Marineland has been the subject of many, many scandals and investigations (non-exhaustive, see Wikipedia for sources and a complete list): - illegally capturing dolphins - 15 premature orca deaths - 5 premature beluga deaths - the owner shot a fawn in the throat and let it bleed out - the park has mass graves for its animals on its property - the park has been investigated several times for its water quality, including after the death of a seal and injury of several others on loan from the Vancouver Aquarium
Anecdotally, from my last visit to Marineland (before I was aware of just how disgusting the park is) - the bears almost universally have patches of missing fur - the whales have almost no room to swim
I feel nothing but 100% vitriol towards Marineland. It's one giant animal abuse system, and this has been well documented by Ontario newspapers. The owner, John Holer, is an awful person who profits from the suffering of intelligent animals and I would like nothing better than to see him lose his fortune and spend time behind bars.
Thank you for prompting me to be more complete in my criticism of Marineland. Marineland is a disgraceful blight on Niagara and the province of Ontario in general. It should have been shut down decades ago.