Updated‌David Casey gathered crayfish as part of The Helicopter Line's heli crayfish experience. Photo / SuppliedDavid Casey gathered crayfish as part of The Helicopter Line's heli crayfish experience. Photo / SuppliedA luxury helicopter and crayfish-gathering experience was marketed to tourists as showcasing “amazing fresh produce of New Zealand”. But it has now led to Invercargill diver David Casey being fined $3750 for illegally gathering crayfish for a Queenstown helicopter company and a hotel when neither party held a permit.