Fish culture of a certain kind dates from very early times, but its scientific development has only come about quite recently. Most people know that in our own country the monks had stew ponds, where they kept fish, principally carp, and also that the Romans kept fish in ponds. In the latter case we hear more often of the eel than of other fish. The breeding of trout and salmon, and the artificial spawning and hatching of ova, are, however, an innovation of our own time. Much has been discovered about the procreation of fish, and in no case have scientists worked so hard and discovered more than in the case of _Salmonidae_. Fish culture, particularly trout culture, has become a trade, and a…
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