44 DEPARTMENT OF GAME AND FISHERIES No. 9 



effective in the lakes of northern Ontario and Georgian bay, where male bass 

 may still be guarding their nests on and after July 1st. 



One strong means of protection is by educating the public and obtaining 

 their support in a campaign to protect the male bass while they are guarding 

 their netts, and also to follow the law as set forth in the regulations. 



2. Closure. — Depleted waters may become rehabilitated by closure and the 

 introduction of parent bass. 



3. Harvesting. — The harvesting of bass from productive bass lakes, although 

 robbing one lake to feed another, is an additional means by which restocking 

 of depleted waters may be effected. 



During the open season the following bass lakes were tested by hatchery 

 officers by the use of trap nets and seines to determine their suitability as bases 

 of supply for bass fingerlings and yearlings: 



Green lake, Brougham township, Renfrew county. 



Cocwayong lake, near Donald, Haliburton county. 



Cat lake, Blair township, Parry Sound district. 



Herridge lake, townships of Strathcona and Law, Nipissing district. 



Bass lake, Purdom and Booth townships. Thunder Bay district. 



Fox lake, 12 miles from Kenora, Kenora district. 



All the lakes named, with the exception of Cocwayong lake, are closed to all 

 fishing (see list of closed waters on pages 53, 54, and 55). 



Bass lake in Thunder Bay district and Cat lake in Nipissing district, 

 require time to recuperate from the drain to which they were subjected during 

 the years previous to closure before any results from harvesting will be apparent. 

 The latter is suitable for bass propagation, as shown by biological survey. 



Herridge lake, Nipissing district, is suitable as a base of supply for adults, 

 which may be introduced into depleted waters prior to their spawning season. 

 On account of the steep declivity of the shores, it is not suitable for seining out 

 fingerling bass. It is quite possible, however, from the past year's observations, 

 to collect bass fry in large numbers when they rise from their nests. 



Green lake, Renfrew county, yielded 1,192 yearlings and two-year-old 

 small-mouthed black bass by harvesting; it is an exceptionally fine lake from 

 which to obtain a supply of bass. 



Cocwayong lake, Haliburton county, yielded 2,500 small-mouthed black 

 bass from 2 to 8 inches in length. 



Fox lake, Kenora district, yielded 340 small-mouthed black bass from 2 to 

 12 inches in length. It may be noted that bass were not originally native to 

 Fox lake; it was stocked with fingerling small-mouthed black bass by the 

 Department in 1913 and 1915. 



Pond Culture 



Lake on the Mountain. — The small-mouthed black bass introduced into the 

 Lake on the Mountain nested naturally on the gravel nests provided, and 123,000 

 small-mouthed black bass fry were collected and introduced into protected areas 

 (among aquatic vegetation in shallow water) -of suitable small-mouthed black- 

 bass lakes, in the county of Prince Edward and neighbouring counties. 



Ingersoll Pond. — Provision has been made under lease for a suitable rearing 

 pond for bass at Ingersoll, Ont. The pond covers an area of approximately 

 twelve acres and is so constructed that it may be drained. The satisfactory 

 drainage of such a large pond is one of the difficulties with which we have to 

 contend, and for this reason smaller rearing ponds are preferable. 



