Star Wars Episode 0: The Requel
Dac, the only habitable planet in orbit around the Outer Rim star Dacca, is the homeworld of the Mon Calamari, as well as multiple other sentient amphibious and aquatic species like the Quarren. Quarren and Mon Calamari have a long history of conflict over control of Dac’s oceans.
After first contact with galactic civilization, the Mon Calamari fell in love with space exploration. Working with the Quarrens (who are much more economically-minded) they located massive deposits of valuable materials on Dac’s submerged surface. It wasn’t long before the Dac Shipyards were the envy of the galaxy.