Exotic marine organisms Garveia franciscana, called "polo de oso" by the locals, were detected in Lake Maraeaibo after the lake was opened to the sta in 1959. These organisms adapt and maintain a favorable ecological growth in this environment. "Pelo de oso" constitutes one of the three components of the metal/biota/solution system that interact in
Lake Maracaibo, producing biofouling and promoving microbiological corrosion. The latter generate great economic problems, maily: water-pump failures, increase in cleaning frequency at inlet, decre_asing
efficiecy of deoxygenating towers, increase in facility-maintenance costs due to unscheduled shutdowns, and so on. The main objective of this study is to determine: a) The preference of "Pelo de Oso" for metal or non-metal materials immersed in lake water and b) Electrochemical, Chemical and physical factors that might lead to an understanding of how to control '~Pelo de Oso'" development and growth on equipment
that uses lake water.
Keywords: Biofouling, Microbiological Corrosion, "Pelo de Oso", Metals