52 FISH-CULTURAL- ASSOCIATION. 
sidered, and attain as large size in lakes of a few hundred acres 
area as in those covering thousands of acres. For instance, the 
largest salmon of the Grand lake region are found in West Mus- 
quash lake, whose area is less than a thousand acres; and among 
new localities we may instance Shrewsbury lake, in Vermont, 
only one mile long and one-half mile wide, where such signal 
success has attended the introduction of these fish. 
The depth of water is apparently a more important matter. I 
think the rule will hold good that large fish of the salmon family 
generally inhabit deep lakes. Of the native haunts of the land- 
locked salmon, the deepest is Lake Sebago, where 410 feet of 
water have been found, and in this region we find the largest 
land-locked salmon in Maine; it must, however, be noted, as a 
possible exception to our rule, that the salmon of Long pond, a 
tributary of Lake Sebago of much smaller size, and, it is suppos- 
ed, much shallower water, are not much, if any, inferior to those 
of Sebago itself, and have actually furnished the largest individ- 
uals on record. West Musquash lake, which produces the larg- 
est salmon of that region, is known to be in some places over 
130 feet deep, while Grand lake is not known to be over 115 feet. 
Shrewsbury lake in Vermont, is 160 feet deep. , 
Iam not, however, prepared to say that there can be no suc- 
cess in lakes of moderate depth. It is known that land-locked 
salmon were once abundant at Princeton, at the outlet of the 
lower lakes of the Schoodic chain. They must have inhabited 
Lewy’s, Long or Big lakes, all of which are in general, shallow, 
and in which there is good reason to believe, though by no means 
_ certain, that a depth of more than sixty feet cannot anywhere be 
found. | 
As to temperature, | am only able to say that the phenomena 
observed indicate that on the approach of hot weather the sal- 
mon forsake the streams.and surface waters, and retire to the 
depths, where it is always comparatively cool. It is likely that 
they will not permanently thrive in waters where they are com- 
pelled to endure through the summer a surface temperature, or 
say upwards of 70 degrees Fahrenheit. Very likely this limit 
will have to be moved a few degrees up or down, when data are 
obtained. The latitude in which nature has placed these fish, 
