No. Title 



541. Distribution and occurrence of Gymnodinium breve on the west coast 

 of Florida, 1964-65. By Alexander Dragovich and John A. Kelly , 

 Jr. December 1966, iii + 15 pp., 4 figs. , 4 tables. 



542. Some effects of DDT on the ecology of salmon streams in South- 

 eastern Alaska. By Roger J. Reed. November 1966, iii + 15 pp., 

 1 fig. , 9 tables. 



543. Inventory of U.S. exploratory longline fishing effort and catch 

 rates for tunas and swordfish in the Northwestern Atlantic, 

 1957-65. By Peter C. Wilson and Martin R. Bartlett. February 

 1967, v + 52 pp. , 81 figs. , 13 tables. 



544. Abundance and distribution of zooplankton in Hawaiian waters, 

 1955-56. By Eugene L. Nakamura. May 1967, vi + 37 pp. , 18 

 figs. , 32 tables. 



545. Evaluation of a pump and reeled hose system for studying the 

 vertical distribution of small plankton. By Roderick Leong. 

 January 1967, iii + 9 pp., 6 figs. , 2 tables. 



546. Longline fishing for deep- swimming tunas in the Marquesas Islands 

 and adjacent areas. By Howard O. Yoshida. April 1967, iii + 



10 pp. , 10 figs. , 3 tables. 



547. Response of migrating adult salmonids to vertical and horizontal 

 rectangular orifices at two depths. By Clark S. Thompson, William 

 Spencer Davis, and Emil Slatick. June 1967, iii + 8 pp. , 7 figs. , 



5 tables. 



548. Expendable bathythermograph data on subsurface thermal structure 

 in the eastern North Pacific Ocean. By J. F. T. Saur and 

 Dorothy D. Stewart. August 1967, iii + 70 pp. , 9 figs. , 13 tables, 

 50 graphs. 



549. Atlas of July oceanographic conditions in the northeast Pacific Ocean, 

 1961-64. By R. W. Owen, Jr. January 1967, vi + 85 pp., 82 figs. 



550. Biology and management of the American shad and status of the 

 fisheries, Atlantic Coast of the United States, I960. By Charles H. 

 Walburg and Paul R. Nichols. August 1967, vi + 105 pp. , 33 figs. , 

 55 tables. 



551. Preliminary report on the feeding habits of tunas in the Gulf of 

 Guinea. By Paul N. Sund and William J. Richards. July 1967, 

 iii + 6 pp. , 1 fig. , 2 tables. 



552. The trade wind zone oceanography pilot study. Part I: Toumsend 

 Cromwell cruises 1, 2, and 3, February to April 1964. By Robert L. 

 Charnell, David W. K. Au, and Gunter R. Seckel. June 1967, 



v + 75 pp. , 28 figs. , 3 tables. 



49 



