Annual report (1903) (14751641692)

Flat Fish Pseudopleuronectes americanus
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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ner or later passed andthe condition may be described as overcrowding. With respect to Cold Spring Harbor the conditions of food, ponds, andwater supply were much as they had been in the past, but the number oftrout carried had been materially increased during the year preceding theoutbreak of disease. Here then is believed to be an application of the prin-ciples above discussed, which are merely the extension to fish culture ofalready well-known laws recognized in the science of human disease. Otherinstances of trout epidemics following overcrowding are not wanting and willcontinue to come under the observation of trout culturists. Among a stock of trout dying from this disease, or from any generalinfection, a considerable portion may usually be saved by transferring themto much larger quarters, as to a large natural pond of cold water or to areach of a natural stream in which they may be retained by screens. Thiswill not of course immediately put a stop to all loss among such trout.
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oJ< I ID D z<0 5ui < (/)Uih0UI z0(C UI J Q. 0Q D ui<fl a. ICDL h< JL FOREST, FISH AND GAME COMMISSIONER. 157 Those far advanced in the disease will die, others will recover and the yetuninfected fish will be able to avoid taking up infection. These results arebrought about both by diluting the infection and by an increase of resistingpowers due to the natural conditions. A shallow stream of rather rapidflow is of course more favorable than a sluggish one. Xo one measure or single specific can be recommended as sufficient toinsure with certainty against this and similar diseases, nor to prevent withcertainty their recurrence. Avoidance of overcrowding is necessary, is acondition precedent to freedom from such diseases. The positive measureswhich are practicable and which decrease the chances of infection relate todisinfection in connection with impervious pond construction. Disinfectionof ponds consists in killing the organisms of disease which, especially duringand afte