamak, Mississagagon and Plevna. 



In October of 1965, 2,030 walleye fingerlings about four inches in length 

 were marked and planted in Mississagagon Lake. Trap net surveys were carried 

 out on Big Clear, Kashwakamak and Mississagagon during July and August. 

 Plevna Lake was included in this list during August. Boat counts were made over 

 the lakes from an aircraft to determine the proportion of the boats on each lake 

 which are contacted during the roving creel census. 



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