. Frank Forester Pesci e pesca degli Stati Uniti e British Province del Nord America [microformati] illustrato dalla natura dell'autore. La pesca; Pesci; Pêche sportive; Poissons. I salmoni^. 69 allo scopo di mostrare come si potrebbe essere portati a diretto utilità pratica e reso asservito al piacere del pescatore, come un metodo di stoccaggio delle acque interne , e in secondo luogo di sottolineando come esperimenti facilmente potrebbe essere fatta in questo modo, come per la ibridazione di pesci, e l'allevamento di nuove specie di muli o accertare che essi non possono essere allevati, dal commixture

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. Frank Forester's fish and fishing of the United States and British provinces of North America [microform] illustrated from nature by the author. Fishing; Fishes; Pêche sportive; Poissons. SALMONID^. 69 for the purpose of showing how they may be brought into direct practical utility, and rendered subservient to the pleasure of the angler, as a method of stocking inland waters , and, secondly, of pointing out how easily experiments might be made in this mode, as to the hybridization of fishes, and the rearing new species of mules, or ascertaining that they cannot be reared, by the commixture of the milt and roe of various distinct species of the same family in small tanks, fed by running brooklets. It has been shown above, that the impregnated spawn of any two live breeding fishes of the same family, may be artificially hatched and preserved in waters other than those in which the parent species are wont to live ; as even the Salmon in fresh-water. I shall now proceed to show that the same result may be obtained by the commixture of the melt and roe in aerated water, of dead fishes recently taken. It is absolutely necessary that the water should be aerated, or highly ⢠supplied with oxygen. For it is for the purpose of finding water in this condition, that the Salmon, the Shad, the Bass, the Smelt, and all those fish which resort to fresh-waters, for the' purpose of spawning, run to the shallow, pure, and swiftly-flowing brooks, to which their rapidity and frequent falls impart purity and vitality, by mingling them with the atmosphere. In the same manner, the fish of the sea resort for the deposition of their ova to the weedy shoals, where the vegeta- bles, in process of their growth, under the influence of the sun, distri- bute air through the waters around them. " The science required for this object"âthat is to say, the raising foreign fishes for the stocking of home watersâthus speaks Sir Hum- phrey Davy, in his delightful work, " Salmonia

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• bookcentury1800
• bookdecad
• booksubjectfishes
• booksubjectfishing