No. Title 



* 50. Kishinouye's order Plecostei. Translated from the Japanese lan- 



guage by W. G. Van Campen. January 1951, i + 16 pp. 



* 51. Japanese skipjack studies. Translated from the Japanese language 



by W. G. Van Campen. January 1951, i + 30 pp. , 12 figs. , 

 1 table. 



* 52. On the Japanese black tuna (Thunnus orientalis). Translated from the 



Japanese language by W. G. Van Campen. January 1951, 

 i + 22 pp. , 8 figs. , 3 tables, 1 chart. 



* 53. Seasonal variations in toxicity of butter clams from selected Alaska 



beaches. By John S. Chambers and Harris W. Magnusson. 

 August 1950, i + 10 pp. , 9 figs. , 2 tables. 



* 54. Mid- Pacific oceanography, January through March, 1950. By 



Townsend Cromwell. July 1951, iv + 9 pp. , 18 figs. 



* 55. Natural history of the sea lamprey, Petromyzon marinus, in Michigan. 



By Vernon C. Applegate. December 1950, xii + 237 pp. , 65 figs. , 

 49 tables. 



* 56. Sacramento - San Joaquin Delta fishery resources: effects of Tracy 



Pumping Plant and Delta Cross Channel. By Leo F. Erkkila, 

 James W. Moffett, Oliver B. Cope, Bernard R. Smith, and Reed S. 

 Nielson. December 1950, iii + 109 pp. , 12 figs. , 27 tables. 



* 57. Survey of the Columbia River and its tributaries- -Part VIII. By 



Zell E. Parkhurst. December 1950, ii + 19 pp. , 2 figs. 



* 58. A fishery survey of southern coastal waters. By Raymond J. 



Buller. February 1951, ii + 21 pp. , 4 figs. , 1 table. 



* 59. Tests of hatchery foods for blueback salmon (Oncorhynchus nerka), 



1944-1948. By Roger E. Burrows, Leslie A. Robinson, and David D. 

 Palmer. March 1951, iii + 39 pp. , 3 figs. , 5 tables. 



* 60. Tests of hatchery foods for blueback salmon, 1949. By Leslie A. 



Robinson, David D. Palmer, and Roger E. Burrows. April 1951, 

 i + 21 pp. , 6 tables. 



* 61. Sea lamprey spawning runs in the Great Lakes in 1950. By 



Vernon C. Applegate and Bernard R. Smith. April 1950, iv + 

 49 pp., 17 figs. , 10 tables. 



* 62. A study of the causes of death of bait fishes. By Yasuo Suehiro. 



Translated from the Japanese language by W. G. Van Campen. 

 March 1951, ii + 57 pp. , 12 figs. , 24 tables, 1 plate. 



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