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Division of Research 



hatched in 1944. This age group, which has provided very attractive fishing in the 

 last two years, is now almost exhausted. 



The disposal of fish waste arising from the netting operations is also being 

 studied. Further experiments in handling sucker fillets were carried on last year, and 

 a trial shipment of one ton was sent to a cold storage firm which undertook to test 

 their acceptability in the retail market. Some cooked fillet waste was sold as mink food. 



Scientific investigations of the fish populations in South Bay are under the 

 direct supervision of Dr. Fry. Early investigations included biological and hydrological 

 surveys and the development of routine procedures for studying the catches. Informa- 

 tion has been collected on the food, growth and egg production of the more important 

 species. Changes in the size and age composition of fish caught are being followed in 

 order to determine the exact effects of the heavy fishing. 



Tagging studies have yielded information on a number of important questions. 

 Over 5000 fish were tagged in 1950, almost half of which were whitefish. Recoveries 

 of these fish, and some tagged in previous years, showed extensive migrations of 

 whitefish, following two main routes. The larger group leaves South Bay and enters 

 the northern part of Georgian Bay through the Owen Channel at the south-east 

 corner of Manitoulin Island. The other group moves south across the mouth of 

 Georgian Bay to the west shore of the Bruce Peninsula. 



Testing of Toxicity of industrial 'ii'aste. 



