Fishes of the Yellowstone National Park: With Description of the Park Waters and Notes on Fishing (Classic Reprint)
Автор:Hugh M. Smith Год: 2012 Издание: [не указанo] Страниц: 36 ISBN: 1440076022 Government agencies that are striving to maintain the fish supply. The present report is a revised and amplified edition of the one published by theB ureau ofF isheries in 1915. The exhaustion of the supply of that document and the continued public demand for information on this subject, together with the availability of new data on the fishes, make this publication desirable. INDIGENOUS FISHES. The native fish life of the park was profoundly affected by the great lava flow which occurred over a large part of the park in Pliocene times. Whatever fishes were then present were necessarily killed, and, with the reestablishment of the watercourses after the cooling of the surface of the lava, fishes in outside waters were to a great extent prevented from reaching the lofty plateau, which comprises most of the area of the park, by the high and steep falls over which the streams leave the lava beds. It thus follows that the native fish fauna of the park is very limited. Except in...
