Can a person say that a certain fish or specie is extinct?

Considering that only 5% of the worlds oceans have been explored. And that no person can track every fish in the ocean. Only oceans, not lakes and dam

Considering that only 5% of the worlds oceans have been explored. And that no person can track every fish in the ocean. Only oceans, not lakes and dams, etc.

or:Considering that only 5% of the worlds oceans have been explored. And that no person can track every fish in the ocean. Only oceans, not lakes and dams, etc.

or:Usually, people in that profession follow the fish and can target what areas they live, specifically. For some, yes. But, it's not always the case for others.

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