One of the Fin Brothers, Clark, campaigning aboard the Esperanza to protect tuna stocks and other ocean species from overfishing in the Pacific. The Fin Brothers are part of the Greenpeace campaign urging Sealord and New Zealand's main brands of canned tuna to change to sustainably caught tuna. Currently canned tuna sold in New Zealand is bought from companies using fishing methods which kill endangered sharks, turtles, juvenile tuna and other ocean species.