Managing the Welfare of Marine Mammals at Mass Strandings in Golden Bay, New Zealand

Abstract

Mike Ogle Abstract In this chapter, issues of marine mammal welfare are illustrated through recounting three mass stranding events of long-finned pilot whales which occurred in Golden Bay, New Zealand. For two of the mass strandings discussed, both were reported soon after the whales stranded and had good access and high numbers of volunteers assisting Department of Conservation (DOC) staff. One of these strand-ings had a high refloating success rate (89% of 345 whales), the other a moderate success rate (39% of 198 whales). This contrasted with the third stranding (com-prising of 105 whales) which occurred in a remote location with difficult access and was first observed from an aircraft, 1 or possibly 2 days after the initial strand-ing. When DOC staff arrived at this remote site, less than one quarter of the pod was still alive, and these were suffering considerably. Given the whales' poor condition, high degree of suffering and low chance of survival, they were euthanised following DOC guidelines. These three mass strandings were rela-tively large and if combined accounted for approximately one third of the nearly 2000 cetaceans that stranded in Golden Bay between 1990 and 2016. New Zealand has a relatively high occurrence of strandings, with an average of 300 cetaceans stranded annually in the last 26 years. Stranding events are recorded on the New Zealand Whale and Dolphin Stranding Database, which is maintained by the DOC. This government organisation has statutory responsibility for management of marine mammals under the Marine Mammal Protection Act. Its role, obliga-tions under the Treaty of Waitangi and use of volunteers at mass strandings are briefly described.