GENERAL CHARACTERISTICS OF THE EASTERN SEAS 



703 



considerable admixture of cold water forms is observed only in the very 

 northern part of these Seas. Its distribution is limited in the Sea of Japan by 

 the warm waters of the Tsushima current, which brings warm-water plankton. 

 Bathypelagic Calanoida (400 to 3,000 m) are more widely distributed ; how- 

 ever, they disappear completely from the fauna of the Sea of Japan (except 



Oligobrachia dooieli 

 BirsTelma viTjasi 



Sibog 



Stboq 



S.bog 

 Sibog 



ilteryi 



num cincTuTum 



num peMucidum 

 num minuTum 

 nam pus.Uum 



Siboglmum fedofovi - © 



Siboglinum plumosum - «. 



НерГаЬгасК'Э. abysiicota '- D 



HepTabrachia gracilis - и 



HepTabrachia subtilis - о 



HeptabracWa bennqensis- в 



Mybrachia annuUta в 



Ро[ц.ЬгэсЫа barbafa 



(ongiss 

 Larnetlisabella zachsl 

 Lamellisabella johan»! 

 Sp'robrachia grandis 

 5pirobra;hid ber.lemist 

 Diplobrachia japonic 



Fig. 337. Distribution of Pogonophora in northwestern 

 part of the Pacific Ocean (Ivanov, 1959). 



for certain upper bathypelagic forms) which are retained in the shallow 

 straits. 



Two hundred and twenty-four species of Calanoida have been established 

 for the northern part of the Pacific Ocean, including 39 for the Sea of Japan, 

 71 for the Sea of Okhotsk and 49 for the Bering Sea. 



Among the Calanoida of the Far Eastern Seas certain species are of excep- 

 tional significance for fish and cetaceans. Off the eastern coasts of Kamchatka 

 Eucalanus bungei and Calanus cristatus form the main food of the herring. In 

 the Sea of Japan the pilchard feeds mostly on Paracalanus parvus, Pseudo- 

 calanus elongatus and Calanus pacificus. The whales Balaenoptera physalis, 

 B. borealis, B. musculus and Megaptera nodosa feed on Copepoda, mainly 

 Calanus cristatus. 



As has been mentioned above, the sub- Arctic waters of the Kuril current 

 (Oyashio) meet the warm waters of Kuroshio off Honshu Island in 40° to 



