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
    jquiroz@ifop.cl
    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
    anchovy
    common sardine
    April-May
    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
    whalesighting
  • 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