TABLE OF CONTEXTS. 



rage. 



A. lutrodiictory remarks - 1 



1. Outline of operatious for 1S71 and 1S72 1 



2. Assistance aftbrded 2 



B. General consideration of the lake-fisheries » 3 



3. Investment in the fisheries 3 



4. Extent of the lake-fisheries '. 5 



5. Statistics for the year 1S72 6 



C. Character of fishing in difierent localities 7 



6. Lake Superior 7 



7. Lake Michigan 7 



8. Lake Huron 11 



9. Saint Clair and Detroit Rivers 12 



10. Lake Erie .' 13 



11. Lake Ontario 13 



12. Boats 13 



D. The decrease of the food-fishes 14 



13. The evidences of the decrease , 15 



14. When the decrease began 16 



15. The amount of decrease 16 



16. The causes of the decrea.se 16 



a. The pound-nets 17 



h. The gill-nets 18 



c. Throwing ofi:'al on the fishing-grounds 19 



d. Pollution of lake-bottoms with sawdust 19 



E. Practicable methotls for increase 19 



17. Protective legislation 20 



18. Ai-tificial propagation , 24 



a. History of white-fish culture 25 



&. History of sahnou-trout cultm-e 34 



F. Economical and natural history of food-fishes of the lakes. . . - 35 



13. Distributions of species according to depths 35 



a. Vertebrate fauna 35 



h. Invertebrate fauna 36 



20. The salmon or Maciukaw trout, Salmo namaycusli 38 



21. The siscowet, Salmo siscmvct 42 



22. The white-fish, Coregonus aJbus 43 



a. General considerations , 43 



b. Food of the white-fish 44 



c. Migrations of the white-fish 46 



d. Habits during the breeding-season 48 



e. Habits of brook-trout during the breeding season, compared 52 



/. Development of eggs and embryo 55 



(f. Food of embryonic white-fish 57 



h. Rate of growth of white-fish 58 



i. Average size of mature fish 60 



j. Range of young white-fishes as to depth 61 



