Charles Edward Walker AMATEUR FISH CULTURE - indir bedava kayıt olmadan

AMATEUR FISH CULTURE

Çevre

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 Salmonid? Fish culture, particularly trout culture, has become a trade, and a paying one. To any one who has the least idea of the difficulties to be overcome in rearing Salmonid? this fact alone proves that fish culture must have progressed to a very advanced stage as a science.

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Nobel Akademik Yayıncılık; 1. baskı 3 Ocak 2017 Springer 1 Ocak 2015 Cambridge University Press 1 Ocak 2017 Independently Published 1 Haziran 2018 1 Ocak 2018 Nobel Akademik Yayıncılık; Facsimile. baskı John Hornsby 1 Ocak 2016 Marvin Bittinger Kolektif Springer Cambridge University Press BrownTrout Publisher John Wiley & Sons Inc

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