Maximum Sustainable Yield

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Presentation transcript:

Maximum Sustainable Yield

Sustainable Yield Sustainable Yield: Maximum Sustainable Yield: The natural income that can be exploited each year without depleting the original stock or its potential for replenishment. Maximum Sustainable Yield: The highest amount that can be taken without depleting stock How many fish, and of what size can be taken in any year?

Carrying Capacity Depends on 3 things for a species: 1) the species reproductive strategy 2) how long individuals live 3) resources available in habitat/ecosystem Calculating Sustainable Yield Each year new individuals enter a population, and some leave If entering is greater than leaving, that amount can be harvested and is the maximum sustainable yield SY = (annual growth and recruitment) – (annual death and emigration)

Harvesting the Maximum Sustainable Yield Usually still leads to population decline because… Predictions aren’t always accurate Disease may strike or something else unaccounted for Sex ratios may get thrown off

Optimal Sustainable Yield Requires less effort Maximizes the revenue to cost ratio Much greater safety margin May still impact population size Fishing quotas usually set as a percentage of OSY per fleet per year. It is a weight, not a number of fish