THE SEA OTTER IN THE EASTERN PACIFIC OCEAN 117 



Table 13. — Frequency of occurrence of food species in 309 sea otter stomachs 

 from Amchitka Island, Alaska — Continued 



Number of stomachs having item — 



Of 107 Of 20 Of 182 

 stomachs stomachs stomachs 

 February- October March- 

 Food organism April 1962 1962 April 1963 Total Percent 



Melius ca: 



Amphineura: 



Lined chiton Tonicella 



cf . T. marmorea 



Mossy chiton Mopalia sp. . 

 Giant chiton Cryptochiton 



atellerL- 



Chiton unidentified— 



Gastropoda : 



Limpet Acmaea sp. 



Snail : 



Thais sp 



Natica clausa 



Buccinum sp 



Argobuccinum 



oregonensis 



Gastropod unidentified 



Pelecypoda: 



Cockle Clinocardium 



cUiatum 



Clam: 



Liocyma viridia 



Serripes 



Macona sp. 



Unidentified 



Mussel : 



Musculus vernicosa 



Volsella volsella.. 



Pearly monia Pododesmus 



macroschisma 



Cephalopoda: Octopus sp 



Mollusk unidentified - 



TotaL 



Echinodermata : 

 Asteroidea : 



Blood star Henricia 

 Six-rayed star 



Starfish Ceramaster sp 



Brittle star Ophiuroidea.- 

 Echinoidea: Green sea urchin 

 S trongylocentrotus 



drobachiensis 



Holothuroidea : Sea cucumber 

 Cucumaria sp 



Total 



Chorda ta: 



Tunicata: Tunicate (2 



species ) 



Vertebra ta : 



Osteichthyes : 



Sablefish Anoplopoma 



fimbria 



Rock greenling Hexa- 



grammos supercUiosus 



Atka mackerel Pleuro- 



grammus monopterygius- 

 Red Irish lord HemUepi- 



dotus hemUepidotus 



Globefish Cyclopterichthys 



glaber 



Cottidae unidentified 



Fish and fish eggs 



unidentified 



Total- 



Grand total __. 



1 









1 





1 



— 







1 





4 



5 





8 

 2 



17 

 2 





5 



5 





10 



20 





1 



— 





4 



5 





1 









1 





10 







7 



17 





6 







00 eo 



J 



14 



3 





2 



— 





1 



3 





1 



— 









1 





1 









1 



3 





— 



— 





3 

 2 



2 





10 



12 





24 



46 





22 



6 





21 



49 





28 



2 





20 



50 





12 



4 





14 



30 











3 



3 





105 



34 





130 



269 



31 



15 



2 





11 



28 





29 







28 



57 





6 



- 





6 



12 





1 



— 





13 



14 





71 



17 





92 



180 





17 



4 





5 



26 





139 



23 





155 



317 



37 



4 



1 





6 



11 



1 



1 









1 





5 



1 





9 



15 





4 



2 





3 



9 





18 



4 





14 



36 





22 







87 



109 





1 









1 





5 









5 





56 



7 





113 



176 



22 











848 



100 



