The species Sargassum muticum, Sargassum filicinum, Grateloupia turuturu and Grateloupia lanceolata, grow on different substrates in the Port, and because they grow abundantly, tend to displace native species and are therefore considered biological contamination. This work includes a review of the introduced macroalgae to the Port of Ensenada, their current distribution in Mexico and discusses its probable origin and possible vectors of introduction.