California coast sees influx of tropical species due to El Niño

An unusually strong El Niño phenomenon is driving tropical marine species to the California coast, creating a unique ecological shift. Warm ocean waters moving north have led to sightings of species rarely seen in the region, including longfin bigeye fish, manta rays, flying fish, and whale sharks. For the first time, sea turtles have been recorded nesting on California beaches, and olive ridley sea turtle nests were identified in Orange County.

The phenomenon has also brought risks, including the appearance of a venomous yellow-bellied sea snake on a Southern California beach. While the influx of warm water has provided a ‘golden age’ for local recreational fishing—with reports of massive increases in yellowfin tuna, wahoo, and mahi-mahi catches—it has also caused environmental disruption.

Combined with a marine heatwave and Pacific hurricanes, El Niño has contributed to rising sea levels and large waves that have caused coastal erosion and property damage, prompting California to declare a state of emergency. Scientists warn that while mobile species like sharks can adapt, stationary ecosystems such as kelp forests face significant threats due to the warming waters.