Home — Sea Shepherd Conservation Society Sea Shepherd’s sole mission is to protect and conserve the world’s oceans and marine wildlife. We work to defend all marine wildlife, from whales and dolphins, to sharks and rays, to fish and krill, w Sea Shepherd’s sole mission is to protect and conserve the world’s oceans and marine wildlife. We work to defend all marine wildlife, from whales and dolphins, to sharks and rays, to fish and krill, without exception.