Download or read book Manual of Methods of Measuring the Selectivity of Towed Fishing Gears written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Manual of Methods of Measuring the Selectivity of Towed Fishing Gears written by D. A. Wileman and published by . This book was released on 1996 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methodology Manual Measurement of Fishing Gear Selectivity written by Dickson, W and published by Fisheries and Oceans. This book was released on 1995-01-01 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fishing selectivity can be defined as the ability to target and capture fish by species, size, or sex (or a combination of these) during harvesting operations, allowing all incidental by-catch to be released unharmed. This manual outlines the steps and processes necessary to monitor selectivity demonstrations, collect data on selectivity, and validate scientific research on selectivity under normal fishing operations. Some mathematical and statistical examples are shown to clarify the methodologies and to facilitate understanding and application. The manual is intended to provide assistance to technicians and senior fishing crew in the planning, execution, and reporting of size and species trials and demonstrations with mobile and fixed gears. Sections of the manual cover measurement of selectivity, experiment design, experimental methods, data analysis, and the reporting of results. Case studies of experiments using both fixed and mobile gear are included.
Download or read book M thodes pour mesurer la s lectivit des engins de p ches manuel i e p ches manuel de methodol o gie et protocoles sp cifiques aux engins written by Canada. Ministère des pêches et des océans and published by Pêches et océans Canada. This book was released on 1999 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Fisheries Responsible Summary Methods of Measuring Fishing Gear Selectivity written by Canada. Department of Fisheries and Oceans and published by . This book was released on 1999 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fishery Bulletin written by and published by . This book was released on 2001 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Manual on Estimation of Selectivity for Gillnet and Longline Gears in Abundance Surveys written by Holger Hovgêrd and published by Food & Agriculture Org.. This book was released on 2008-04-29 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 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
Download or read book Fish Catching Methods of the World written by Otto Gabriel and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 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.
Download or read book Mortality of Fish Escaping Trawl Gears written by Petri Suuronen and published by Food & Agriculture Org.. This book was released on 2005 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress has been made in reducing bycatch and discards through improving the selectivity of fishing gear. This publication examines the key factors affecting the stress, injury and mortality of fish arising from fishing processes, particularly when fish escape from trawl equipment. It seeks to identify improved methodological approaches and practices, and to consider the design of fishing gears and operations that reduce or eliminate such deaths, and to assess the problems associated with estimating the impact of unaccounted fish mortality.
Download or read book Report of the Expert Consultation on Sustainable Fishing Technologies and Practices written by and published by Food & Agriculture Org.. This book was released on 1998 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tools for Oceanography and Ecosystemic Modeling written by André Monaco and published by John Wiley & Sons. This book was released on 2016-07-14 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studying the Ocean Planet requires measuring and sampling instruments to feed models that take into account its complexity. This book presents the diversity of observation and monitoring techniques at various scales, but also different kinds of model that take into account some conceptual schemes incorporating various scientific knowledge. Sampling is approached via the efficiency of fishing gears; underwater acoustics is used to detect, count, identify and listen to live and mobile living resources. Bio-logging allows us to rely on the behavior of marine animals to help investigate environments that are difficult to sample by conventional means, while listing the physiological changes they undergo. Modeling is presented not only in a functional framework, but also in an exploratory design incorporating various scenarios for ecosystem changes under the pressure of global change. This ninth volume completes the "Seas and Oceans" Set that adopts a transversal approach leading to the governance and sustainable management of the marine environment.
Download or read book Behavior of Marine Fishes written by Pingguo He and published by John Wiley & Sons. This book was released on 2011-06-09 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: BEHAVIOR OF MARINE FISHES BEHAVIOR OF MARINE FISHES: Capture Processes and Conservation Challenges Understanding fish behavior in relation to capture processes in marine fisheries is of fundamental importance to reducing bycatch and discards, and to enhancing marine fisheries conservation efforts. A thorough understanding of this allows commercial fishers to more effectively capture target species while reducing the catch of unwanted species. Behavior of Marine Fishes: Capture Processes and Conservation Challenges provides the reader with principles, patterns, and characteristics on fish behavior and fish capture processes using several types of important commercial fishing gears. The book also highlights conservation challenges facing the marine capture fisheries in efforts to maintain sustainable use of marine resources and to reduce negative impacts to the marine ecosystem. This volume, with contributions from leading applied fish behaviorists and fishing gear technologists from around the world, will be a valuable reference for researchers, fishing gear technologists, fisheries managers, students, and conservationists. SPECIAL FEATURES: Synthesis of current research and valuable knowledge that will help reduce bycatch and discards in commercial fisheries Review of basic fish behavioral principles and patterns and their relation to capture methods and conservation efforts Contributions from leading international applied fish behaviorists and fishing gear technologists
Download or read book Manual of Methods for Fish Stock Assessment Part III selectivity of Fishing Gear written by and published by . This book was released on 1977 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fisheries and Aquaculture in the Modern World written by Heimo Mikkola and published by BoD – Books on Demand. This book was released on 2016-09-28 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has nine chapters on Aquaculture Wetland Ecosystem Services Approach and Climate Change Adaptation, which explain how different aquaculture systems could maximize the benefits that society receives from both aquaculture production and the ecosystem services provided by wetland ecosystems. Sustainable development of aquaculture must take into account the societal value of ecosystem services for an efficient and environmentally sound production of food. Although some issues regarding the potential benefits and implementation of sustainable aquaculture remain, the consideration of food security and minimizing ecosystem impacts suggest that the time has come to take action. If we can efficiently farm the land, why can't we farm more the sea and inland waters?
Download or read book By catch Reduction in the World s Fisheries written by Steven J. Kennelly and published by Springer Science & Business Media. This book was released on 2007-07-18 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: With by-catch in fisheries becoming an ever more high-profile problem, this brilliant work could not be more timely. It contains contributions from the world’s leading experts in by-catch reduction, who guide the reader through most aspects of the field. They examine the methodologies used to develop by-catch reduction techniques and provide new avenues for broadening such work. Case studies are provided that encompass most of the world’s fishing techniques and regions.
Download or read book Innovations in Fishing Technology Aimed at Achieving Sustainable Fishing written by Alessandro Lucchetti and published by Frontiers Media SA. This book was released on 2023-11-20 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last fifty years, human exploitation of marine resources has become more efficient as the understanding of the habits and behaviour of the various species available in the sea gradually increased. Thus, technologies have developed naturally over time and fishing gears and practices have become more sophisticated. These technical advances in fishing gear have generally led to more efficient economic fishing operations and better access to resources. However, fishing implies the harvesting of marine organisms directly from their natural environment, therefore general awareness of environmental problems due to the exploitation of fishery resources has also increased. In particular, the poor selectivity of some gears is responsible for the capture of juveniles, immature and undersized specimens of many species, with negative consequences on the state of stocks. In addition, bycatch in marine fisheries is a major source of human-caused mortality of marine megafauna, often leading to the capture of vulnerable species. Finally, many bottom-towed gears are responsible for high impacts on bottom communities and habitats, with cascading consequences on the entire marine ecosystem. All these impacts can lead to changes in the structure, function and integrity of ecosystems, including effects on the food webs and multispecies predator-prey relationships.
Download or read book A third assessment of global marine fisheries discards written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2019-02-19 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: This third update of FAO’s global discard estimate adopted the ‘fishery-by-fishery’ approach employed in the second discards assessment published in 2005. The update included publicly available discard data in the last 20 years to establish a baseline of a time series of global marine fisheries discards. This is essential for monitoring the status and trends of discard management, which is the first step of the ecosystem approach to fisheries management cycle. In addition, the study developed a new fisheries data table incorporating landings data from the FAO Global Capture Production dataset (FishStat J) from 2010 to 2014, which allocated the landings to over 2 000 fisheries worldwide. The current study estimated that the annual discards from global marine capture fisheries between 2010 and 2014 was 9.1 million tonnes (95% CI: 6.7 – 16.1 million tonnes). About 46 percent (4.2 million tonnes) of total annual discards were from bottom trawls that included otter trawls, shrimp trawls, pair bottom trawls, twin otter trawls and beam trawls. The study included a synthesis of estimates of bycatch and discards of endangered, threatened and protected (ETP) species. Substantial advances have been made in quantifying fisheries interactions with such species so as to make informed decisions on their protection. However, many challenges remain, especially for small-scale fisheries. The development of standardized data collection techniques, risk-based sampling and sharing of data across agencies and regions will help to identify management priorities and allow implementation and enforcement of mitigation measures. A review of previous research showed that discard practices were often related to a wide range of factors, so it is difficult to assess the effectiveness of fishery management actions on the amount and practice of discards. Many regulations are inconsistently enforced, and their implementation is often less strict than intended. Piecemeal approaches in many bycatch and discards management measures can result in unintended cross-taxa conflicts, where regulations designed to reduce bycatch and/or discards of one species or species group may increase bycatch and/or discards of another. Examination of approaches to accounting for and mitigating against pre-catch, post-capture and ghost fishing mortalities demonstrates that an understanding of the relative importance of factors affecting indirect fishing mortality is necessary for estimating total fishing-induced mortality and for designing and implementing mitigation measures.
