28 REPORT OF THE Xo. 3 



Commercial Fishing Investigations 



1. Baited Hook Lines — Lake Erie and Lake St. Clair 



Investigations were carried out during the summer to determine the effect, 

 beneficial or otherwise, of the baited hooks, especiall}' catfish hooks, on (a) 

 angUng (b) other commercial fishing. The results of this investigation would 

 indicate that this is a suitable method for taking catfish and bullheads and does 

 not interfere, in general, with either angling or other commercial fishing. 



The investigation in Lake St. Clair, where both catfish and sturgeon hooks 

 are fished, indicated the desirabilitA" of issuing onh- one licence to cover the taking 

 of both species of fish, rather than a separate licence for each species. 



2. Trout Hooks — Georgian Bay 



Some investigation of the operation of trout hooks in Georgian Bay was 

 carried out but insufficient information was obtained to warrant the drawing of 

 an>' conclusion. 



3. Blue Pickerel and Perch Fishiytg — Lake Ontario 



A short stud\ of this industry was made and the information obtained, 

 while very limited, has ])roved valuable and indicates the size of mesh suitable 

 for taking these fish in gill nets. 



Pollution Investigations 



The following waters were examined with reference to possible ix)llulion 

 Laurel Stream at \\'aterloo 

 Gengrich Stream at Baden 

 Canagagigue Stream at Baden 

 Speed River near Hespeler 

 Spanish River near Espanola 

 Seine River in Rainy Ri\er District 

 Nith River at Xew Hamburg 

 vSt. Lawrence River near (^ornwall 

 Xation Ri\er at Chesterville, and 

 Ottawa River near Ottawa. 



