No. Title 



* 419. Annual fish passage report - Rock Island Dam, Columbia River, 



Washington, I960. By Paul D. Zimmer and Clifton C. Davidson. 

 April 1962, iv + 21 pp. , 3 figs. , 20 tables. 



* 420. Physical, chemical, and biological observations in the eastern 



tropical Pacific Ocean: Three cruises to the Gulf of Tehuantepec, 

 1958-59. By Maurice Blackburn, Raymond C. Griffiths, Robert W. 

 Holmes, and William H. Thomas. July 1962, iii + 170 pp. , 

 3 figs. , 6 tables. 



* 421. Annual fish passage report - Rock Island Dam, Columbia River, 



Washington, 1961. By Paul D. Zimmer and John H. Broughton. 

 April 1962, iii + 24 pp., 3 figs., 21 tables. 



* 422. Records and observations from plankton grid studies off Baja 



California, April 1952. By David Kramer. September 1963, 

 iii + 42 pp. , 7 figs. , 16 tables. 



* 423. The composition, abundance, and depth distribution of the 1957 



summer net zooplankton of Bare Lake, Alaska, after fertilization. 

 By Robert F. Raleigh. 1963, iii + 14 pp. , 6 figs. , 3 tables. 



* 424. Photographic census of the Steller sea lion herds in Alaska, 



1956-58. By Ole A. Mathisen and Ron J. Lopp. 1963, iii + 

 20 pp. , 7 figs. , 12 tables. 



* 425. Chum salmon resources of Alaska from Bristol Bay to Point Hope. 



By Chester R. Mattson. May 1962, iii + 22 pp. , 5 figs. , 8 tables. 



* 426. An electrical oxygen- temperature meter for fishery biologists. 



By Kermit E. Sneed and Harry K. Dupree. June 1962, ii + 13 pp. , 

 9 figs. , 2 tables. 



* 427. Whirling disease of trouts caused by Myxosoma cerebralis in the United 



States. By Glenn L. Hoffman, Clarence E. Dunbar, and Arthur 

 Bradford. June 1962, iii + 15 pp., 14 figs. 



* 428. An evaluation of fyke trapping as a means of indexing salmon 



escapements in turbid streams. By Howard D. Tait, Jerry L. 

 Hout, and Fredrik V. Thor steinson. June 1962, iii + 18 pp., 

 14 figs. , 4 tables. 



* 429. Estimating abundance of pink and chum salmon fry in Prince 



William Sound, 1957. By Howard D. Tait and James B. Kirkwood. 

 June 1962, iii + 21 pp. , 9 figs. , 6 tables. 



* 430. The length, age, and sex ratio of chum salmon in the Alaska 



Peninsula, Kodiak Island, and Prince William Sound areas of 

 Alaska. By Fredrik V. Thor steinson, Wallace H. Noerenberg, 

 and Howard D. Smith. 1963, iv + 84 pp., 7 figs. , 11 tables. 



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