Towards An Integrated Ecosystem Based Management
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Towards An Integrated Ecosystem Based Management






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    Towards An Integrated Ecosystem Based Management Towards An Integrated Ecosystem Based Management Presentation Transcript

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