The research was conducted from February to March 2008 at Baru Lake in Mentulik Village, Kampar Kiri Hilir Sub-regency, Kampar, Riau Province. This research aims to understand the distribution of the zooplankton vertically. Methods used in this research is a case-study method. Zooplankton sample were collected from 4 stations. It were taken by using a water pump and then sieved by a plankton ne…