Unit 4: Aquaculture - Fish Population Dynamics

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  • Fish Population Dynamics - fish is a renewable resource
    • Natural breeding rate higher than necessary
    • Maximum sustainable yield - greatest amount that can be sustainably harvested
      • Requires difficult information to be collected
        • Current total biomass
        • Annual biomass growth
        • Breeding rate
        • Survival rates of each age group
    • Over-exploitation of adult fish mean that population may decline as fewer young are produced = complete population collapse
      • Doesn't always reduce catch size - lots of juvenile fish caught
      • Fish reach catchable size after breeding = no population collapse
      • Fish reach catchable size before breeding = population destruction

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