Text 

 In conclusion let us note that the problem of dynamics of from 



numbers of Gyrodactylus still demands considerable work for its success- p. 137 

 ful solution. Without it, it is not possible to utilize fruitfully the data about 

 life cycles for the purpose of preventing parasitic infections. 



2500 



eooo 



I5O0 



1000 



500 



2 4 6 



8 10 12 14 16 18 SD 22 24 Se 2S SO 

 24 -HOUR PERIODS 



Fig. 134. Accretion curves represent numbers of the progeny of indi- 

 vidual Dactyloqyrus and Gyrodactylus . 1 - Gyrodactylus ; 

 2 - Dae tylogyrus . 



144 



