490 



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



Copepoda and Rotifera play a dominant part in the Sea of Azov zooplank- 

 ton. Their annual mean biomass, according to A. Okul's data, is 210 mg/m 3 , 

 i.e. more than 50 per cent of the total zooplankton biomass, with fluctuations 



Fig. 232b. Alterations of zooplankton biomass in the Gulf of Taganrog (Pitzik and 



Novoshilova). 



from 10 to 600 mg/m 3 . Copepoda reach their greatest development in July 

 and August. Their main forms are Acartia clausia, A. latisetosa, Centropages 

 kroyeri and Calanipeda aquae dulcis (Figs. 233 and 234). The first and last 

 forms are found all the year round, the second and third reach their greatest 

 development during the warmest part of the year. In the Gulf of Taganrog 



