A significant portion of the captured fauna in sea-bob-shrimp fisheries is composed by fish, which are non-commercial species or non-commercial size, thus being generally returned (dead) back to sea. Our samples were obtained monthly on board of artisanal fleet vessels that operated along the area of Penha, SC, Brazil, from August/2001 to July/2002. A total of 6719 fishes were captured, distributed in 22 families where 37 fish species were identified. The ichthyofauna presented seasonal oscillations in number of specimens, as well as, CPUE. Richness and diversity indexes resulted in similar patterns of variation and equitability values revealed an uniform distribution of species in sampled areas.