764 



BIOLOGY OF THE SEAS OF THE U.S.S.R 



L. Kizevetter (1954) has recorded interesting observations on the chemical 

 composition and food value of the Sea of Japan plankton. He has found that 

 these indices, both of the zooplankton as a whole and of its separate com- 

 ponents, may be subject to considerable seasonal variations, their food value 

 being altered as a result {Tables 307, 308 and 309). 



Table 307. Mean chemical composition of winter (January and February) zooplankton 



in the Sea of Japan 



Table 308. Mean chemical composition of spring (April and May) zooplankton in the 

 northwestern part of the Pacific Ocean 



Table 309. Mean chemical composition of autumn (August) zooplankton in the Sea of 



Okhotsk 



Thus the calorific value of 100 g of zooplankton varies from 331-6 to 501-9. 

 The chemical composition of the phytoplankton of the Sea of Okhotsk in 

 August with its lower fat content and higher content of carbohydrates is 

 markedly different from that of the zooplankton. 



