They swim in dizzying circles, they go blind and they die slowly.
This is the miserable existence endured by many of the sea creatures kept in captivity.
Some of the most disturbing cases of animal abuse in living memory have unfolded at marine parks.
Behind smiling trainers posing for photos and animals performing tricks for cheering crowds, creatures are suffering in silence.
Animal rights activists have spent years trying to end the torment - but the horror stories keep emerging.







