Sampling sites are located along the coast of the isle of Tenerife in the north (Punta del Hidalgo),
in the north-east (Santa Cruz de Tenerife commercial harbour and its fishery dock dependency),in the east (El Socorro), in the south (La Tejita) and in the west (Alcalá; Fig. 1). Santa Cruz de Tenerife commercial harbour and its fishery dock dependency are evident polluted locations on a global considering, being the rest of locations of non-risk potential but Punta del Hidalgo, which presents crude oil spills and agricultural and urban pours frequently.