Similarly common in Bering Sea is Hexagrammos, which along the Asiatic 

 coast does reach Anadyr Gulf and is only seen rarely; on the American coast 

 reach farther north to Port Clarence and Bering Straits (Bean h^ indicated 

 the occurence of Hexagrammos stelleri Tilesius from St. Michael and Port Clarence). 



19. Icelus spiniger mtermedlus Lindberg and Andriashev 



Icelus spiniger Jordan & Gilbert (non Gilbert) Fish Bering Sea, 1899, 



p. 453 (East Kamchatka, 96-100 fath). 

 Icelus spimger intermedius Lindberg & Andriashev . Review of the geographical 



forms of the sculpm Ic_. spimger of the N. Pacific. 1935 M. S. 



As was shown recently, this common species may be divided into three 

 subspecies: (Lindberg & Andriashev, 1935) 



1 . Icelus spiniger spiniger Gilbert - Eastern Bering Sea & Aleutian Ids . 



2 . Icelus spiniger intermedius Lindberg & Andriashev - Western Bering 

 Sea & Okhotsk Sea . 



3. Icelus spiniger cataphractus (Pa velenko) -Northern Japan Sea & Aniva Bay. 



In Bering Sea the subspecies intermedius was discovered by us (DALNEVOSTOTCHNIK 

 1932) in Avacha Bay and off Cape Olytorsky and SE of Cape Navarin at depths of 

 115-142 meters on sandy clay bottoms at positive temperatures (usually a little 

 above 0"). This subspecies occupies an intermediate position between the typical 

 form of the East Bering Sea Icelus spatula (SIC) and the subspecies cataphractus 

 from the Japan Sea, which forms it replaces ecologically at greater depths . From 

 the former species it differs, as can be judged from Gilbert's description and 

 figure, by the notched pectoral fin and well developed postorbital spines, spine - 

 like elevations on the crest of the suborbital stay, and ia the presence of 

 numerous small prides on the top and sides of the head. From the Japanese 

 subspecies it varies in the simple or serrated (but not saddlelike) shape of 

 the shields (spines) of the lateral line, the lesser depth of the pectoral notch, 

 in an obsolescent preorbital spine, etc. 



Below are the measurements of the examples 136-181 mm TL (Bering Sea off 

 Cape Olytorsky) m percentage of SL. Head 30.4-31.3, depth of head 17.4-18.2, 

 head width 18.8-18.9, longest ray, upper pectoral lobe 22.6-23.2, longest ray, 

 lower pectoral lobe (7th ray) 26. 1-26.3, shortest (lowest) ray of upper pectoral 

 lobe 21.6-22.6 (in examples from Okhotsk Sea 19.8-20.9, in Icelus spiniger 

 cataphractus from Japan Sea 17.7-20.9). In percentage of head length: Occipital 

 spine length 8.8-9.0 (in examples from Okhotsk Sea 10.7-11.3), orbit 33.0-34.4. 

 The height of the caudal peduncle m percentage of its length 23. 1-25.0. Fin 

 formula: 



DIX, 21-23 A 16-18 LI 42-45 First row spines 28-32 



15 



