Overview
- Scientists and monitoring programs report a clear uptick in juvenile white shark sightings off California this summer, with a UC Santa Barbara drone project recording about a twofold increase.
- Experts warn warmer water is already bringing tropical arrivals such as mahi mahi, tuna and sea turtles and could include venomous yellow-bellied sea snakes that pose acute medical risks if handled.
- El Niño reduces coastal upwelling that normally brings cold, nutrient-rich water, which shrinks prey supplies and pushes sharks, rays and other species to chase food into new areas.
- Researchers expect more brown stingrays and a likely rise in stingray injuries to beachgoers even though the California Department of Fish and Wildlife notes shark–human interactions remain historically very rare.
- Past strong El Niños produced similar northward shifts in 2015–16, scientists call the current pattern a 'double whammy' that may prolong impacts into fall and winter and will be clearer by October.