A total of 12,499 pups were tagged and check- 

 marked and 12,077 were marked. Two tags were 

 attached to 2,978 males older than pups on St. Paul 

 Island. Recoveries of seals marked in previous years 

 included 4,418 marked as pups and 159 marked at 

 age 1 or older on the Pribilof Islands, and 30 seals 

 marked as pups on the Soviet Islands. 



Pups tagged in late September apparently survive 

 the effects of tagging better than pups tagged in 

 mid-August. On the basis of tag recoveries, the 

 estimated number of pups born decreased steadily 

 from 643,000 in 1960 to 440,000 in 1964. The esti- 

 mate of pups born in 1966 from marked-to-unmarked 

 ratios was 380,000. Estimates from marked-to-un- 

 marked ratios were similar to total counts of pups 

 on three rookeries. 



An estimated 78,000 males from each of two 

 year classes (1961 and 1962) survived to age 1. 



The forecasted kill of 3- and 4-year old male 

 seals on St. Paul Island in 1966 was 40,000; the 

 actual kill was 37,669. The forcasted kill of males 

 on the Pribilof Islands in 1967 includes 4,000 of 

 ages 2 and 5, 34,300 of age 3, and 17,900 of age 4. 



The 249 adult males killed for study and the 157 

 adult males found dead had similar age distributions. 

 The annual replacement rate for males age 10 and 

 older is estimated aas 0.38. 



Si.\ty-six genital tracts from adult females 

 were collected from 13 September to 28 November. 

 The first of 17 tracts with implantation chambers 

 was collected 4 November; all 5 tracts taken on 28 

 November had implantation chambers. 



In a test to determine accuracy in assigning the 

 correct ages to fur seals from canine teeth, the lowest 

 errors were 2.5 to 3.9 percent for males in ages 



2 to 5 and 3.8 to 21.3 percent for females in ages 



3 to 7. Japanese and U.S. readers disagreed on 

 18.2 percent of males in ages 1 to 4 and 36.5 per- 

 cent of females in ages 1 to 7 in two other groups 

 of teeth. 



Succinylcholine apparently is unsafe for use in 

 immobilizing adult male fur seals. 



Seal pups gained more weight when fed calcium 

 caseinate and fish flour than when fed fish flour 

 alone. Colostrum milk obtained immediately post 

 partum has much higher levels of albumin and 

 globulin than does milk of later lactation. 



Pelagic research was conducted off central and 

 southern California from 21 January to 25 March 

 1966. Seal distribution was studied along transects 

 extending 19 to 222 km. offshore between lat. 32° N. 

 and 38° N. at 37-km. intervals. Seals were usually 

 found 37 to 130 km. offshore. The largest concen- 

 trations of seals were usually near areas where 

 abrupt changes in depths occur along the Continental 

 Shelf and over seavalleys and seamounts. 



Of 2,704 seals sighted, 444 were collected, 78 were 

 wounded and lost, and 67 sank after they were killed. 

 Males formed only a small part of the population. 

 Of 428 females taken, 52 percent were gravid; the 

 youngest gravid female was a primiparous 4-year- 

 old. 



A lanternfish (Myctophum calif ornierise) , a 

 .sciaenid (species unknown), and a squid {Chiroteii- 

 this i-eraiiyi) were found in fur seal stomachs for 

 the first time. Northern anchovy (Engraulis mor- 

 dax) , Pacific saury (Cololahis saira) , Pacific hake 

 (Merluccius productus) , and squids were the prin- 

 cipal food species of fur seals off California. 



585. Length-weight relation and conversion of 

 "whole" and "headles-s" weights of royal-red 

 shrimp, Hymenopenaeus rohustiis (Smith) , by 

 Edward F. Klima. May 1969, iii + 5 pp., 3 

 tables. 



ABSTRACT 



Differences in the length-weight regression co- 

 efficient (b) between sexes are noted for shrimp in 

 one of three areas, and differences among areas are 

 apparent. 



Equations for converting whole weight to headless 

 weight and vice versa are given for three areas. 

 The estimating equations differ between the areas. 

 Estimating equations for each area are adequate 

 for describing the relation between whole and head- 

 less weights and headless and whole weights. 



586. Published in 1970. 



587. Transplanting adult pink salmon to Sashin 

 Creek, Baranof Island, Alaska, and survival 

 of their progeny, by William .J. McNeil, Steph- 

 en C. Smedley, and Robert J. Ellis. August 

 1969, iii -f 9 pp., 3 figs., 6 tables. 



ABSTRACT 



The return of adult pink salmon, Oveorhyvchus 

 gorbuscha, to Sashin Creek was very low in the 

 even years from 1946 to 1962. In 1964 an exper- 

 iment tested a method of transplanting adults to re- 

 establish the even-year run of pink salmon. 



About 2,400 adult pink salmon were captured in 

 a purse seine in Bear Harbor and transported alive 

 in brine tanks on a boat to Sashin Creek, a distance 

 of about 80 km. (50 miles). Most of the fish sur- 

 vived the trip; 727 males and 1,139 females were 

 put into Sashin Creek above a weir. The trans- 

 planted fish were augmented by 166 females and 

 121 males of unknown origin that entered the stream 

 naturally. 



The distribution of the spawners in the stream 

 was similar to that of native runs of the same size. 

 Survival of the eggs and progeny from a potential 

 deposition of 2,230,000 eggs was relatively good for 

 Sashin Creek — 55 percent to the end of spawning 

 and 14 percent to fry emergence the next spring. 

 The survival of these fish in the ocean was also rel- 

 atively good, and about 6,000 adults (2 percent 

 of the fry) returned to spawn in 1966. These fish 

 spawned successfully, and survival of fry in 1967 

 from the potential egg deposition was 12 percent. 



13 



