PROGRESS IN BIOLOGICAL INQUIRIES, 1932^ 



By Elmer Higgins, Chief, Division of Scientific Inquiry 

 [With the collaboration of investigators] 



CONTENTS 



Page 



Introduction 80 



Publications 82 



North and Middle Atlantic fishery investigations 84 



Haddock 85 



Mackerel 8S 



Cod 91 



Flounders 92 



Shore fishes of the Middle Atlantic States 92 



Chesapeake Bay investigations 9& 



Experimental rearing of marine fish larvae 97 



South Atlantic and Gulf fishery investigations 97 



Investigations of spawning habits, embryology, larval development, 



and rate of growth of fishes 97 



Ichthyological studies 98 



Shrimp investigations 98 



Pacific coast and Alaska fishery investigations 103 



Puget Sound sockeye-salmon investigation 103 



Karluk red-salmon investigation 104 



Chignik red-salmon investigation 106 



Copper River red-salmon investigation 107 



Pink-salmon investigation 108 



Statistics of the Alaska salmon fisheries 109 



H erring investigations 109 



Alaska razor-clam survey ._ 110 



Conserving fish life by use of screens and ladders 111 



Mechanical fish screens 111 



Electric fish screens 111 



Fish ladders 113 



Fish protection on Government projects 114 



Great Lakes fishery investigations 115 



Chub fisheries of Lake Michigan and Green Bay 117 



Deep trap nets of Lakes Huron and Michigan 118 



Studies in Lake Erie 119 



Cooperative investigations, interior lakes of Wisconsin 120 



Oyster investigations 122 



Investigations in North Atlantic States 122 



South Atlantic oyster studies 123 



Pacific coast oyster studies 125 



Investigations in aquiculture 127 



Pond-fish culture 128 



Trout culture.- 131 



California trout investigations 134 



Fish diseases 135 



Cooperative studies of the nutritional requirements of trout 136 



Limnological investigations in the Rocky Mountain region in the interest 



of fish stocking 138 



Surveys in the national parks and national forests 138 



Other limnological studies 140 



> Appendix II to the Report of the U.S. Commissioner of Fisheries for 1933. Approved for publication 

 Apr. 11, 1933. 



79 



