THE SEA OF OKHOTSK 



815 



Table 321. Mean number of specimens and mean biomass of bottom-living fauna of 

 Shelekhov Bay (TV. Vinogradova, 1954) 



Group 



No. of specimens per 1 m 2 



Biomass, g/m 2 



Polychaeta 



Mollusca 



Crustacea 



Echinodermata 



Sipunculoidea 



Others 



324 

 127 

 516 



77 



3 



57 



28-3 

 210-3 

 940 

 55-8 

 660 

 15-1 



Total 



1,304 



469-5 



The northern part of the Bay and the Gizigina Inlet are occupied by a 

 biocoenosis in which Leda pernula{?), Ophiura sarsi, Amphiodia craterodmeta, 

 and Ophiura maculata are predominant. Among the Mollusca there 

 is an abundance of Leda minuta, Yoldia myalls, Y. llmatula, Y. traclaeformis, 

 Macoma calcarea, Saxicava arctlca and Cardium ciliatum. Among the Poly- 

 chaeta the most numerous are Maldane sarsi ; among the Crustacea Malda- 

 nidae, Myriochele occulata, Chaetozone setosa, Scoloplos armlger and Mage- 

 lone pacifica are distinguished by their numbers. 



The benthos biomass increases considerably (Fig. 409 and Table 321) at 

 the entrance to the Inlet (500, 1,000 g/m 3 and more) and in Gizigina Inlet 

 (up to 1,000 g/m 2 ) ; moreover, Mollusca and Echinodermata are predominant 

 in the north of the Bay. 



Fig. 409. Distribution of benthos biomass in 



Penzhina Guba, Sea of Okhotsk, g/m 2 . 



(Vinogradova). 



