Plankton are organisms whose displacement power is insufficient to overcome the dynamics of water bodies. Ecologyhighlight the zooplankton which has a key position in the trophic webs, as they feed on phytoplankton, functioning as an energy transfer link. Identifying the seasonal composition of these communities can bring new data that increase the management and conservation plans in the region. So far, twocollections have been madein the State Marine Park of “Laje de Santos”(PEMLS): the first in the winter of 2019 and the second in the summer of 2020, in the adjacent waters of the PEMLS, another twoseasonal collections are expected. The method of collection was the superficial horizontal trawl, using conical plankton net. The objective was to identify the groups belonging to the zooplankton in this region and to treat this data by applying synthetic diversity descriptors and making the results available in an electronic guide. As preliminary results, 35 taxa were identified, with greater abundance of the Copepoda group as expected, followed by Cladocera and Chaetognatha, as well as a the greater abundance of individuals occurred in the summerperiod. Keywords: Laje de Santos; Zooplankton; Plancton guide