Año 2004, Número 16: 43-50

Año 2004, Número 16: 43-50

Fransozo, A.; Costa, R.C.; Castilho, A.l.; Mantelatto, F.l. 2004. Ecological distribution of the shrimp “Camarão Serrinha” Artemesia longinaris (Decapoda, Penaeidae) in Fortaleza Bay, Ubatuba, Brazil, in relation to abiotic factors.
Rev. Invest. Desarr. Pesq., 16: 43-50. Ver texto completo

The aim of this study is to analyze the spatial and temporal distribution of the shrimp Artemesia longinaris in Fortaleza Bay, northern coast of São Paulo State, Brazil, in relation to abiotic factors. Shrimp samples were obtained on a monthly basis from November 1988 through October 1989 at seven pre-delimited transects on board of a fishing vessel supplied with double otter trawl nets. Depth was recorded at the midpoint of each transect; water and sediment samples were taken to measure salinity, temperature, texture and organic matter content of sediment. The shrimps obtained in the trawls were sorted, identified and 100 g subsample at each transect was separated for measurements (carapace length). A total of 3,083 individuals were obtained. Shrimps were more abundant from November through February (62% of all individuals captured) and from June through August (37%). Regarding their spatial distribution, the largest number of individuals was captured in deeper areas with higher salinity (transects I and VII – mouth of the Bay). No shrimps were obtained at transects II and V (sediment with very coarse sand and shallow waters). The presence of the South Atlantic Continental Waters (temperature < 20 °C and salinity < 36 ‰) at the end of spring and during summer and the decrease of water temperature in winter seem to favour the presence of A. longinaris in the study area. The absence of the speciesin the inshore areas of the Bay was related to the low salinity of the habitat.