The Xindi-Aquatic scout ship was a Xindi-Aquatic starship used in the 2150s. It was much faster and more maneuverable then the Aquatics' main cruiser.
The Aquatics sent several vessels of this type among their fleet to assist the United Earth starship Enterprise in their fight against the Reptilians and Insectoids to destroy the Xindi superweapon before it could attack Earth. At least one scout ship was destroyed by Dolim's warship during the subsequent battle, and at least two others were disabled by spatial anomalies created by the Sphere Builders. (ENT: "Azati Prime", "Countdown")