762 



BULLETIN OF THE BUEEAU OF FISHERIES 



Although no considerable shift of this particular isohaline is indicated off Massachu- 

 setts Bay by the data for 1925 (Fish HatoJc cruise 14), the 40-meter level was more 

 nearly uniform in salinity there that June (32.6 to 33.4 per mille) than it had been 

 the month before. 



At greater depths in the gulf (as illustrated by the 100-meter level), which are 

 but slightly affected by the spring freshets from the rivers or by the Nova Scotian cur- 

 rent, the mean saUnity increased by about 0.2 per mille in the eastern side of the 

 basin from May (fig. 127) to June (fig. 134) in 1915, but continued almost constant 

 in the western side. Mavor (1923) has also recorded an increase in the salinity of 

 the deep water of the Bay of Fundy during this same period, from 32.5 per mille 

 at 100 meters on May 4, 1917, to 32.7 per mille on June 15. A change of the 



Fig. 134.— Salinity at a depth of 100 meters, last hair of June, 1915 



same sort was registered in the bottom of the open basin, as illustrated by the 

 following tables: 



Salinilies {per mille) at 175 meters 



Date 



March, 1920 

 April, 1920.. 

 May, 1915.. 

 June, 191.'i.. 



Northeast- 

 ern corner 



Easternside 



33.78 

 34. 02 

 33.40 

 33.60 



34.04 

 34.30 

 33.46 

 33.64 



Southeast- 

 ern part 



34.20 

 34. 56 



34.00 



Eastern 

 Channel 



34.83 

 34.60 



Western 

 basin 



33.82 

 33.84 

 33.37 

 33.66 



Center 



33.08 

 34.18 

 33.45 

 33.50 



