PROGRESS IN BIOLOGICAL INQUIRIES, 1930 575 



During the summer months the bureau's activities in plankton 

 ^:tudies, observations of spawning of fishes, hirval development and 

 growth of juvenile fishes in the vicinity of Woods Hole were centered 

 at the laboratory. This work is seriously handicapped through lack 

 of a boat capable of operating an otter trawl of sufficient size to catch 

 fishes for experimental work. Provision of new floating equipment 

 at the laboratory is a matter of utmost urgency if research work is 

 to continue. 



In accordance with the bureau's long-established policy of en- 

 couraging independent research in marine biology and related sub- 

 jects, the facilities of the laboratories at Woods Hole, Mass., were 

 made available to a number of investigators from various educational 

 institutions. Personnel so accommodated at Woods Hole included : 

 Dr. Robert Payne Bigelow, Massachusetts Institute of Technology, 

 stomatopoda of the AJhatios eastern Pacific expedition; Leon C. 

 Chesley, Duke University, enzymes of fishes; Dr. N. A. Cobb, De- 

 partment of Agriculture, nematodes ; Paul S. Conger, U. S. National 

 Museum, diatom investigations; William L. Doyle, Johns Hopkins 

 University, pituitary of Mivstelis catiis and Lophius piscatorius ; 

 Kendal W. Foster, Harvard University, the blue phase in coloration 

 of Fundulus ; Dr. I. E. Gray, Duke University, respiration of fishes ; 

 Dr. F. G. Hall, Duke University, respiration studies on marine 

 fishes; Dr. John C. Hennneter, Johns Hopkins University, Langer- 

 hans organ of Lophius; Dr. Edwin Linton, University of Pennsyl- 

 vania, trematodes of fishes; Raymond W. Root, Duke University, 

 respiratory function of the blood of marine fishes ; Wellford Taylor, 

 Princeton University, Crepidula eggs and pituitary of rats and cats; 

 Gerald Thorne, Department of Agriculture, nematodes; Sam R. 

 Tipton, Duke University, respiration of fishes; Leonard G. Worley, 

 Harvard University, cilia of marine and fresh-water animals. 



SOUTH ATLANTIC AND GULF FISHERY INVESTIGATIONS 

 SHORE FISHES OF NORTH CAROLINA 



The investigation relative to the development of fish eggs and 

 young fish undertaken several years ago was continued throughout 

 the year by Dr. Samuel F. Hildebrand, assisted by Louella E. Cable. 

 A special effort was made to secure missing larval stages of several 

 species and to collect sufficient samples for determining the rate of 

 growth of several commercial species by making large series of 

 length measurements at frequent intervals. Pronounced progress 

 was made in both lines of endeavor. 



The study of the large collection of young fish that has been accu- 

 mulated from collections made locally and secured from elsewhere 

 was pursued energetically. A report on the subject was completed 

 during the year. Preparation of drawings and descrii)tions on the 

 development of other species was continued and fairly complete data 

 for several forms, not included in the recently published paper, are 

 at hand. 



Miss Cable has undertaken, also, a critical study of the life history 

 of the pigfish {Orthopr^istis chrysoptei'us) . For the determination 

 of the growth, age, and span of life she is making use of otoliths and 

 scale characters in addition to length measurements. 



75544—31 4 



