FISHES. 2¥5 
CHAPTER XXII. 
FISHES — continued. 
362. Some fishes are fitted to live in fresh water, and 
some in salt, while others can live in both equally well. 
Some remain in one place, but others are wandering; and 
some make long periodical journeys or migrations. At 
the time for spawning or laying their eggs, fishes in the 
sea generally either approach the coasts or go up the 
rivers. The Herrings are an example of the former, and 
the Shad and Salmon of the latter. In these migrations 
the Salmon observe regular order, as the wild geese do 
in theirs. They form two long files, united together in 
front, and led by the largest female in the troop. The 
males form the rear guard. When any obstacle opposes, 
they leap over it, sometimes to the height of ten or even 
sixteen feet. In this way they ascend rivers nearly to 
their sources, and deposit their eggs in the autumn in 
holes which they dig in the sand. Remaining here 
through the winter, in the early spring they return to 
the sea. It seems that the Salmon have the same instinct 
that some birds have in regard to place, § 212. This 
was proved by a naturalist named Deslandes in this way. 
He placed a ring of copper on twelve of these fish, and 
set them at liberty in the River Auzou, in Brittany. 
They, of course, emigrated, but the next year five of them 
were caught in the same place, the second year three, 
and the year after three more. 
363. Most fishes are abundantly prolific. You can see 
this to be so if you observe the roe or spawn of any fish, 
this being the collection of the eggs of the animal. It is 
estimated that at least 60,000 eggs are contained in the 
roe of a Herring. The roe of a Codfish was ascertained 
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