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- Ostrom principles 1
- Otholoths 1
- Outlook 3
- Outwelling 1
- Ovefishing 1
- Over exploitation 1
- Over-exploitation 7
- Overexploitation 5
- Overfishing 15
- overfishing 1
- overfishing, 1
- Overflows 1
- Overgrazing 1
- Oxidation 1
- Oxygen 1
- Oxygen consumption 1
- Oyster 2
- Oyster farming 1
- Oyster fish 1
- Oyster fisheries 1