408 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Some Conclusions. 



It is obvious that in correlating fish movements with 

 plankton we must take into account both the volume and 

 the composition or nutritive value of the latter; further 

 work is required on this point. It is desirable that some 

 general agreement as to methods of estimating volumes, 

 and also of determining nutritive values, should be 

 arrived at without delay, so that comparable data may 

 be provided for the approximate estimation of fish food 

 at different localities and seasons. 



The methods of enumeration hitherto in use need 

 not, however, be dropped. They may eventually prove 

 to give results of value, and for the sake of continuity 

 of observation it would be unfortunate if any gaps in the 

 series of records were left. 



In connection with the zonal distribution of plankton 

 and the vertical oscillations, it is necessary to make 

 horizontal hauls at various depths so as to determine the 

 plankton contents of the different strata of water. 



In addition to the minimum of observations required 

 from our seas under the International organisation, it is 

 most desirable that the observations carried out on our 

 different coasts should be standardised under a national 

 scheme of plankton research. 



