TABLE OF CONTENTS. 



Page 



A. lutroductory remarks 1 



1. Outline of operatious for l-^' 1 and 1872 1 



2. Assistance afforded 2 



B. General consideration of the lake-tisheries 3 



o. Investment in the fisheries 3 



4. Extent of the lake-fisheries 5 



5. Statistics for the year 1872 6 



C. Character of fishing in different 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 



i). The decrease of the food-fishes 14 



13. The evidences of the decrease 15 



14. When the decrease began IG 



15. The amount of decrease 16 



13. The causes of the decrease , 16 



a. The pound-nets 17 



h. The gill-nets 18 



c. Throwing oftal on the fishing-grounds 19 



d. Pollution of lake-bottoms with sawdaist 19 



E. Practicable methods for increase 19 



17. Protective legislation 20 



18. Artificial propagation 24 



rt. History- of white-fish culture 25 



h. History of salmon-trout cultiu-e 34 



y. Economical and natiu'al history of food-fishes of the lakes 35 



19. Distributions of species according to depths 35 



fl. Vertebrate fauna 35 



1). Invertebrate f auua 36 



20. The salmon or Macinkaw trout, Sa hno namcojcush 38 



21. The siscowet, Sahno siscowef 42 



22. The white-fish, Corc<jonHS aJhus 43 



rt. General considerations 43 



b. Food of the white-fish 44 



c. Migrations of the white-fish 48 



d. Habits during the breeding-season 48 



f. Habits of brook-trout during the breeding season, compare<l 52 



/. Development of eggs and embryo 55 



(j. Food of embryonic white-fish 57 



7i. Rate of growth of white-fish 58 



r. Average size of mature fish 60 



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



