. Bollettino della Società Zoologica . e ricevuto al i.quarium May6th e sono stati tutti covati entro il 17 maggio. Questi pesci senza dubbio si sarebbero fatti crescere più velocemente nello spazio offerto da un laghetto di pesci-hatcheryrearing, ma la loro dimensione attuale e la loro condition è eccellente, considerando i limitazionidi un carro armato di esposizione e il fatto che theyhad non ha avuti dell'insetto vario e del cibo altrive da trovare negli stagni. Essi havelittle della bellezza del greyling preso fromloro flussi nativi freddi, ma è comunque interessante che siamo stati in grado di portarli in frigorifero Croton acqua una dieta NO

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. Zoological Society bulletin . e received at the i.quarium May6th and were all hatched by May 17th. These fishes would doubtless have grownfaster in the space afforded by a fish-hatcheryrearing pond, but their present size and con-dition is excellent, considering the limitationsof an exhibition tank and the fact that theyhave had none of the varied insect and otherlive food to be found in ponds. They havelittle of the beauty of grayling taken fromtheir cold native streams, but it is neverthelessinteresting that we have been able to hatchand rear them in refrigerated Croton wateron a diet no more varied than minced beefheart and liver. The grayling is essentially a fish of thecold and clear streams of the North and doesnot naturally inhabit United States watersexcept in Montana and Northern Michigan.Its range in our waters is being extendedsomewhat by introduction. The grayling is the equal of the trout infood and game qualities. The writer hascaught specimens a foot long, above the ZOOLOGICAL SOCIETY BULLETIN 1057. MUSKALLUNGE (Lucius Masquinongy) Arctic Circle in Alaska, and they grow stilllarger. With salmon, pike, yellow spottedtrout and whitefish fresh from the icy KowakRiver, our explorers turned to the graylingas the finest of all the fishes brought intocamp. ^Ye used to see them in good sizedschools in the Arctic streams and they hadnone of the wildness of trout, but lingeredin the shallow water in full sight of theanglers. The Government hatchery at Bozeman hasbeen in operation since 1891, and manymillions have been placed in suitable northernwaters. There are three kinds of grayling inNorth America ; the Arctic species is Thy-mattus signifer, the Michigan fish T. tricolor, and the western form T. Montanus. It isno longer common in Michigan, but may bere-established by artificial propagation. The two southern forms are geographicallyisolated from the northern, and are doubtlessremnants from the post-Glacial range of thenorthern species. The grayling of Engl

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1900
• booksubjectzoology
• bookyear1901