Zooplankton form the foundation of the ocean's biosphere as important prey for secondary consumers. To assess the density of zooplankton populations, Neuston net tows were deployed throughout the S.Atlantic and N.Caribbean. A higher density of zooplankton was recorded during night tows as opposed to day tows, supporting the theory that zooplankton undergo DVM as a survival strategy, opening the door to future research concerning the effects of factors such as moon phase on migration patterns.