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BULLETIN OF THE BUREAU OF FISHERIES 
where fresh and salt water meet, is due to the lighter fresh water flowing over the 
heavier salt water. (See Pettersson, 1894, and Murray and Hjort, 1912.) The sharp 
increase occurs usually at about 10 meters, but there are exceptions, and at times, 
depending upon the flow of fresh water from the rivers, the character of the tides, the 
winds, the temperature, etc., the line of demarcation may be nearer the surface or 
BULL NECK J I K SHANK’S ISLAND 
below 10 meters. While the stratification just described was very marked during 
most of our cruises, there were times in the spring and winter months when the water 
approached a condition of equal salinity from surface to bottom. (Fig. 10.) A 
discussion of this phenomenon will be taken up under seasonal distribution of salinity. 
Figure 10.— Salinity profile from Horse Shoe Point to Bloody Point, January 27, 1921 
In addition, the vertical distribution of salinity as seen in profiles illustrates 
graphically the conclusions arrived at above from a study of the data for surface and 
bottom salinities; namely, that the more saline surface water, in general, lies nearer 
the eastern shore, although in the northern part of the bay it may be found on either 
side with almost equal frequency, and that the more saline bottom water follows the 
deep-water channel Y, X, S, R, L, J, Q, A, and G. 
