An Evaluation of Gill Nets of Various Mesh Sizes
Author: Gerald Adkins
Publisher:
Published: 1982
Total Pages: 74
ISBN-13:
DOWNLOAD EBOOKPosts
An Evaluation of Gill Nets of Various Mesh Sizes (Classic Reprint)
Author: Gerald Adkins
Publisher: Forgotten Books
Published: 2018-01-08
Total Pages: 140
ISBN-13: 9780428090388
DOWNLOAD EBOOKExcerpt from An Evaluation of Gill Nets of Various Mesh Sizes The nature of fishing conflicts have varied some what through history, but the method of taking fish was usually a central issue in any controversy. Nets and/or netting have always caused conflicts among factions fishing the same region or harvesting simi lar species. Nets are one of the oldest means of catch ing fish; the Bible documents their use by 11 of the 12 Apostles approximately years ago. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Fish Catching Methods of the World
Author: Otto Gabriel
Publisher: John Wiley & Sons
Published: 2008-04-15
Total Pages: 536
ISBN-13: 0470995637
DOWNLOAD EBOOKIn the sixteen years since the last edition of Von Brant’s classic work was published, fishing and fisheries have undergone vast changes. Not only has there been great progress in the development of new tools, materials and techniques, but the industry has seen an increasing need to address controversial issues such as declining fish stocks, enormous quantities of bycatch and discard and the impact of towed fishing gear on the environment. Fully revised and updated to reflect such changes, the fourth edition of this widely read and popular book offers: A unique, comprehensive survey of the evolution of fishing methods throughout the world Approximately 750 illustrations showing the extensive range of methods, techniques and equipment used in fishing across the globe Fishing gear classified according to the FAO system Additional chapters: Fishing Effects on Fish Stocks and Environment and Fishery and Gear Research All researchers, fisheries scientists, fisheries students, administrators and libraries in universities and research establishments where fish and fisheries are studied and taught will find this book a valuable addition to their shelves. Commercial and sports fishermen will also find Fish Catching Methods of the World a fascinating and vital reference.
Evaluation of Trawls for Monitoring and Harvesting Fish Populations in Lake Oahe, South Dakota
Author: William Roland Nelson
Publisher:
Published: 1974
Total Pages: 16
ISBN-13:
DOWNLOAD EBOOKTrawls of various designs and sizes were compared to evaluate their use for monitoring and harvesting fish populations in Lake Oahe. Catches of a 20.7-m semiballoon trawl, selected to monitor changes in the fish populations from 1965 to 1970, showed a downward trend in the abundance of all species, except walleye; the decline was largest in the lower area of the reservoir with a slight increase in the upper area. Of two trawl designs tested, semiballoon trawls captured more fish per hour than high-rise trawls, and a 15.9-m semiballoon trawl with a 3.8-cm mesh cod end captured fish at the highest and most consistent rate. The size and species composition of the fish caught in small-mesh trawls differed from thos caught in trap nets. Trawl cataches were too small to recommend or warrant their use as a commercial fishing gear, but the use of both small mess trawls and trap nets should improve accuracy in monitoring fish populations in this reservoir.
Manual on Estimation of Selectivity for Gillnet and Longline Gears in Abundance Surveys
Author: Holger Hovgêrd
Publisher: Food & Agriculture Org.
Published: 2008-04-29
Total Pages: 96
ISBN-13: 9789250044613
DOWNLOAD EBOOKThis manual defines methods for estimating selectivity of gillnet and longline gears, with particular reference to the use of these gears in abundance surveys. The manual illustrates how gear design, the basic concepts of size selection and fish morphometric data can be used to model selectivity. Statistical estimation methods are described in detail, and examples given of their application in spreadsheets. The efficient use of these gears in abundance and research surveys is also discussed. Although the manual concentrates on gillnets and longlines, the methods given are general enough to be relevant to any research involving gear selectivity
Fish Field and Laboratory Methods for Evaluating the Biological Integrity of Surface Waters
Author: Donald J. Klemm
Publisher:
Published: 1993
Total Pages: 372
ISBN-13:
DOWNLOAD EBOOKCommercial Fisheries Review
Author:
Publisher:
Published: 1954
Total Pages: 532
ISBN-13:
DOWNLOAD EBOOKAn Updated World Review of Interactions Between Marine Mammals and Fisheries
Author: Simon P. Northridge
Publisher: Food & Agriculture Org.
Published: 1991
Total Pages: 68
ISBN-13: 9789251030547
DOWNLOAD EBOOKRecent information on marine mammal - fishery interactions is reviewed. A species by species approach is taken for each of the major marine fishing areas of the world. Most recent studies have been devoted to the accidental entanglement or mortality of marine mammals in fishing operations. Several species or populations of marine mammal may be threatened with extinction or severe depletion from such interactions. Most of the fisheries involved are gillnet fisheries. Relatively few recent studies have addressed the possible competitive interactions between marine mammals and fisheries for food and fishery resources.
