salmon (models I and II), by Daniel W. Bates 

 and John G. Vanderwalker, pp. 1-5, 6 figs., 1 

 table; 2d paper, Design and operation of a canti- 

 levered traveling fish screen (model V) , by Dan- 

 iel W. Bates, Ernest W. Murphey, and Earl F. 

 Prentice, 10 figs., 1 table. 



609. Annotated bibliography of zooplankton sampling 

 devices. By Jack W. Jossi. July 1970, iii + 

 90 pp. 



610. Limnological study of lower Columbia River, 

 1967-68. By Shirley M. Clark and George R. 

 Snyder. July 1970, iii + 14 pp., 15 figs., 11 tables. 



611. Laboratory tests of an electrical barrier for con- 

 trolling predation by northern squawfish. By 

 Galen H. Maxfield, Robert H. Lander, and 

 Charles D. Volz. July 1970, iii + 8 pp., 4 figs., 



5 tables. 



612. The Trade Wind Zone Oceanography Pilot Study. 

 Part VIII: Sea-level meteorological properties 

 and heat exchange processes, July 1963 to June 

 1965. By Gunter R. Seckel. June 1970, iv + 

 129 pp., 6 figs., 8 tables. 



613. Sea-bottom photographs and macrobenthos col- 

 lections from the Continental Shelf off Massa- 

 chusetts. By Roland L. Wigley and Roger B. 

 Theroux. August 1970, iii + 12 pp., 8 figs., 2 

 tables. 



614. A sled-mounted suction sampler for benthic or- 

 ganisms. By Donald M. Allen and J. Harold 

 Hudson. August 1970, iii + 5 pp., 5 figs., 1 table. 



615. Distribution of fishing effort and catches of skip- 

 jack tuna, Katsuwonus pelamis, in Hawaiian 

 waters, by quarters of the year, 1948-65. By 

 Richard N. Uchida. June 1970, iv + 37 pp., 



6 figs., 22 tables. 



616. Effect of quality of the spawning bed on growth 

 and development of pink salmon embryos and 

 alevins. By Ralph A. Wells and William J. Mc- 

 Neil. August 1970, iii + 6 pp., 4 tables. 



617. Fur seal investigations, 1968. By NMFS, Ma- 

 rine Mammal Biological Laboratory. December 

 1970, iii + 69 pp., 68 tables. 



618. Spawning areas and abundance of steelhead 

 trout and coho, sockeye, and chum salmon in 

 the Columbia River Basin - past and present. By 

 Leonard A. Fulton. December 1970, iii + 37 pp., 

 6 figs., 11 maps, 9 tables. 



619. Macrozooplankton and small nekton in the 

 coastal waters off Vancouver Island (Canada) 

 and Washington, spring and fall of 1963. By 



Donald S. Day, January 1971, iii + 94 pp., 19 

 figs., 13 tables. 



620. The Trade Wind Zone Oceanography Pilot Study. 

 Part IX : The sea-level wind field and wind stress 

 values, July 1963 to June 1965. By Gunter R. 

 Seckel. June 1970, iii + 66 pp., 5 figs. 



621. Predation by sculpins on fall chinook salmon, 

 Oncorhynchus tshawytscha, fry of hatchery or- 

 igin. By Benjamin G. Patten. February 1971, 

 iii + 14 pp., 6 figs., 9 tables. 



622. Number and lengths, by season, of fishes caught 

 with an otter trawl near Woods Hole, Massa- 

 chusetts, September 1961 to December 196 2 . 

 By F. E. Lux and F. E. Nichy. February 1971, 

 iii + 15 pp., 3 figs., 19 tables. 



623. Apparent abundance, distribution, and migra- 

 tions of albacore, Thimnus alalunga, on the North 

 Pacific longline grounds. By Brian J. Rothschild 

 and Marian Y. Y. Yong. September 1970, v + 

 37 pp., 19 figs., 5 tables. 



624. Influence of mechanical processing on the quality 

 and yield of bay scallop meats. By N. B. Webb 

 and F. B. Thomas. April 1971, iii + 11 pp., 9 

 figs., 3 tables. 



625. Distribution of salmon and related oceanographic 

 features in the North Pacific Ocean, spring 1968. 

 By Robert R. French, Richard G. Bakkala, Ma- 

 sanao Osako, and Jun Ito. March 1971, iii + 

 22 pp., 19 figs., 3 tables. 



626. Commercial fishery and biology of the fresh- 

 water shrimp, Macrobrachium, in the Lower St. 

 Paul River, Liberia, 1952-53. By George C. Mil- 

 ler. February 1971, iii + 13 pp., 8 figs., 7 tables. 



629. Analysis of the operations of seven Hawaiian 

 skipjack tuna fishing vessels, June-August 1967. 

 By Richard N. Uchida and Ray F. Sumida. 

 March 1971, v + 25 pp., 14 figs., 21 tables. For 

 sale by the Superintendent of Documents, U.S. 

 Government Printing Office, Washington, D.C. 

 20402 - 35 cents. 



633. Blueing of processed crab meat. II. Identifica- 

 tion of some factors involved in the blue discol- 

 oration of canned crab meat (Callinectes sapi- 

 dus). By Melvin E. Waters. May 1971, iii + 

 7 pp., 1 fig., 3 tables. 



636. Oil pollution on Wake Island from the tanker 

 R. C. Stoner. By Reginald M. Gooding. May 

 1971, iii + 12 pp., 8 figs., 2 tables. For sale by 

 the Superintendent of Documents, U.S. Govern- 

 ment Printing Office, Washington, D.C. 20402 - 

 Price 25 cents. 



