322 



A. G. Huntsman 



ESTUARIAL CIRCULATION OF ZOOPLANKTON 



The typical circulation of water in a river estuary is movement oceanward of the 

 fresher and lighter surface water, and movement riverward of the Salter and heavier 

 deeper water. This is dependent upon tidal mixing of the fresh river water with the 

 salt sea water. It will depend upon the depth from the surface to which particular 



\Ot60ECVASH Bt^fi 



UR DE UWTRE 



i ZL 



Fig. 1. Passamaquoddy Bay, New Brunswick, showing principal rivers, passages to Bay of Fundy 



and positions of the stations mentioned. 



