Lebtin Javelin Fish

The Lebtin javelin fish is an aquatic creature in the Animorph Series.

Physiology
A vast, bright yellow stingray, that is mostly flat and oblong with two stalk-mounted eyes and two trailing antennae on its underside. There are a row of about twenty spears along the top of its wings, that are used to fire at predators or prey. These spears are as long and as thick as a broom with irregular striping of yellow and green, and blue. The creature shoots the spears from its mouth by first rolling a spear into a flap and then swelling up with water, like a pufferfish, and then ejecting the water out to create momentum for the spear.

Source

 * Animorphs #12: The Reaction.