8 tons of whale mince is going to need a hell of a lot of seagull. Just poking a hole or three in it to let the gasses out then hauling it into the sea seems an option ( but IANA whale carcass disposal expert)
Don't ask me :D I just took the info from the article.
On the other side, given I'm half Croatian, seagulls and other meat-eating birds will absolutely devour that meat in no time - they will lead other flocks of birds to the food source.
