The variety of marine coastal environments of Mexico has been scientifically recognized; allowing the high diversity
of organisms. The floristic richness (macroalgae species) includes giant kelps of cold environments of the Pacific
coast, which are economically and ecologically important. This also includes a wide variety of macroalgae species
from temperate and tropical environments. This ecological diversity is currently threatened and affected by the
impact of climate change and by the non-native species introduction related by increased tourist routes and
commercial navigation to Baja California shores. Based on a monitoring program of introduced macroalgae species,
in the last 15 years several non-native species have been collected in the facilities of the port of Ensenada, Baja
California. 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.