52 DEPARTMENT OF GAME AND FISHERIES No. 9 



diminution of the oxygen supply and to pollution of the water, on account of 

 the small volume carried. 



Hatchery ofificials are responsible for the effective transportation and 

 planting of all classes of fish and are directed in their efforts by the Biological 

 and Fish Culture Branch of the Department of Game and Fisheries. 



Eleven hundred and ninety-two shipments of fish were made during the year, 

 and of these only five reached their destinations in poor condition. 



PLANTING OF FISH 



Hatchery officials are responsible for the planting of fish of all species, acting 

 under requisitions and definite instructions from the Branch. 



Nevertheless, the Branch advises applicants regarding the necessary 

 technique required in planting operations, on requisitions issued. 



Successful planting depends on the knowledge of the requirements of the 

 fish, and this may be obtained only by close observation and study of the life- 

 history of each species. Dr. Lawson Hart and Dr. Andrew Pritchard, formerly 

 of the Department of Biology, University of Toronto, have made special contri- 

 butions to the knowledge of the life-history of the whitefish (Coregonus clupea- 

 formis Mitchill) and the herring (Leucichthys artedi), respectively, by studies 

 carried out on the Bay of Quinte, Lake Ontario, under the auspices of the 

 Fisheries' Research Laboratory of the Department of Biology, University of 

 Toronto. The information, which is of an exact kind and the result of inquiry 

 over a considerable period of time, gives a clue to the most suitable location in 

 which to deposit whitefish and herring fry. 



Mr. J. H. Fox, Science Master, Windsor Collegiate Institute, commenced 

 an investigation during the year under the direction of the Director of the 

 Branch regarding the most suitable natural environment for lake trout fingerlings. 

 Lake trout fingerlings were placed in wire cages, 15 by 12 by 8 inches, in various 

 positions in Lake Ontario, opposite Port Bowmanville, and examined once a 

 week to determine the percentage of mortality. At the same time water samples, 

 plankton, temperature records, and bottom fauna were taken in the vicinity of 

 the cages. 



The first series of experiments showed that in an unprotected cage, water 

 currents, as a controlling factor in mortality, overshadow all other factors. 



In the second series of experiments the effect of currents was largely 

 eliminated by using cages with a band of galvanized iron around four sides, 

 leaving only the top and bottom open, and instead of being suspended, the cages 

 were allowed to rest on the bottom. By such an arrangement the effect of 

 strong water currents was minimized. 



The experiments indicated that the smallest daily mortality among lake trout 

 fingerlings occurs at a depth of 24.5 metres (80.4 feet). 



More prolonged experiments, using larger numbers of fish, may be under- 

 taken by the Branch in 1931. 



CLOSED WATERS 



The following waters are closed to all fishing: 



Bass Lake, townships of Purdom and Booth, district of Thunder Bay; indefinite closure by 



Order-in-Council of April 29th, 1930, for bass propagation. 

 Beryl Lake, north half of section 26, township of Yankoughnet, district of Algoma; closed until 



May 1st, 1931, by Order-in-Council of December 20th, 1927. 

 Brough's Creek, township of South Orillia, county of Simcoe; closed until June 2nd, 1934, by 



Order-in-Council of August 14th, 1930, for rainbow trout propagation. 



