04873nam 22006371 450 991046460270332120200520144314.0(CKB)3710000000075683(EBL)3239151(SSID)ssj0001128043(PQKBManifestationID)11639121(PQKBTitleCode)TC0001128043(PQKBWorkID)11058338(PQKB)10553530(MiAaPQ)EBC3239151(Au-PeEL)EBL3239151(CaPaEBR)ebr10815952(OCoLC)923762520(EXLCZ)99371000000007568320130403d2012 uf 0engur|n|---|||||txtccrFishing vessel execution of acoustic surveys for deep-sea species main issues and way forwardRome :Food and Agriculture Organization of the United Nations,2012.1 online resource (105 p.)FAO fisheries and aquaculture circular,2070-6065 ;no. 1059"FIRF/C1059 (En)".92-5-107105-5 Includes bibliographical references.""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 Ï?b 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 zoneâ€?""; ""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""FAO Fisheries and Aquaculture CircularsUnderwater acousticsCongressesFishing surveysCongressesFishery resourcesCongressesFish stock assessmentCongressesElectronic books.Underwater acousticsFishing surveysFishery resourcesFish stock assessmentFood and Agriculture Organization of the United Nations.MiAaPQMiAaPQMiAaPQBOOK9910464602703321Fishing vessel execution of acoustic surveys for deep-sea species1916320UNINA