The Mudskipper is the first fish you'll get in Dragon Shrine. The fish after is the Butterflyfish.
It drops 23 coins and requires 2 slices, if using a Muramasa katana.
In Ninja Fishing this amphibian has a tail, 2 hands, an Axolotl shaped head, and an Axolotl fin/gill.
In it's real life it has a tail, 2 hands and different animal's head and gill.
Update V1.6.0, 26 May 2013; by Gamenauts.
Copied from Ninja Fishing (Updated) Wiki.