What can you do with dolphins?

In Minecraft, there are dolphins. Can you tame them? I am playing on the Xbox 360 version.

Solution 1:

Dolphins in Minecraft are not rideable. However, there is an achievement on the Xbox 360 version of the game that is associated with them:

Echolocation: Feed a dolphin fish and have it lure you to treasure.

Only one fish is needed to feed the dolphin for the achievement, but it must specifically be raw fish and not cooked fish - I can confirm that raw cod works, and I believe that raw salmon does too.

(From the Minecraft wiki's page on dolphins.)

Solution 2:

In addition to Lamprey's answer, when swimming near dolphins, they can boost your swimming speed greatly. This will happen automatically simply by swimming near them