The Oceanarium is the big cinematic moment
The Oceanarium is the largest tank here: about 36 m (118 ft) across, 5.2 m (17 ft) deep, and filled with almost 4.5 million liters (about 1.2 million gallons) of water. The transparent tunnel runs for more than 80 m (262 ft), putting sand tiger sharks, sandbar sharks, rays, moray eels, and other Mediterranean species overhead and beside you. It is the reason even adults slow down.
Mediterranean tanks give the visit its local accent
Before and around the tunnel, the route is built around Mediterranean communities rather than anonymous blue scenery. The 16 Mediterranean tanks include recreated protected areas such as the Ebro Delta and the Medes Islands, so the aquarium keeps pulling the sea outside Barcelona back into view. That local thread is what makes this different from a generic indoor attraction.
Planeta Aqua changes the pace upstairs
Planeta Aqua moves the story beyond the main tanks into cold, deep, tropical, and freshwater environments. The space covers about 4,000 m² (43,056 ft²), with Humboldt penguins, rays in an open 20,000-liter (5,283-gallon) tank, living fossils, camouflage, symbiosis, and environmental themes. It is where repeat visitors should slow down instead of treating the aquarium as tunnel-only.
Explora! keeps children active
Explora! is the visit's child-facing reset button. More than 50 interactive elements invite children to touch, look, listen, investigate, and discover, while the settings echo the Ebro Delta, Costa Brava, and Medes Islands. For families, this matters because it turns the second half of the visit from passive looking into hands-on curiosity.
New digital spaces add a 2025 layer
The 30th-anniversary renovation added a more contemporary opening rhythm: a 300 m² (3,229 ft²) digital floor, the immersive Journey into the Depths room, and Aqua Protectors, where children create a digital fish and connect play with ocean-care messaging. These are the parts to prioritize if you visited years ago and want to see what has changed.