"The Goldfish"
Mythology: As it is a newer constellation, there is no classical mythology associated with this constellation. Its origin is under debate: Credit is often given to the Dutch Navigators Pieter Dirkszoon Keyser and Frederick de Houtman who charted the Southern skies from 1595-1597, while other sources give credit to Johann Bayer as being the first to describe this constellation several years earlier. It is not named after the pet goldfish, but rather after the Mahi-mahi, a Hawaiian fish.
Other Interesting Sights: The Large Magellanic Cloud is within this constellation. The Large and Small Magellanic Clouds were first observed by Ferdinand Magellan in 1519 and are satellite galaxies to our own Milky Way Galaxy, approximately 160,000 light years away. The Large Magellanic Cloud is actually spread out over three constellations -- Dorado, Tucana, and Mensa. Within the Large Magellanic Cloud is the fascinating Tarantula Nebula, also called the True Lovers' Knot (NGC2070). This nebula is intriguing because it is the only extragalactic nebula visible to the naked eye.
The Large Magellanic Cloud
The Tarantula Nebula, NGC2070
(Photos copyright of: Anglo-Australian Telescope Board;
Taken by the UK Schmidt Telescope, David Malin.)