Hook-Beak River Gilltail
When the mining beakworm and krystal snoutsuckling went extinct, the crystal gilltail population exploded. Now, facing overpopulation, some of the crystal gilltails adapted to life in the rivers, splitting into a new line. The hook-beak river gilltail evolved contractile vacuoles in their gill cells to push some of the excess water out, maintaining homeostasis. This adaptation means they can survive in and type of water. Their outward appearance has not changed much. They have a blueish coloring to their fins and tail and have a slightly darker coloring. The most drastic change is to their beaks.
The hook-beak river gilltails are omnivores, so they need to catch prey. They are able to take down prey as big as they are by swimming up to them and impaling them with their beaks. They also uses their beaks to break apart plants for them to eat. The males have a horn on the end of their beaks, which they use to defend their territories from rival males during mating season.