Zooplankton are the base of many marine and freshwater food webs and play a critical role in the carbon cycle.  Biological oceanographic data were collected during a SEA cruise from the North Atlantic and Northeastern Caribbean Sea around Puerto Rico. Zooplankton were collected by neuston and meter net tows at eleven varying locations and manually categorized to determine diversity. Diversity decreased with depth, and patterns of diel migrations in both zooplankton and phytoplankton were observed.