In 2003, an unexpected stowaway on a container ship found its way into the Port of Long Beach and was introduced into our nearshore ocean. If you have been strolling on the beach or have been diving along the rocky reefs in Southern California, you may have seen it. It is a brown algae called Sargassum horneri and it has spread as far north as Santa Barbara and south into Baja, Mexico. Originating in the warm waters of Japan and Korea, this invasive alga’s distribution and persistence along the West Coast has generated concern as it poses a potential threat to native ecosystems.
Read more from Los Angeles Waterkeeper.