PROGRESS IN BIOLOGICAL INQUIRIES, 1930 



By Elmer Higgins, Chief, Division of Scientific Inquiry 

 (With the collaboration of investigators) 



CONTENTS 



Introduction 554 



North and Middle Atlantic Fishery investigations 559 



Oceanographic studies 560 



Cod 563 



Haddock 565 



Flounders 566 



Mackerel 567 



New England smelt 569 



Trout and chars 569 



Atlantic and landlocked salmon 569 



Shore fishery of Middle Atlantic States 570 



Chesapeake Bay investigations ■ 574 



Independent activities at the Fisheries Biological Laboratory, Woods 



Hole, Mass 574 



South Atlantic and Gulf fishery investigations 575 



Shore fishes of North Carolina 575 



Terrapin culture 576 



Bay scallop 576 



Pollution of streams in western North Carolina 577 



Shrimp 578 



Activities of the Fisheries Biological Laboratory, Beaufort, N. C 580 



Ichthyological studies 580 



Great Lakes fisbr ->' investigations 581 



Lake Char . m 581 



Lake Micij;gan and Green Bay 582 



Lake Erie 583 



Lake Huron _ 583 



Wisconsin inland la^vc investigations 583 



Limnological stu ies 584 



Pacific coast and Alaska fishery investigations 586 



Alaska salmon 586 



Columbia River salmon 591 



Alaska herring 591 



Razor clams of Alaska 592 



The cockle 593 



Rouge River steelhead tagging 593 



Conserving fish life by means of screens anrl ladders 594 



Mechanical screens 594 



Electric screens 595 



Fish ladders 601 



New and proposed projects 602 



Investigations in the interest of fish culture 603 



Pond-fish culture 603 



Limnological investigations 605 



Upper Mississippi Wild Life and Fish Refuge 605 



Trout culture 608 



Fish diseases 611 



Mppondix III to the Report of the TJ. S. Commissioner of Fisheries for 1931. Approvofl 

 for publication, July 30, 1931. 



553 



