No. Title 



564. Description and evaluation of methods for determining incident solar 

 radiation, submarine daylight, chlorophyll I, and primary produc- 

 tion, used by Scripps Tuna Oceanography Research Program in the 

 eastern tropical Pacific. By Robert W. Holmes. December 1968, 

 iii + 31 pp. , 5 figs. , 15 tables. 



565. Passage conditions and counts of fish at the Snake Island fishway, 

 Little Falls Dam, Potomas River, Md. , 1960-63. By Paul R. 

 Nichols. February 1968, iii + 14 pp. , 7 figs. , 5 tables. 



566. Horizontal and vertical distribution of juvenile salmonids in Upper 

 Mayfield Reservoir, Washington. By Jim Ross Smith, John R. 

 Pugh, and Gerald E. Monan. April 1968, iii + 1 1 pp. , 6 figs. , 



6 tables. 



567. Setting and first season survival of the American oyster, Crassostrea 

 yirginica, near Oxford, Maryland, 1961-62. By J. R. Webster and 

 W. N. Shaw. July 1968, iii + 6 pp. , 2 figs. , 4 tables. 



568. The Japanese Atlantic longline fishery, 1964, and the status of the 

 yellowfin tuna stocks. By John P. Wise. August 1968, i + 5 pp. , 

 1 fig. , 5 tables. 



569. Oyster mortalities, with particular reference to Chesapeake Bay and 

 the Atlantic coast of North America. By Carl J. Sindermann. July 

 1968, iii + 10 pp. , 7 figs. 



570. Fishes taken during shrimp trawling along the South Atlantic Coast 



of the United States, 1931-35. By William W. Anderson. July 1968, 

 iv + 60 pp. , 9 figs. , 13 tables. 



5 71. Spawning areas and abundance of chinook salmon (Oncorhynchus 



tshawytscha) in the Columbia River basin--past and present. By 

 Leonard A. Fulton. October 1968, iii + 26 pp. , 5 figs. , 8 tables. 



572. Effects of lamprey larvicides on invertebrates in streams. By 

 Richard L. Torblaa. August 1968, iii + 13 pp., 2 figs., 11 tables. 



573. Physical, chemical, and biological oceanography of the entrance to 

 the Gulf of California, spring of I960. By Raymond C. Griffiths. 

 December 1968, iii + 47 pp. , 40 figs. 1 table. 



5 74. Some operational aspects of the Hawaiian live-bait fishery for skip- 

 jack tuna (Katsuwonus pelamis). By Vernon E. Brock and Richard N. 

 Uchida. September 1968, iii + 9 pp. , 1 fig. , 5 tables. 



575. Length relations of some marine fishes from coastal Georgia. By 

 Sherrell C. Jorgenson and Grant L. Miller. November 1968, iii + 

 16 pp. , 3 tables. 



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