Annex 7 Report of the Working Group on Fish Stock Assessment
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Annex 7 Report of the Working Group on Fish Stock Assessment (Hobart, Australia, 3 to 12 October 2016) Contents Page Opening of the meeting ...................................................................... 351 Organisation of the meeting and adoption of the agenda ............................... 351 Review of all available information and stock assessments for fisheries ............. 352 IUU activities ............................................................................... 352 Champsocephalus gunnari in Subarea 48.3 and Divisions 58.5.1 and 58.5.2 ......... 352 C. gunnari South Georgia (Division 48.3) ............................................ 352 C. gunnari Kerguelen Islands (Division 58.5.1) ...................................... 353 C. gunnari Heard Island (Division 58.5.2) ............................................ 354 Dissostichus spp. in Subareas 48.3, 48.4, 88.1 and 88.2 ................................ 355 Dissostichus eleginoides in Subarea 48.3 ............................................. 355 Management advice ................................................................. 355 D. eleginoides in Subarea 48.4 ......................................................... 355 Management advice ................................................................. 355 D. mawsoni in Subarea 48.4 ............................................................ 355 Management advice ................................................................. 356 Dissostichus spp. in Subarea 88.1 ..................................................... 356 Capacity .............................................................................. 356 Dissostichus spp. in Subarea 88.1 ..................................................... 357 Ross Sea shelf survey ................................................................... 358 By-catch .................................................................................. 358 Fishing operation characteristics ....................................................... 360 Future work .............................................................................. 364 Satellite tagging ......................................................................... 365 D. mawsoni in Subarea 88.2 ............................................................... 366 Research surveys in SSRUs 882A–B .................................................. 366 Amundsen Sea region (SSRUs 882C–H) ............................................. 368 Management advice ..................................................................... 370 D. eleginoides in Subarea 58.6 and Division 58.5.1 ..................................... 370 D. eleginoides Kerguelen Island (Division 58.5.1) ................................... 370 Management advice ................................................................. 370 D. eleginoides Crozet Islands (Subarea 58.6) ......................................... 371 Management advice ................................................................. 371 Research to inform current or future assessments in ‘data-poor’ fisheries (e.g. closed areas, areas with zero catch limits and Subareas 48.6 and 58.4) notified under Conservation Measures 21-02 and 24-01 ................................ 371 Exploratory fishery notifications in 2016/17 ............................................. 371 Making activities targeting toothfish consistent with CCAMLR’s regulatory framework ................................................ 372 Long-distance movement in toothfish .................................................... 373 Local biomass estimates of D. mawsoni and D. eleginoides in research blocks in Subareas 48.6 and 58.4 ........................................... 374 347 Management area research reviews ....................................................... 378 Dissostichus spp. in Subarea 48.2 ..................................................... 378 Subarea research overview .......................................................... 378 Chilean survey ....................................................................... 378 Ukrainian survey ..................................................................... 379 UK survey in the eastern area of Subarea 48.2 .................................... 380 D. mawsoni in Subarea 48.5 ............................................................ 383 Dissostichus spp. in Subarea 48.6 ..................................................... 384 Dissostichus spp. in Divisions 58.4.1 and 58.4.2 ..................................... 388 D. eleginoides in Division 58.4.3a ..................................................... 390 Management advice ................................................................. 391 D. eleginoides in Divisions 58.4.4a and 58.4.4b...................................... 391 Management advice ................................................................. 392 D. mawsoni in Subarea 88.3 ............................................................ 393 Notothenioids in Subarea 48.1 ......................................................... 393 Scheme of International Scientific Observation (SISO) ................................ 394 Non-target catch and interactions in CCAMLR fisheries .............................. 396 Fish and invertebrate by-catch ............................................................. 396 Bottom fishing activities and vulnerable marine ecosystems (VMEs) ................. 400 Marine mammal and seabird by-catch .................................................... 400 Marine mammal depredation ........................................................... 400 Seabird by-catch and mitigation ....................................................... 402 Hook marking scheme ............................................................... 402 Season extensions .................................................................... 402 Seabird by-catch ..................................................................... 403 Net monitoring cable mitigation .................................................... 403 Other issues .............................................................................. 404 Future work ................................................................................... 405 Secretariat’s data management systems .................................................. 405 Organisation of intersessional activities .................................................. 407 Notification of scientific research ......................................................... 407 Other business ................................................................................ 407 Advice ....................................................................................... 410 Future work ................................................................................. 410 Species profiles ............................................................................. 411 Parasites and lipid metabolism features of D. mawsoni ................................. 412 Marine debris ............................................................................... 412 Advice to the Scientific Committee and its working groups............................ 413 Adoption of the report ....................................................................... 415 Attributed statements ....................................................................... 415 Close of the meeting .......................................................................... 416 References ..................................................................................... 416 348 Tables ........................................................................................... 417 Figures ......................................................................................... 424 Appendix A: List of Participants ............................................................ 433 Appendix B: Agenda ......................................................................... 439 Appendix C: List of Documents ............................................................ 442 349 Report of the Working Group on Fish Stock Assessment (Hobart, Australia, 3 to 12 October 2016) Opening of the meeting 1.1 The meeting of WG-FSA was held in Hobart, Australia, from 3 to 12 October 2016. The Convener, Dr D. Welsford (Australia), opened the meeting and welcomed participants (Appendix A). As this meeting of WG-FSA was slightly shorter than previous meetings, Dr Welsford encouraged all participants to engage in discussion and where differences of views existed that these be presented as different testable hypotheses rather an simply as statements of positions. 1.2 Mr A. Wright (Executive Secretary) extended the Secretariat’s warm welcome to all participants and Mr T. Jones (Secretariat) provided an overview of the web-based meeting support provided by the Secretariat. Organisation of the meeting and adoption of the agenda 2.1 The work plan for WG-FSA at this meeting was focused on providing advice on: • non-target catch in CCAMLR fisheries • setting appropriate catch limits for research activities involving toothfish • methods for the analysis of toothfish catch data. Dr Welsford reminded the Working Group that, while some of the work of the meeting may be considered in subgroups, all substantive discussions, and particularly discussions leading to advice to the Scientific Committee, would be conducted in plenary. 2.2 The Working Group reviewed and adopted the agenda with the addition