Sea Snagret

The Sea Snagret is a fully aquatic snavian species, and the final boss of the Saltwater Swamp in Pikmin Z. The appearance resembles a typical Burrowing Snagret, with blue scales running along its body and a bird-like head, yet with a fin on the end of its tail resembling a shark's tail, and black rings running down its body. It only comes out after the gate to its arena is opened.

Biology
The Sea Snagret has evolved to suit life in the sea. As the parent to the Dwarf Sea Snagret, it can call upon its young to fight alongside it. It swims around the arena, occasionally swimming in to snatch Pikmin with its beak and eat them. Pikmin can only attack its head, as throwing them at the body will just bounce off.
 * Diet: aquatic animals
 * Predators: unknown

Piklopedia entry

 * "This is probably a rather late evolution, as it is the first snagret to date that has evolved into a sea-going hunter. It behaves more like a fish than a snagret and it roams around its territory along with its children to attack and slay prey with its sharp beak."

Strategy
In order to attack the Sea Snagret, it must be coaxed into charging into a wall, causing its beak to become stuck and opening it up to attack. The boss has the ability to summon its young to aid it in battle. At half-health, the Sea Snagret will occasionally generate a whirlpool, which it generates by spinning rapidly and zooming by. Any Pikmin caught in the whirlpool will be vulnerable to either the Sea Snagret or the Dwarf Sea Snagret. Continue this method until the Sea Snagret falls.