I saw the show in 1991 and 1995 and I think it was abolished later that year. This is taken before the show and a dolphin can be seen in the water. Once they even had an Orca from my native Iceland in this tiny pool.
I'll assume that you know the bloke in the fancy white shirt and didn't manage to spot a relative! (although I have the feeling that you'd be able to). He was an assistant/guard at the show back then it seems, what does he do today?