Logs of Oak (Quercus castanifolia) and Elm (Zelkova carpinifolia) have been cut to lumbers with dimensions of 300×100×30 mm. The oven dried samples have been impregnated with CCA (Chrome–Cupper-Arsenic). Treated and untreated (natural as a control) woods have been established for 3, 6, 9 and 12 months in Amirabad beach of Behshare under fishing environment. The observation results shows that in this beach, the staining fungi and balanus are able to attack control woods or live on them. With increasing wood maintaining in the sea, the presence of organisms becomes longer. The numerical results shows that weight losses of elm control samples drop to less than 5% after one year. However, control samples of oak have no weight losses in the same time of exposure. The treated samples not only have no weight reduction, but the absorbed salts make their weight increase. Low salinity level of Caspian Sea with respect to salinity of large sea (oceans), vanishes the wood drilling worms in Caspian Sea and this may be the main reason for the non-destruction of wood samples.

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