growth of introduced fry in Ruth Lake. Other fact- 

 ors that might influence sockeye production, such as 

 plankton and bottom fauna, were also considered. 



In general, growth and survival of fry and bi- 

 ological productivity were greater in the treated 

 lake. Growth and survival decreased as fry den- 

 sities increased. 



533. Annual fish passage report — Rock Island 

 Dam Columbia River, Washington, 1965. By- 

 Paul D. Zimmer and John H. Broughton. Oc- 

 tober 1966, iii + 24 pp., 3 figs., 21 tables. 



.ABSTRACT 



Fish were again counted through the fishways 

 at Rock Island Dam, thus providing counts at this 

 location of the 33d consecutive year. Chinook and 

 sockeye counts were down, and coho and steelhead 

 counts were up from 1964. The counts of chinook, 

 coho, and steelhead were larger, and the count of 

 sockeye smaller than their respective averages for 

 1933-64. The count of salmon and steelhead was ex- 

 ceeded by the count of other species. 



Four and one-half percent of the salmon and steel- 

 head passing through the counting gates had in- 

 juries. 



Daily maximum and minimum water tempera- 

 tures and daily average rate of stream flow were 

 recorded. 



534. Distribution and abundance of sardine and 

 anchovy larvae in the California current re- 

 gion oflF California and Baja California. 1951- 

 64: A summary. By Elbert H. Ahlstrom. 

 August 1966, iii -i- 71 pn., 6 figs., 66 tables. 



ABSTRACT 



Data summarized in this report document the 

 nine-fold increase in the anchovy population (based 

 on numbers of larvae) between 19.51 and 1964, as 

 well as the marked decline in the distribution and 

 abundance of sardine larvae. Data for the years 

 1958-64 are treated in more detail than those for 

 earlier years. Information was obtained on coop- 

 erative hydrographic-biological cruises of the Cal- 

 ifornia Cooperative Oceanic Fisheries Investiga- 

 tions. 



535. Red-tide research summarized to 1964 in- 

 cluding an annotated bibliography. By George 

 A. Rounsefell and Walter R. Nelson. Decem- 

 ber 1966, iii + 85 pp., 8 figs., 4 tables, 1 app 

 table. 



ABSTRACT 

 This paper summarizes from published and un- 

 published (lata and reports the status of research 

 on the Florida red tide up to 1964. It contains 292 

 references, mostly annotated, on red tide and closely 

 related subjects. The relation of oceanographic con- 

 ditions to red-tide blooms, the seasonal and coast- 

 wise distribution of the Florida red tide, and prog- 



ress in various aspects of research are discussed. 



536. Fur seal investigations, Pribilof Islands, 

 Alaska, 1965. By Alton Y. Roppel, Ancel M. 

 Johnson, RajTnond E. Anas, and Douglas G. 

 Chapman, v + 45 pp., 14 figs., 21 tab'es, 23 

 app tables. 



ABSTRACT 

 The age classification of 40,367 male fur seals 

 (Callorhinns ursimi.i) killed on the Pribilof Islands 

 in 1965 was: age 2, 4 percent; age 3, 56 percent; 

 age 4, 36 percent; and age 5, 4 percent. The ages 

 of 901 male seals were not determined. The peak 

 of the kill occurred 27-31 July. Predicted kills of 

 3- and 4-year-old males on St. Paul Island were 

 33,000 and 16,000; actual kills to 9 August were 

 19,009 and 12,046. All 2-year-old males available 

 22-26 July on St. Paul Island were killed to deter- 

 mine if abundance on land at age 2 is related to 

 return of the year class at age 3. To test the com- 

 mercial value of their skins, 854 males larger and 

 older in appearance than those normally taken were 

 killed. Harem and idle bulls counted on the Prib- 

 ilof I.slands were 10.470 and 6,729. Of 10,432 fe- 

 males killed, St. Paul Island contributed 7,530, and 

 St. George Island, 2,902. Selective killing for young 

 females on St. Paul Island 23-27 .August produced 

 88 percent in ages 2-5; nonselective killing on St. 

 George Island 16-27 August produced 64 percent 

 in ages 2-5. Sixty-five 3-ypar-old females examined 

 were nulliparous; 1 of 51 4-year-old females was 

 primiparous and recently post partum. Recoveries of 

 marked seals included 4,947 with tags or checkmarks 

 applied in the year of birth, 238 selected and tagged 

 as yearlings in previous years, and 36 seals tagged 

 by the U.S.S.R. Ten thousand pups were single- 

 tagged and checkmarked, and 20,087 were check- 

 marked onlv; 922 seals were double-tagged as year- 

 lings. Pup mortality on land was 46,308. On the 

 basis of tag recoveries from males and counts of 

 dead pups, about 560,000 pups were born on the 

 Pribilof Islands in 1961 and 500.000 in 1962. On 

 the basis of tag recoveries from females, 344,107 

 pups were born in 1960, 527.482 in 1961, and 337,012 

 in 1962. Marked-to-unmarked ratios yielded an esti- 

 mate of 347,000 pups born on the Pribilof Islands 

 in 1965. From tags recovered in 1965 from seals 

 tagged as yearlings in previous years, we estimated 

 that there were 78.000 yearling males in 1961 and 

 85,000 in 1962. The average weight of untagged 

 and unmarked seal pups exceeded that of tagged 

 and marked seal pups by 1.14 kg. (males) and 

 1.04 kg. (females). The predicted kill of male seals 

 on St. Paul Island in 1966 includes 3,000 of ages 

 2 and 5, 26.000 of age 3, and 14.000 of age 4. Fe- 

 male seals will not be purpo.sely killed in 1966. 



537. Published in 1967. 



538. Distribution of spawning pink salmon in 

 Sashin Creek, southeastern Alaska, and sur- 



