Do fishes normally lie on their side?

Fauzi and I were strolling down the city and looking for a place to have dinner with his friends when I stumbled upon this aquarium display outside a fancy chinese restaurant.

Do you notice the parrot fish lying on its back? I am sure all the other patrons of this restaurant had the same thing as I do running through their mind – “Yuck don’t order any fish dishes, the fish is probably sick or dying.”

I tried to look up for normal behaviors of parrot fishes and I came up with nothing. Is it normal for fishes to lie on their side to sleep?

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