The OZ-09MMS Pisces was considered a state-of-the-art amphibious mobile suit when it was introduced into service by OZ in the early AC 190s. Unlike the Cancer, however, the Pisces was a truly transformable mobile suit, changing from a submarine form into a "complete" mobile suit with legs, allowing it to stand on the ocean floor or even walk ashore for amphibious assaults. Its main drive propellers turned into "fingers" for the Pisces' "hands" when in mobile suit mode, although they limited in their ability to handle and manipulate objects. The Pisces mounted a half-dozen torpedo launchers in each shoulder, giving it more firepower than the Cancer.

Source: Gundamproject.com, New Mobile Report Gundam Wing