There is a restaurant at the end of the tour that serves a variety of food, but it is not necessarily in the aquarium.
There is a cafeteria at the end of the aquarium. I would say you will probably spend $12 to $20 a person for a meal.
I didn't notice a restaurant attached to the aquarium other then food stands right outside. There is a pier just west of the aquarium with plenty of options for food and its walking distance from the aquarium.
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