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O padrão diário de atividade de Litopenaeus vannamei (Boone, 1931) (Crustacea, Decapoda, Penaeidae) é ainda pouco entendido. Com o objetivo de fornecer subsídios para otimizar o manejo nas fazendas de cultivo através do estudo do comportamento deste animal, foram desenvolvidos experimentos com juvenis (7,57 ± 1,01 g), mantidos em aquários (30 l). Para registro da atividade, os aquários foram submetidos a fotoperíodo artificial (fase do claro e do escuro, 12h:12 h), sendo monitorados 16 camarões (33 m²) em cada fase, durante 20 dias, em janelas de 15 min a cada hora. A alimentação foi fornecida em horários aleatórios, sendo registrados os deslocamentos horizontal e vertical (focal contínuo) e os comportamentos de natação e exploração (focal instantâneo). Os deslocamentos horizontal e vertical dos camarões foram mais acentuados na fase escura, predominando o comportamento de natação. A exploração do substrato ocorreu em ambas fases, acentuando-se entre cinco e sete horas após o acendimento das luzes. Litopenaeus vannamei (Boone, 1931) daily behavior pattern is still poorly understood. With the aim of optimizing the management of shrimp farms through the study of this animal behavior, experiments were performed with juvenile (7.57 ± 1.01), which were marked and kept in aquariums (30 l). To record activity, the aquariums were submitted to an artificial photoperiod (light and dark phases, 12h:12 h), with 16 shrimp (33 m²) monitored in each phase for 20 days, for 15-minute periods every hour. Food was provided at random times and a record kept of horizontal and vertical displacement (continuous focal), swimming and exploration behavior (instantaneous focal). The horizontal and vertical displacements of the shrimp were greater during the dark phase, with a predominance of the swimming behavior. Exploration of the substrate occurred in both phases, with a peak between five and seven hours after the lights were turned on

Padrão de deslocamento do camarão marinho Litopenaeus vannamei (Boone) (Crustacea, Decapoda, Penaeidae) nas fases clara e escura ao longo de 24 horas