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Towards An Integrated Ecosystem Based Management


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Towards An Integrated Ecosystem Based Management

  1. 1. Towards an integrated ecosystem-based management: What is necessary in Chile?<br />JC Quiroz<br />División de Investigación Pesquera<br />Instituto de Fomento Pesquero<br /> <br />Using Target and Limit Reference Points in Low-Trophic Level Fisheries<br />
  2. 2. Small-pelagic fisheries<br />Anchovy northern<br /><ul><li>Anchovy northern-central
  3. 3. Anchovy and common sardinecentral-southern
  4. 4. Fuegian sprat</li></li></ul><li>TheChileanfisheriesmanagement (1/2)<br />The small-pelagic case<br />The exploitation strategies have been done through annual Total Allowable Catches (TAC&apos;s)<br />Based on reference fishing mortality<br />Using an overall exploitation criterion  P(Ft&gt;F60%)&lt;0.1<br />Two reviewing TAC processes a year<br />
  5. 5. January<br />Recruitment surveys<br />Stock Assessment<br />anchovy<br />common sardine<br />April-May<br />Autumn surveys<br />
  6. 6. TheChileanfisheriesmanagement (2/2)<br />Others important low-trophic level fisheries<br />Crabs, squat lobsters and shrimps species <br />December  agreement on the TAC’s<br />Based on reference exploitation rate (µ=Y/B)<br />Using an overall exploitation criterion <br /> P(µt&gt;[0.12-0.17])&lt;0.1 (decline biomass)<br /> P(µt&gt;[0.12-0.17])&lt;0.5 (stable biomass)<br />
  7. 7. … has been done via only mono-specific stock assessment models and trend over the surveys biomass estimates<br />Nevertheless, several papers have called attentionabouttrophic interactions and community structure of commercial fishery species off Chile<br />But, some drawbacks emerge …<br />Until now, the management …<br />
  8. 8. Neira et al. (2004)Ecological Modelling<br />The problem is:<br />“Searching the Ecopath ratios”<br />In Chile, the knowledge on fundamental P/B, Q/B, EE, DC ratios is fragmentary at best<br />
  9. 9. Predation-preyinteraction<br />Impacts of both fishing and Dosidicusgigaspredation on the projections of Chilean hake…What about the cycles and the correlation-time structure?<br />
  10. 10. While these work undoubtedly will contribute to the knowledge ecosystem, it is still necessary to guide them towards a common goal, the Ecosystem Approach to Fisheries (EAF) <br />How it can be put into practice?<br />
  11. 11. Developing Ecological Indicators for Fisheries Management<br />From scientific observer and monitoring programs<br />Cath, effort, length, reproduction, by-catch, misreport, species proportion, etc.<br />Target and not-target species<br />Others observations<br />number of dead birds caught in longline<br />whalesighting<br />
  12. 12. Developing Ecological Indicators for Fisheries Management<br />From fishery-survey methods<br />Acoustic (small-pelagics, others pelagics, demersal)<br />Trawl (crustaceans)<br />fishery-independent time series data<br />Aggregations’ measurements <br />Biological data (larval, length, weight, sex by specie)<br />Acoustic characterization of the aggregations<br />Oceanographic data<br />
  13. 13. … two purposes are identified to managing the impacts of fishing on marine ecosystem:<br />performance measurement of themanagement objetives<br />It can be used as a part of decision rules to determine adaptive management<br />Ecological indicators …<br />Fulton, E. A., Smith, A. D. M., and Punt, A. E. 2005. Which ecological indicators can robustly detect effects of fishing? e ICES Journal of Marine Science, 62: 540-551.<br />
  14. 14. … Is necessary an Integrated Ecosystem Monitoring , Diagnostic and Evaluation<br />(like single-species fishery management , these represent my own view)<br />
  15. 15. Why?<br />
  16. 16. and sorry if I make any English mistake<br />Thank you<br />