20 DEPARTMENT OF GAME AND FISHERIES No. 10 



of small portions of the headwaters. They have also been planted in lake 

 trout lakes with and without tributary spring creeks. Reports indicate 

 that the distributions of brown trout in Muskoka waters are beginning to 

 show promising results. In the Muskoka lakes watershed care has been 

 taken to avoid planting "browns" in waters where native speckled trout 

 abound and where conditions are suitable for them. 



Rainbow Trout 



Distribution of rainbow trout was confined largely to the waters of 

 Lake Simcoe and its tributaries in an effort to establish the species. It is 

 too early to make a definite pronouncement regarding the establishment 

 of this species in the waters in which they have been distributed during 

 the past few years, but by means of follow-up studies by further biological 

 surveys, definite information in this respect may be obtained. 



The officials of the Branch are of the opinion that the heavy northern 

 streams tributary to large bodies of water are apparently the most suitable 

 planting locations, on account of the success achieved, by their original 

 introduction to the St. Mary's river, from which they have spread along 

 the north shore of lake Superior and penetrated the lower reaches of streams 

 adjacent thereto. On account of the migratory habits of the species, 

 streams having natrual or artificial barriers are considered detrimental, 

 either to theii permanent establishment or to their return for spawning 

 purposes to the streams in which they were originally planted. vStreams 

 having unimpeded connection with larger portions of the same stream or 

 larger bodies of water are preferable for planting purposes. 



As a result of proper study and research, a race may be found in 

 nature with depressed migratory habits, such a race abiding more per- 

 manently in suitable rivers and streams by choice rather than necessity. 

 This race would form the basis for additional pond cultural operations. 



Lake Trout 



Satisfactory progress was made during the year in connection with the 

 hatchery production and distribution of lake trout eyed eggs, fry and 

 fingerlings; 1,153,900 more lake trout fry and fingerlings were planted in 

 1933 than in the previous year. Distribution to the Great Lakes amounted 

 to 16,257,500 fry and fingerlings, to other commercially fished waters 

 300,000 fingerlings and to game-fish waters 855,200 fingeilings. A drive 

 to increase the quantities of fingerlings planted in inland waters has met 

 with success and will be pushed as far as economic conditions will permit. 



The lake trout is not only sought after by anglers, but is also an 

 important commercial commodity of the Great Lakes. In lake Superior, 

 lake Huron and the Georgian Bay, the total annual production recently 

 was over 3,500,000 pounds and in each of these waters the commercial 

 production of the species exceeds that of the commercially important 

 whitefish. 



vStudies made by the Branch in connection with the planting of lake 

 trout indicate the best depths and general limnological conditions suitable 

 for planting. These planting methods, if carefully followed, should yield 

 fruitful results. 



Whitefish 



The whitefish is a commercial commodity of outstanding importance 

 and of predominant importance from the standpoint of production in the 

 Great Lakes, especially Georgian Bay and lake Erie. 



