please keep us updated as the fish continues to grow...it's often difficult to tell for sure at this size, but i would lean towards longnose as well. at the same time, the snout doesn't seem obviously longnose quite yet, and at this size there is a chance it could be a shortnose.
i'm not sure how the seasonal availability of gars works where you are in the philipines, but both small longnoses and shortnoses are currently in season here in the US, so that adds to the questionability.
also compare to photos of a young shortnose i had several years ago:
snout and patterning are similar...again, i think it will become much more obvious what the fish is as it puts on another few inches (richard and i always have fun with this stuff

) --
--solomon