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One of its managers courteously showed me over
it. It is not necessary minutely to describe its arrangements, from
the spawning ponds and the hatching tanks--the latter contained in a
huge building, whose temperature is preserved with the utmost care at
the rate found best suited to the ova--to the multitude of streams,
ponds, and lakes in which the different kinds of fish are kept during
the several stages of their existence. The task of the breeders is
much facilitated by the fact that the seas of Mars are not, like ours,
salt; and though sea and river fish are almost as distinct as on
Earth, each kind having its own habitat, whose conditions are
carefully reproduced in the breeding or feeding reservoirs, the same
kind of water suits all alike. It is necessary, however, to keep the
fishes of tropical seas and streams in water of a very different
temperature from that suited to others brought from arctic or
sub-arctic climates; and this, like every other point affecting the
natural peculiarities and habits of the fish, is attended to with
minute and accurate care.


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