...not to be confused with the Dallas Zoo's crappy aquarium? The Dallas Zoo does not have an aquarium. There is an aquarium at Fair Park that is associated with the Dallas Zoo. Maybe that's the one you are referring.
Best Outing with the Kids Dallas 2001 - The Dallas World Aquarium
1801 N. Griffin
Dallas, TX 75202
Readers' Choice: Dallas Zoo, 650 S. R.L. Thornton Freeway, 214-670-5656
The Dallas World Aquarium (not to be confused with the Dallas Zoo's crappy aquarium) is one of the few places that is kid-friendly, air-conditioned and has something to offer beyond a mall or movie theater. The aquarium has exotic plants, animals and aquatic life. Kids will get a particularly big kick out of the colony of South American black-footed penguins and the Antillean manatees. Unlike some other aquariums that won't be named, the wildlife in the Dallas World Aquarium appears well cared for with clean fish tanks and other holding areas.