42 DEPARTMENT OF GAME AND FISHERIES No. 9 



The distribution of speckled trout was more than twice that of the previous 

 year, and our objective for next year is to distribute in the neighbourhood 

 of five million fingerlings. 



RAINBOW TROUT 



More than twice as many rainbow trout fingerlings were distributed in 

 1930 as in 1929; ten thousand yearlings were also distributed. It should be 

 stated that no general distribution is anticipated, but a controlled distribution is 

 under way, and the plantings made will be followed up in order to determine the 

 most satisfactory basis for future stocking. The experimental work so far 

 includes the following waters: 



1. The waters of Bronte creek, Halton county, a stream in the agricultural 

 section of southern Ontario, which at present is almost barren of trout and whose 

 lower reaches are not suitable on account of high summer temperatures, were 

 planted with rainbow trout. Waters of this type are impounded by dams, but 

 it is alleged by certain authorities that, in view of the absence of fishways, in 

 the second or third year the trout will migrate to the lake and be lost permanently 

 to the stream. The rainbow trout introduced so far have done exceptional/ 

 well, and the work is worth while from the experimental standpoint, though no 

 other striking results accrue, to determine what will actually happen to rainbow 

 trout carefully planted in waters of this character and whether domesticate J 

 stock will show any depressed migratory- instinct, such as is shown by the Pine 

 River (Simcoe county) breed. 



2. Rainbow trout were planted in Stoney creek, a tributary of the Coldwater 

 river, Simcoe county. This is a spring stream that does not contain speckled 

 trout but is suitable for them and is cut off from the speckled trout system by an 

 impassable barrier. If the planting be successful, the lower reaches of the main 

 stream will become stocked. 



3. Rapid river, Geneva creek. Windy creek, and Pumphouse creek, large, 

 cold, spring-fed streams in Sudbury district, northern Ontario, were planted with 

 rainbow trout. 



4. Rainbow trout were introduced into Lake Simcoe and other landlocked 

 lakes of large area containing lake trout in the main body of the lake and speckled 

 trout in the streams, a few of the latter being available for spawning by the 

 rainbow trout, but the majority cut off by impassable dams. A very careful 

 biological study was carried out on Lake Simcoe, and the possibilities for rainbow 

 trout appear to be very favourable. Yearling trout of large size were introduced 

 into the main body of the lake at various points around its circumference and 

 also into Brough's creek, a suitable trout stream giving direct and natural access 

 to and from the lake. Late fingerlings were also distributed in suitable parts of 

 the stream, which is closed to all fishing, thereby giving the fish a better oppor- 

 tunity to become established and to reproduce their kind without interference. 

 This experiment will also be the means of determining the efifect of the introduc- 

 tion of rainbow trout on the native brook trout in the stream. 



BROWN TROUT 



The stocking policy for brown trout was outlined in the previous report and 

 will be adhered to until more information on the subject is obtained through 

 biological surveys. 



Seventy thousand fingerlings were introduced into a number of suitable lake- 

 trout lakes in Kenora district to determine whether they will thrive in lakes in 

 that district, since trout streams are either negligible or non-existent there. 



