PROGRESS IN BIOLOGICAL INQUIRIES, 1929 



By Elmer Higgins 



Chief, Division of Scientific Inquiry 

 (With the colhihoration of investigators) 



CONTENTS 



Page 



Introduction 1070 



North and Middle Atlantic fishery investigations 1073 



Oceanographic studies 1073 



Cod, haddock, and pollock 1074 



Mackerel 1076 



New England smelt 1078 



Shore fishery of the Middle Atlantic States 1079 



Independent activities at the Fisheries Biological Laboratory, Woods Hole, 



Mass '_ 1081 



MacMillan Labrador and Baffin Land expedition 1081 



South Atlantic and Gulf fishery investigations 1082 



Shore fishes of North Carolina 1082 



Terrapin culture 1082 



Bay scallop . 1083 



Activities of the Fisheries Biological Laborator}^, Beaufort, N. C 1083 



Gulf coast studies 1085 



Great Lakes fishery investigations _• 1085 



^ Commercial fisheries 1085 



m Limnological studies ._ 1087 



Cooperative survey of Lake Erie 1087 



Studies in Wisconsin lakes 1089 



Growth of fishes 1089 



Limnological studies 1090 



Pacific coast and Alaska fishery investigations 1090 



^ Alaska salmon 1091 



Columbia River salmon 1095 



Alaska herring 1095 



Razor clams 1096 



Conservation of fislx by means of screens and ladders 1096 



Mechanical fish screens 1096 



Electric fish screens 1097 



Effectiveness of screens 1098 



Fish ladders 1101 



Investigations in trout culture 1102 



Feeding experiments 1103 



Breeding experiments 1104 



Diseases of trout 1106 



Investigations in pond fish culture 1106 



Investigations in the Upper Mississippi Wild Life and Fish Refuge 1108 



Control of aquatic vegetation 1109 



Oyster investigations 1111 



Experimental studies in oyster culture 1111 



Physiology of adult and larval oysters 1115 



Surveys of oyster bottoms 1117 



Control of enemies 1119 



Fresh-water mussel investigations 1119 



' Appendix XV to the Report of the U. S. Commissioner of Fisheries for 1930. B , F. Doc. 1096. 



10G9 



