42 FISH-CULTURAL vASSOCIA TION, 
would not lead us to expect the individual eggs of the smaller 
fish to be of a larger size. This is, however, the actual fact, the 
difference being quite noticeable, and amounting to say twenty 
per cent. in weight. Among the migratory salmon of the Pe- 
nobscot, ovarian disease is very.rare; but with the land-locked 
salmon of the Schoodic lakes it is very common. In 1883, by 
careful observation we learned that 18 per cent. of the female 
fish were affected with some disease of the ovaries, resulting in 
defects of the eggs which were apparent to the eye,—in some 
instances involving the entire litter, but in general a very small 
number of eggs. This phenomenon was observed before artifi- 
cial breeding began at Grand lake stream, and does not appear 
to be influenced thereby. 
The habits of the two forms of salmon afford the strongest 
contrasts. The anadromous salmon has its home in the sea, and 
there, exclusively, are its feeding grounds; it visits the fresh 
water only for the purpose of breeding, and during its stay there 
abstains from food and constangly falls away in flesh. Its young 
on attaining the age of one or two years and a weight of two or 
three ounces, descends to the sea to complete its growth. The 
land-locked salmon never visits the sea except accidentally, and 
makes its home in the fresh water lakes. It has its feeding 
grounds in the lakes and rivers, and instead of fasting six months 
or a year at a time, curbs its ravenous appetite for but a few 
weeks at the spawning season. 
My observations on the date of spawning lead to the conclu- 
sion that it is a week later with the land-locked than with, the 
anadromous salmon. In approaching the spawning ground, the 
land-locked salmon move either up into an affluent stream or 
down into an effluent stream, being governed, so far as I can see, 
by the peculiar circumstances of each case. There are not want- 
ing some indications that they prefer an effluent, but I think that 
the phenomena admits of a different explanation. The young fry 
in most instances move up the stream to gain the lake which is 
to be their future home, but in some instances quite the reverse. 
It does not appear that in any of these phenomena we have un- 
covered any essential difference in habits and instincts, but when 
the sea salmon attains the age for the seaward migration, an in- 
