Pangasius polyuronodon or juaro fish is freshwater fish that inhabit the Siak River. To understand the morphometrical, meristical characteristics and growth pattern of this fish, a research had been conducted from May-July 2017. There were 100 fishes (200-73.57 mm SL and 103.0-5.5 gr BW) were captured from the Siak River. There were 28 characteristics measured and 5 meristical characteristics c…