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Human interactions and Fisheries

Ethan Ross 30 perguntas 1,0 (1 avaliação)

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Perguntas do quiz (30)

  1. 1Fisheries science
    Fisheries management is all about modelling (predicting) the likely [blank_start]size or biomass of target[blank_end] fish species of distinct size/age classes
    Critical factor is the [blank_start]recruitment[blank_end].

    Recruitment – number of fish reaching a certain [blank_start]age/size[blank_end] or [blank_start]position in the life cycle[blank_end] - when they enter the fishery.

    1. Asize or biomass of target
    2. Brecruitment
    3. Cage/size
    4. Dposition in the life cycle
  2. 2Stock assessment
    Fundamental basics – level of fishing [blank_start]mortality[blank_end] must be balanced by [blank_start]recruitment[blank_end] and [blank_start]growth[blank_end]
    If max mortality level is exceeded, stock will [blank_start]fall[blank_end], and capacity to [blank_start]rebuild[blank_end] will be reduced

    1. Amortality
    2. Brecruitment
    3. Cgrowth
    4. Dfall
    5. Erebuild
  3. 3Important terms:
    Recruit: A fish that [blank_start]survives[blank_end] from egg until reproductive (or legal fishery) age

    [blank_start]Yield[blank_end]: numbers of fish (or value) produced by the recruits and available to the fishery

    Collapse – point where a fished population or stock cannot [blank_start]sustain itself[blank_end]. May be arbitrarily set at [blank_start]10%[blank_end] of pre-fished biomass (or 50% MSY)

    [blank_start]Stock[blank_end] – part of a species population that is reproductively isolated and managed as a single unit
    1. Asurvives
    2. BYield
    3. C10%
    4. DStock
    5. Esustain itself
  4. 4Fishery at MSY
    In theory, fishing at MSY is desirable for all:

    Keeps fishing level and stock size relatively high – approx. [blank_start]50%[blank_end] of maximum stock size

    Management aim is to regulate fishing to keep population size at MSY

    1. A50%
  5. 5Summary MSY and stock assessment
    Typically fishing at MSY keeps the biomass lower (c. 50-75% lower) than the unfished biomass –

    Fishing to MSY is risky – if the [blank_start]environment[blank_end] changes it can be easy to [blank_start]overestimate[blank_end] MSY

    MSY usually estimated by species – but species interact: [blank_start]ecosystem[blank_end] approach may be better…
    1. Aenvironment
    2. Boverestimate
    3. Cecosystem
  6. 6Growth in fish supply outpaces [blank_start]population growth[blank_end] (3.2% per year vs 1.6% per year)

    Mostly met by aquaculture, mostly in [blank_start]China[blank_end]
    1. Apopulation growth
    2. BChina
  7. 7Global marine capture c. 80 million tonnes:
    10% [blank_start]tuna and tuna-like[blank_end] species



    Expansion in NW and WC Pacific, Indian Oceans, contraction in Atlantic and Mediterranean



    [blank_start]58 Million[blank_end] people engaged in capture fisheries worldwide
    1. Atuna and tuna-like
    2. B58 Million
  8. 8aquaculture

    [blank_start]6%[blank_end] growth per year: 94 million tonnes in 2012, of which 66 Million tonnes is food fish, 23 Million tonnes aquatic algae.

    China c. [blank_start]50%[blank_end] of global production

    20 million people are engaged in aquaculture (>90% in China)
    1. A6%
    2. B50%
  9. 9social

    Fish capture and production large source of [blank_start]employment[blank_end] for women (especially in developing countries)

    More than 15% primary capture employment women and up to 90% processing employment

    Fishing and aquaculture assure livelihoods of c. [blank_start]10%[blank_end] of world’s population
    1. Aemployment
    2. B10%
  10. 10Trends – doom and gloom?

    Collapsed species
    Fishing down food chain
    Fishing deeper
    Loss [blank_start]apex predators[blank_end]
    PP utilized

    1. Aapex predators

Informações

Descrição
Human interactions and Fisheries
Idioma
English
Visualizações
76
Avaliação
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