Quali-quantitative analysis of sea-bob-shrimp's ichthyofauna bycatch, at Armação do Itapocoroy, Penha, Santa Catarina

Abstract

The ichthyofauna bycatch in sea-bob-shrimp's fishery was monthly studied from August 1996 to July 2003, in the artisanal fishing grounds at Armação do Itapocoroy, Penha. It had been used two net-of-drag with doors, mesh of 3.0 cm in the sleeve and body and of 2.0 cm in the sacker, pushed for whaleboat with average speed of 2.0 km/h. Mean values of bottom water temperature and salinity remained uniform in a seasonal fluctuation, showing no significant differences among the studied years. A total of 60 species were collected, in which 22 were considered common species along the sampled period. Sciaenidae, Carangidae and Clupeidae families presented the highest number of specimens, accounting to 92% of catches, being Stellifer spp., Paralonchurus brasiliensis and Isopisthus parvipinnis, the dominant species, occurring regularly along the years. Seasonal fluctuations were observed in the abundance and diversity of ichthyofauna, with significant differences observed among the sampled years and biomass, as well as numerical abundance. The monitoring of trawling fishery targeting sea-bob-shrimp may contribute in a way to maintain the exploited stocks and guarantee the subsistence of traditional communities along Santa Catarina's coast.