EnglishThe temporal and spatial variability of demersal fish assemblage in a sea-bob-shrimp fishing area at the coast of northern Santa Catarina was examined over a sampling period of one year. Monthly samplings were conducted by bottom trawl tows during day and night hours in nine stations between October 2003 and September 2004. 8,967 specimens of 72 species representing 31 families were captured. Larimus breviceps, Stellifer rastrifer, Stellifer brasiliensis, Paralonchurus brasiliensis, Menticirrhusamericanus and Isopisthus parvipinnis were predominant among the fish caught. The average number of species and individuals varied significantly over time and space. A smaller number of fish and species seem to occupy the area in the spring. There was a negative gradient in terms of abundance and species diversity between inner and outer areas. The time of the year and of the day significantly affected the use of the area by the fish, but no significant effects of depth on the fish assemblage were found. This monitoring has contributed to the expansion of knowledge and conservation of fish fauna in the area studied. portuguesDurante um ano foi estudada a variabilidade temporal e espacial da assembleia de peixes demersais em uma area de pesca de camarao sete-barbas situada na costa norte de Santa Catarina. Entre outubro de 2003 e setembro de 2004, mensalmente foram realizados arrastos de fundo durante o dia e a noite em nove estacoes de coleta. Foram capturados 8.967 exemplares de 72 especies e 31 familias, com predominio numerico de Larimus breviceps, Stellifer rastrifer, Stellifer brasiliensis, Paralonchurus brasiliensis, Menticirrhus americanus e Isopisthus parvipinnis. Diferencas significativas no numero de especies e individuos foram observadas, com um menor numero na primavera e nas areas mais rasas. A assembleia de peixes variou com a estacao do ano e o periodo do dia, mas nao com a profundidade. Esse monitoramento contribuiu para a ampliacao do conhecimento e conservacao da ictiofauna na area de estudo.