I don't think it is an automatic recovery if you leave them alone. We have seen many water bodies closed for recovery and they never come back or slower then expected. Look at Maritime Cod fishery, north alberta parabelem. Some times something happened long time ago that allowed these fish to get a biomass that could allow it to overcome predation and become unbalanced in there favor. Unless these conditions occur again no guarantee of recovery and it might have taken them 100s of years to achieve this.
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