Download or read book A Biological Examination of Lake St Clair written by Jacob Ellsworth Reighard and published by . This book was released on 1894 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Biological Examination of Lake St Clair Classic Reprint written by J. E. Reighard and published by . This book was released on 2015-07-22 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from A Biological Examination of Lake St. Clair The remedy does not lie in restrictive legislation; it lies rather in an increasing of the effectiveness of methods of artificial propagation and perhaps also in an increase of the annual output of artificially hatched fish. "The first view is held for the most part by fish culturists, who favor restrictive legislation and increased facilities for artificial propagation. "The second view is held for the most part by fishermen, many of whom are not yet convinced of the value of artificial propagation. "When one who is neither fish culturist nor fisherman attempts to discover the grounds upon which the various opinions are based, he very soon finds that there are but few recorded facts. "In order to know whether the number of whitefish is increasing or diminishing for any locality or for all localities, it is necessary to have statistics extending over a term of years. Statements based on statistics which are taken in two years separated by an interval of five or ten years are nearly valueless for purposes of comparison for the reason that such statistics do not and cannot take into account the climatic conditions which make one year favorable and another year unfavorable. The fact that in the year 1880 the number of whitefish marketed was greater than in 1890 does not prove that the number of whitefish has diminished in this interval; it proves only that the number caught in 1890 was less than the number caught in 1880. This may have been due to a diminution in the number of fish, but it may also have been due to storms during the fishing season of 1890. Statistics to be conclusive should enable us to compare the average yield for the ten years 1870 to 1880 with the average yield for the ten years 1880 to 1890. "No such continuous series of statistics is in existence, so that.the assertions concerning a diminishing yield of whitefish rest either on a comparison of these statistics of isolated years or on the statements of fishermen concerning certain localities. "If we inquire into the facts concerning the sufficiency of the present methods of artificial propagation, we find that so far as concerns the whitefish there is no question as to the success of the earlier stages of the process. Several hundred million ova are taken annually and placed in the hatcheries and of these usually from 80 to 90 percent are hatched and placed in the waters of the Great Lakes - 165,000,000 in Lake Erie alone in 1888. "This is very nearly all that is known about these young whitefish. About their food habits we know only that in captivity that they eat certain species of Crustacea. Whether in their natural habitat they eat other animals in addition to these Crustacea or in preference to them we do not know. It is uncertain at what age they begin to take food or how much they require. We do not know their natural enemies. We do not know whether they thrive best in running water or in standing water, in shallow water or in deep water, whether at the surface or near the bottom. What changes of habitat or of food habits the fish undergo as they grow older is a still deeper mystery. "Our problem is to place young whitefish in the Great Lakes under such conditions that as large a number as possible of them shall grow into adult fish. It is clear that of one of the elements in this problem namely, the whitefish, we know but little. "What, then, do we know of the other elements of the problem, the Great Lakes themselves? About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
Download or read book A Biological Examination of Lake St Clair written by Michigan State Board of Fish Commission and published by Sagwan Press. This book was released on 2018-02 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book A Biological Examination of Lake St Clair Primary Source Edition written by Michigan. State Board Of Fish Commission and published by . This book was released on 2013-12 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Plants of Lake St Clair written by A. J. Pieters and published by . This book was released on 1894 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Biological Examiation of Lake St Clair written by Jacob Ellsworth Reighard and published by . This book was released on 1894 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Biological Examination of Lake Michigan in the Traverse Bay Region written by Henry Baldwin Ward and published by . This book was released on 1896 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Ecology of Lake St Clair Wetlands written by Charles E. Herdendorf and published by . This book was released on 1986 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Biological Examination of Lake Michigan in the Traverse Bay Region written by Henry Baldwin Ward and published by . This book was released on 1896 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Plants of Lake St Clair written by Adrian John Pieters and published by . This book was released on 1894 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biological Report written by and published by . This book was released on 1985 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report of the Commissioner for written by United States Fish Commission and published by . This book was released on 1905 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cyclopidae Calanidae of Lake St Clair Lake Michigan Certain of the Inland Lakes of Michigan written by Charles Dwight Marsh and published by . This book was released on 1895 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Limnological Survey of Eastern and Central Lake Erie 1928 29 written by Charles John Fish and published by . This book was released on 1960 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Results of a cooperative survey of the central and eastern basins of Lake Erie in 1928-29 by the U.S. Bureau of Fisheries, New York State Conservation Department, Ontario Department of Game and Fisheries, Health Department of the City of Buffalo, and the Buffalo Society of Natural Sciences are presented in a series of papers. Physicochemical data include seasonal, vertical, and horizontal variations in temperatures, water movements, dissolved oxygen, carbon dioxide, phenolphthalein and methyl-orange alkalinity, pH, chlorides, and turbidity. The species composition, seasonal abundance, and distribution of micro- and macroplankton are discussed in detail. Special consideration is given to the influence of polluted river waters which flow into the lake. It is concluded that the lake is remarkably free from chemical and sewage pollution. Evidence of pollution farther than 1 mile from possible sources was detected at only 2 stations. The nutrient level of Lake Erie is high and the lake should support large fish populations.
Download or read book The Distribution and Economic Importance of Mullusca in Lake Nipigon written by A. F. Coventry and published by . This book was released on 1922 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transactions of the Wisconsin Academy of Sciences Arts and Letters written by Wisconsin Academy of Sciences, Arts, and Letters and published by . This book was released on 1898 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. for 1870/72-1926 include: Proceedings, and: List of members of the academy.
Download or read book The Ecology and Economics of Oneida Lake Fish written by Charles Christopher Adams and published by . This book was released on 1928 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
