CONTENTS 



PAGE 



Introduction 5 



Authorization of survey 5 



Area covered 5 



Development of a stocking policy 5 



Allotments of fish 6 



Pollutional conditions in the Genesee river system 7 



Fish population 8 



Colored plates of minnows 8 



Silver lake and Conesus lake 9 



New lakes 9 



Personnel 11 



Presentation of data 11 



Section I. Stocking policy for the Genesee river system 12 



The problem 12 



Water temperature 12 



Cold springs 14 



Stream bed 14 



Shade : 14 



Oxygen and carbon dioxide 15 



Purity 16 



Size of water 17 



Character of bottom in relation to natural spawning 17 



Barriers to fish movements 18 



Waters of the Genesee system worthy of stocking 18 



Brook trout waters 18 



Brown trout waters 19 



Rainbow trout waters 19 



Small-mouthed bass waters 20 



Large-mouthed bass, sunfish and catfish waters 21 



Pike-perch waters 21 



Two new lakes 21 



Streams not to be stocked 23 



Number of fish to bs planted 23 



Area of stream available for trout 24 



Abundance of primary food organisms. ... 24 



Pool conditions 24 



Enemies, effects of angling 25 



Productivity of a unit area 25 



System of numbering streams 26 



Abbreviations and symbols used 28 



Section II. Chemical investigation of the Genesee river system 29 



Types of pollution 29 



Gaseous relations 29 



Methods employed 30 



Conditions encountered 30 



Importance of character of stream 32 



Summary 35 



Section III. Biological studies of polluted areas 38 



Milk pollution 38 



Domestic sewage 40 



Cannery and vinery wastes 40 



Oil pollution 41 



Salt pollution 43 



Paper mill wastes 44 



Miscellaneous wastes 44 



Summary 44 



Tabulation of pollution studies 45 



