Fishing Vessel Execution Of Acoustic Surveys For Deep-Sea Species : Main Issues And Way Forward.

Intro -- PREPARATION OF THIS DOCUMENT -- ABSTRACT -- CONTENTS -- 1. INTRODUCTION AND BACKGROUND -- 1.1 Introduction -- 1.2 Background -- 2. INSTITUTIONAL AND ORGANIZATIONAL ISSUES -- 2.1 Who this report is intended for -- 2.2 Why there is an issue -- 2.3 Strategic and tactical considerations -- 2.4 Requirements that must be met for stock assessment -- 3. APPLICATIONS AT SEA AND OPERATIONAL CHALLENGES -- 3.1 Operational characteristics -- 3.2 Role of incentives/disincentives -- 3.3 Integrating surveys with commercial fishing activities -- 3.4 Echo mark identification -- 4. VESSELS AND EQUIPMENT -- 4.1 Introduction -- 4.2 The echosounder -- 4.3 Frequency considerations -- 4.4 Choice of vessel -- 4.5 Location of transducers -- 4.6 Calibration -- 4.7 Opportunities for introduction of new technologies -- 5. SURVEY METHODS -- 5.1 Strategic considerations -- 5.3 Area-based surveys -- 5.4 Multiple surveys -- 5.5 Deciding which data to use for estimation of abundance -- 6. ACOUSTIC DATA PROCESSING -- 7. ACOUSTIC BACKSCATTERING CROSS-SECTION VALUES -- 7.1 Importance of proper specification -- 7.2 Problems associated with use of σb and sv values -- 8. ESTIMATION OF ABUNDANCE -- 8.1 Introduction -- 8.2 Area-based surveys -- 8.3 Aggregation-based surveys -- 8.4 Comparison of estimators -- 9. UNCERTAINTY OF RESULTS -- 9.1 Sources of uncertainty -- 9.2 Sampling error -- 9.3 Determination of species composition -- 9.4 Backscattering cross-section -- 9.5 Fish distribution and behaviour -- 9.6 Weather -- 9.7 Seafloor acoustic "dead zone" -- 9.8 Calibration error -- 9.9 Other errors -- 10. IMPORTANCE OF COLLECTION OF BIOLOGICAL DATA -- 10.1 Data to be collected -- 10.2 Species composition of the catch -- 10.3 Length and weight frequency data -- 10.4 Records of bycatch -- 10.5 Sex composition and status of gonads -- 10.6 Otoliths.

11. INCORPORATING INDUSTRY SURVEY RESULTS INTO THE ASSESSMENT AND MANAGEMENT PROCESS -- 11.1 Stock assessment -- 11.2 Indices of abundance -- 11.3 Fishing vessel data and stock assessments -- 12. FUNDING OF ACOUSTIC SURVEYS -- 12.1 Funding considerations -- 12.2 Cost items -- 12.3 National applications -- 13. DISCUSSION -- 13.1 Common views -- 13.2 Communication with vessel crews -- 13.3 Research strategies -- 14. WORKSHOP RECOMMENDATIONS -- 14.1 General recommendations -- 14.2 Applications at sea and operational challenges -- 14.3 Vessels and equipment -- 14.4 Operational protocols -- 14.5 Collection of biological data -- 14.6 Acoustic data processing -- 14.7 Estimating and estimates of acoustic backscattering values of deepwater species -- 14.8 Estimation of abundance -- 14.9 Uncertainty (error in estimates) -- 14.10 Costs involved in commercial vessel stock assessment and funding issues -- 15. REFERENCES -- APPENDIX A List of participants -- APPENDIX B Agenda -- APPENDIX C Examples of Trip Survey Summary Report and Echo Mark Encounter Log -- APPENDIX D Example of a Joint Project Agreement: Support for conducting Atlantic herring spawning ground acoustic surveys in Scots Bayand other spawning areas of Southwest Nova Scotia -- APPENDIX E Example of Agreement for Fishing Vessel - Management Authority - New Zealand.

Description based on publisher supplied metadata and other sources.

Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, 2024. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries.