38 



MARINE FISHERIES OF NORTH CAROLINA 



PAMLICO SOUND 



SURFACE DISTRIBUTION OF SALINITY cZ% 

 JULY 1927 



Fig. i6. Surface distribution of salinity in Pamlico Sound, July, 1927, represented by the 

 isohalines. Added and encircled are the average surface salinities as given by Winslow (1886) for 

 the year 1886. The isohalines were drawn by H. R. Seiwell and are published here through the 

 courtesy of the U. S. Fish & Wildlife Service. 



Density records, convertible to salinity, are available for the Diamond 

 Shoal Lightship station for the period April, 1923, through April, 1928 (U. S. 

 Coast and Geodetic Survey, 1945) . It is doubtful that the hydrometer method 

 used for such measurements is sufficiently accurate to evaluate slight salinity 

 changes that would be significant in these oceanic waters. The mean for this 

 series, namely 35%o is, however, unquestionably representative of the station. 

 Other data for these shelf waters include (i) the salinity tabulations of the 

 Woods Hole Oceanographic Institution,^^ including Bohnecke's (1938) 

 records but not the U. S. C. G. S. records mentioned above, and (2) hydrom- 

 eter readings taken by the U. S. Bureau of Fisheries for the Cape Lookout 



15. Compiled for the Division of Oceanography, Hydrographic Office, U. S. Navy. 



