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Establish/maintain healthy ecosystem
    •    measured by:
        o    biodiversity
        o    population size
        o    normal age distribution
        o    predator/prey levels
    o    robustness (to change)
sustainable harvest
    •    dynamic ecosystem equilibrium
    •    no major (negative) anthropogenic fluxes in biomass/diversity
        o    don't want human actions to cause die-off of species
    •    rebuilding stocks
    •    recovery of crashed populations
    •    economic stability