Figure \ref{163888} depicts the surface salinity and temperature distribution during the days of the survey, which represents an approximate 6-day average. It exhibited salty and warm values all along the coast, particularly between Lerma and Isla Piedra which are located on the shallowest depths (<5 m) at the NE of the study region. At the northwestern edge of the sampling region (off  Isla Arena),  upwelled waters coming from the Yucatan coast entered the study area bringing "cold" temperatures and mild salinities (27 °C and 37.2 g/Kg, respectively). Off Terminos lagoon, located on the south of the study region, flushing waters from this body of water expelled warm (30 °C) and less salty waters and (36.2 g/Kg), thru its southern mouth (Boca del Zacatal) to the adjacent ocean.