The plankton community for the Gulf of Morrosquillo was represented by 34 taxa for zooplankton in 22 taxa Arthropod 1 taxon Chaetognaths, 3 taxa for Annellida, 1 taxon Nemertes, 1 taxon Cnidaria, 1 taxon Mollusca, 5 taxa Chordata and 51 species of Phytoplankton in 29 species of diatoms, 20 dinoflagellates and 2 chlorophycean. The composition and structure of the community are influenced by nutrient inputs from the Sinu river, Cispatá bay and coastal streams.