The 3-year difference between the appear- 

 ance of a new year class of pups and the 

 estimate of its size, in addition to inflationary 

 errors in the estimate, tends to make it 

 difficult to understand the current situation. 



An accurate estimate of the number of 

 pups now being produced is an essential 

 starting point for adjustments in manage- 

 ment measures. The adjustments would lead 

 to a closer approach to the point of maximum 

 sustained yield and to efficient use of surplus 

 females. 



To obtain more accurate and more current 

 estimates of production, experiments are be- 

 ing carried on (1) to use a mark ratio to es- 

 timate the number of pups during their first 

 year and (2) to determine sources of bias in 

 estimates from tags and to measure their 

 effect. 



The life history of the hookworm infecting 

 fur seals as brought out by recent research 

 illustrates again the futility of more than ex- 

 perimental management without some under- 

 standing of the biology of the species being 

 managed. The investigation of hookworm in- 

 fection is a beginning in a study that should 

 identify the causes of fur seal mortality, their 

 relative importance, how they operate, their 

 interrelationships, and how they are influenced 

 by population size. 



When a start has been made in assembling 

 this kind of knowledge, forecasts of year- 

 class success can be based on more definite 

 relationships than those that now must be used. 



The 1962 field season on the Pribilof Islands 

 extended from May to November. Arrivals, 

 departures, and affiliations of research work- 

 ers were as follows: 



Name 



William J. L. Sladen 



Richard S. Peterson 



Arrival and Departure 

 23 April to 4 June 



15 May to November 



Affiliation 



Johns Hopkins 

 University 



Bureau of Com- 

 mercial Fisheries 

 and Johns Hopkins 

 University 



Work 



Upper respiratory 

 infections in humans 



Behavior of fur seals 



Eugene T. Lyons 



David Hopkins 



Allen Cox 

 Edward Roth 



20 May to 10 September Colorado State 



University 



18 June to 20 July 



U.S. Geological 

 Survey 



Hookworm 

 infection of fur seals 



Geology of Pribilof 

 Islands 



Peter A. Dzikiewicz ' 



Robert L. DeLong''" 

 Robert L. Rost ^ 



20 June to 10 September Bureau of Com- 

 mercial Fisheries 



Fur seal research, 

 general 



C. John Ralph 



27 June to September 



See footnote at end of listing. 



