ABSTRACT This research has been held on March-April 2019 in Jago-Jago sea waters of Tapanuli Tengah, North Sumatera. The purpose of this study was to determine the density of species, morphometrics of Enhalus acoroides leaves. The study was also aimed to analyze the effect of sediment particle sizes on density and morphometrics of seagrass leaves. The stations were determined by purposive sa…