Identifier: annualreport101112190newy (find matches)
Title: Annual report
Year: 1902 (1900s)
Authors: New York (State). Forest, Fish and Game Commission
Subjects: Forests and forestry Fisheries Game and game-birds
Publisher: (Albany, N.Y. : The Commission)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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ection is strongly suggested. The minute animal organisms which causedisease have not until very recently been grown in artificial media, andeven at present, though cultures of the trypanosomes have been obtained,no methods of general applicability are available. The pure culture is thechief means by which the present extensive knowledge of bacteria has beenobtained and its lack with protozoa curtails immensely the sources ofinformation concerning them, and makes it practically impossible todemonstrate by inoculation the causal relation of specific protozoato a given disease. Moreover, the resemblance of certain of the nor-mal morphological elements of the tissues of the host to protozoanforms, adds to the obscurity of protozoan infection, and to the difficultyof diagnosis. Nevertheless, fish disease due to microscopic animal organisms havinga general distribution throughout the body, and, therefore, of the septi-caemic type are recognized and several have been described from European
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(I) D zzJ< DI tra0 I (J) OQ< Q00 FOREST, FISH AXD GAME COMMISSIONER. 153 sources.* In this country a disease of brook trout upon Long Island hasbeen ascribed to a hitherto unknown protozoan.f This was at Northport,and within about nine miles of the present outbreak. In external appear-ance, the marks upon the dying fishes in these two diseases were similar andcreated a presumption at the outset of their identity. At several other placeson Long Island, epidemics have occurred during the past few years whichare reported to resemble these, and it is not improbable that in the restrictedregion of this island the same causes are at work to produce among themany broods of trout which are there held in domestication severe epidemicsattended with a high mortality. Examination of fresh unstained tissues or blood, of the dying and deadtrout, reveals practically no definite knowledge concerning the parasite.Neither are preserved and stained preparations easily interpreted. The bal-ance of

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