Survey of Pitcairn Islands marine environment revealed a rich biodiversity of fish , coral and algae . Score: 6 Around 1,250 marine species recorded but scientists believe many more remain undiscovered . The Pitcairn Islands might only have 55 human inhabitants , but the waters surrounding them are teeming with marine life . `` These places allow us to know what the ocean was like before heavy human impacts , '' expedition report says .
Survey of Pitcairn Islands marine environment revealed a rich biodiversity of fish , coral and algae . Score: 6 Around 1,250 marine species recorded but scientists believe many more remain undiscovered . `` These places allow us to know what the ocean was like before heavy human impacts , '' expedition report says .