774 



BULLETIN OF THE BUEBATJ OP FISHERIES 



Vachon's (1918) and Mavor's (1923) determinations show that the vertical dis- 

 tribution of salinity within the Bay of Fundy varies regionally in summer, probably 



FiQ. 139.— Vertical distribution of salinity in the deep bowl ofE Gloucester in July and August of 

 diflerent years. G. July 10, 1912 (station 10002); A, August 9, 1913 (station 10089); X, August 

 22, 1914 (station 10253); O, August 31, 1916 (startiou 10306). The broljen curves mark the 

 approximate limits of annual yariation 



depending on local and temporal variations in the strength of the tidal streams. 

 Where the water is least stirred vertically, and where the surface is least saline 

 because most subject to the freshening effect of the outflow from the St. John River, 

 the salinity of the upper 40 to 50 meters very closely parallels that of the mouth of 

 Massachusetts Bay (fig. 139) and of the western side of the guK generally, grading 

 from this to the vertical uniformity characteristic of the Grand Manan Channel. 



Strong tidal currents are similarly responsible for a close approach to vertical 

 homogeneity over German Bank in August as in spring (p. 748) and early summer 

 (p. 756), the greatest difference between the surface and the bottom at any of our 

 summer stations there being only about 0.3 per mille, as follows: 



