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 .
Survey of Pitcairn Islands marine environment revealed a rich biodiversity of fish , coral and algae . Pew Environment Group hope to turn British Overseas Territory into a vast marine reserve . 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 .