By Bus: The buses that stop near Barcelona Aquarium are - V17 and 39, 45, 59, 91, 120, D20, H14, V13, V15. In case you have a pass to the Bus Turistic, take the Red Route and alight at the Port Vell stop. If you’re using the Barcelona City tours, alight on the Port Vell stop on the East Route.
By Metro: The closest metro stations are Drassanes (L3, green line) or Barceloneta (L4, yellow line) For L4 Barceloneta, get down at Barceloneta Metro station and for L3 Drassanes, get down at Drassanes stop. Both these stops are a walking distance away from the Barcelona Aquarium.
By Hop-On Hop-Off Bus: Both the Bus Turístic and the red buses stop at the Aquarium. For the Bus Turístic, you’ll want to take the red line that stops at Port Vell.
By Cycle: You can park your cycle at the Biking station at L’Aquàrium and it's a short walk to the aquarium from there.