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Hydromorphological alteration causes numerous, steeply studied, impacts in coastal zone. The general impact of hydromorphological alteration is reduction of complexity, dynamism and biodiversity (Elosegi et al. 2010). Alteration of coastal habitats causes physical changes that impact the biological diversity (Orlando-Bonaca et al. 2011:7). Coastal habitats have been altered in many ways; forms of hydromorphological alteration as dredging, land reclamation and reshaping to artificial substrate are activities that have weakened living conditions for natural habitats (Crain et al. 2009:40). There is evidence, that artificial structures and HYMO-alteration would develop new habitats for invasive species, while some of the original species disappear. As a result, no dramatic changes occur in biodiversity, but significant changes in composition of species are evident.