Fishery Bulletins 



FB 40. The whitefish fishery of lakes Huron 

 and Michigan with special reference to the 

 deep trap-net fishery, by John Van Oosten, 

 Ralph Hile and Frank W. Jobes. 1946. 

 297-394 p. , illus. From Fishery Bulletin 

 of the Fish and Wildlife Service, v. 50. 



FB 41. Studies of the protozoan parasites of 

 fresh-water fishes, by H. S. Davis. 1947. 

 1-29 p. , illus. From Fishery Bulletin of 

 the Fish and Wildlife Service, v. 51. 



FB 42. Effect of different concentrations of 

 micro-organisms on the feeding of 

 oysters; (O. virginica), by V. L. Loosa- 

 noff and James B. Engle. 1947. 31-57 p. , 

 illus. From Fishery Bulletin of the Fish 

 and Wildlife Service, v. 51. 



*FB 43. Ecological and physiological studies 



of the effect of sulfate pulp mill wastes on 

 oysters in the York River, Virginia, by 

 Pauls. Galtsoff, Walter A. Chipman, 

 Jr. , James B. Engle and Howard N. 

 Calderwood. 1947. 59-186 p. , illus. From 

 Fishery Bulletin of the Fish and Wildlife 

 Service, v. 51. 



FB 44. Contributions to the biology of the 



Pacific tunas, by Milner B. Schaefer and 

 JohnC. Marr. 1948. 187-206 p. , illus. 

 From Fishery Bulletin of the Fish and 

 Wildlife Service, v. 51. 



FB 45. Age and growth of immature rosefish 

 (Sebastes marinus) in the Gulf of Maine 

 and off western Nova Scotia, by Alfred 

 Perlmutter and George M. Clarke. 1949. 

 207-228 p. , illus. From Fishery Bulletin 

 of the Fish and Wildlife Service, v. 51. 



FB 46. Notes on the Philippine frigate 

 mackerels, family Thunnidae, genus 

 Auxis, by Charles B. Wade. Illustrations 

 by Pablo Bravo. 1949. 229-240 p. , 

 illus. , From Fishery Bulletin of the Fish 

 and Wildlife service, v. 51. 



FB 47. Definitions of body dimensions used 

 in describing tunas, by John C. Marr and 

 Milner B. Schaefer. 1949. 241-244 p. , 

 illus. From Fishery Bulletin of the Fish 

 and Wildlife Service, v. 51. 



FB 48. Observations on juvenile oceanic 

 skipjack (Katsuwonus pelamis) from 

 Hawaiian waters and Sierra mackerel 

 ( Scomberomorus sierra) from the eastern 

 Pacific, by Howard H. Eckles. 1949. 

 245-250)?, illus. From Fishery Bulletin 

 of the Fish and Wildlife Service, v. 51. 



FB 49. Biology of the Atlantic mackerel 

 (Scomber scombrus) of North America. 

 Part 2 - Migrations and habits, by Oscar 

 Elton Sette. 1950. 251-358 p., illus. From 

 Fishery Bulletin of the Fish and Wildlife 

 Service, v. 51. 



FB 50, On the effectiveness of spermatozoa 

 of the pink salmon (Oncorhynchus 

 gorbuscha) at varying distances from 

 point of dispersal, by Richard F. Shuman. 

 1950. 359-363 p., illus. From Fishery 

 Bulletin of the Fish and Wildlife Service, 

 V. 51. 



FB 51. Fluctuations in abundance of Columbia 

 River chinook salmon (Oncorhynchus 

 tschawytscha), 1935-45, by Ralph P. 

 Silliman. 1950. 365-383 p. , illus. From 

 Fishery Bulletin of the Fish and Wildlife 

 Service, v. 51. 



FB 52. Apparent abundance of the pilchard 



(Sardinops caerulea) off Oregon and Wash- 

 ington, 1935-43, as measured by the 

 catch per boat, by John C. Marr. 1950. 

 385-394 p. , illus. From Fishery 

 Bulletin of the Fish and Wildlife Service, 

 V. 51. 



FB 53. Juvenile forms of Neothunnus 



macropterus, Katsuwonus pelamis and 

 Euthynnus yaito from Philippine seas, b_, 

 Charles B. Wade. Illustrations by Pablo 

 Bravo. 1950. 395-404 p. , illus. From 

 Fishery Bulletin of the Fish and Wildlife 

 Service, v. 51. 



FB 54. Description of a projection device for 

 use in age determination from fish scales, 

 by Kenneth H. Mosher. 1950. 405-407 p. , 

 illus. From Fishery Bulletin of the Fish 

 and Wildlife Service, v. 51. 



FB 55, Observations on the spawning of 

 Philippine tuna, by Charles B. Wade. 

 1950. 409-423 p., illus. From Fishery 

 Bulletin of the Fish and Wildlife Service, 

 V.51. 



43 



