Giant gar
From Ardrana
A more aggressive version of the normal gar, the giant gar inhabits deep fresh water lakes and rivers. The gar's long, streamlined body is covered with hard, overlapping scales and its alligator-like mouth contains needle-sharp teeth.
Note: The giant gar originally appeared in this form in the Monstrous Compendium Volume Two for the AD&D game from TSR. Its use here is for the purposes of providing context for the campaign only.