![Aerial view of a large cargo ship docked at an industrial port along a wide river. The ship has a helipad marked with an "H" and is equipped with several open cargo holds. Cranes and industrial equipment are visible on the dock, with storage tanks, warehouses, and other infrastructure nearby. Surrounding the port area are open fields, warehouses, and a network of roads, with a cityscape extending into the distance under a clear blue sky.](https://i0.wp.com/calmatters.org/wp-content/uploads/2024/11/103121-Stockton-Pollution-FG-CM-42.jpg?resize=400%2C300&ssl=1)
Environment
Unstoppable invasion: How did mussels sneak into California, despite decades of state shipping rules?
Most ships discharging ballast water into California waters are inspected, but state officials have tested the water of only 16 ships. Experts say invaders like mussels are inevitable under current rules and enforcement.