- 61 DON 



175 OOV 165 OOW 155 00V 1 45 OOV 135 00V 1 25 OOW I I 5 OOV 



Figure 6.— The seven collection areas of northern fur seals, 1958-74. 



stomach content volume generally does not change even 

 though the ranking by volume within this list may change for 

 each area (Table 3). The four principal prey species consumed, 

 based on percentage of total stomach content volume by 

 month for California, Oregon, Washington, British Colum- 

 bia, Gulf of Alaska, western Alaska, and the eastern Bering 

 Sea are shown in Tables 4 to 10. 



The leading four prey species consumed by fur seals during 

 each of the collection years off California (1958-59, 1961, 

 1964-66) contributed 82 to 99% of the total stomach content 

 volume during these years (Fig. 7). Similarly for the Bering 

 Sea, the principal prey species contributed 75 to 99% of the 

 total stomach content volume from collections made in 1960, 

 1962-64, 1968, 1973-74 (Fig. 8). In the other areas the principal 

 forage species contributed 64 to 99% of the total food volume 

 off Washington (Fig. 9); 66 to 95% off British Columbia (Fig. 

 10); 89 to 99% in the Gulf of Alaska (Fig. 1 1); and 77 to 99% 

 off western Alaska (Fig. 12). 



Six prey species formed the major food of fur seals off Cali- 

 fornia during the collection period and, as shown in the fol- 



Table 1. — Fishes eaten by fur seals in the eastern North Pacific Ocean and eastern Bering Sea, 1958-74, by area. 











Location 

















Location 

















a 















(0 















e 



X> 



E 



3 



«3 



CO 











e 



Si 



£ 



3 



cd 



3 







'5 



J5 



B 

 O 

 00 



- 



IE 



O 



O 



< 



o 



< 



c 



CO 



u 



00 



n 





2 

 *E 



o 



c 

 o 



o 



oo 



c 

 IE 



O 



U 



J3 



< 



o 



< 



c 

 u 



V 



r/i 



00 



c 



Food items 



crj 



U 



6 





CQ 



3 



O 





u 



CQ 



Food items 



13 



U 



u 



6 



e3 



CQ 



3 



o 





CQ 



Entosphenus tridentatus 



X 



Squalls acanthias 



X 



Hydrolagus colliei 



- 



Clupeidae 



X 



A tosa sapidissima 



X 



Clupea harengus pallasi 



X 



Engraulis mordax 



X 



Salmomdae 



- 



Oncorhynchus spp. 



X 



O. gorbuscha 



- 



O. keta 



- 



O. kisutch 



- 



O. nerka 



- 



O. tshawylscha 



- 



Salmo gairdneri 



- 



Osmeridae 



- 



Hypotnesus pretiosus 



X 



Mallotus viltosus 



- 



Thaleichthys paciflcus 



X 



Bathylagidae 



- 



Tactostoma macropus 



X 



Scopelosaurus sp. 



- 



Paralepis ailanuca 



X 



Myctophidae 



X 



Tarletonbeania crenularis 



X 



Symbolophorus califomiensis 



X 



Lampanyctus sp. 



- 



Anotopterus pharao 



- 



Cololabis saira 



X 



Gadidae 



- 



Gadus macrocephalus 



- 



Merluccius productus 



X 



Microgradus proximus 



- 



Theragra chalcogramma 



- 



Casterosleus aculealus 



- 



Trachipteridae 



Trachipterus altivelis 



Trachurus symmetricus 



Sciaenidae 



Brama japonica 



Medialuna califomiensis 



Scomber japonicus 



Sebastes spp. 



S. at ut us 



S. entomelas 



S. jordani 



Anoplopoma fimbria 



Hexagrammidae 



Pleurogrammus monopterygius 



Cottidae 



Cyclopteridae 



Aptocyclus ventricosus 



Trichodontidae 



Trichodon trichodon 



Ammodytes hexapterus 



B at hym aster idae 



Bathymaster signatus 



Anarhichadidae 



Anarhichas orientalis 



Zoarcidae 



Tetragonurus cuvieri 



Atherinopsis califomiensis 



Pleuronectiformes 



Citharichthys sp. 



Pleuronectidae 



A theresthes stomias 



Hippoglossus stenolepis 



Lyopsetta exilis 



Reinhardtius hippoglossoides 



Porichthys notatus 



Unidentified 



