Non-native aquatic species-plants,quagga and zebra mussels-are invading California’s Sacramento-San Joaquin Delta and reservoirs and lakes. These pests can increase dramatically under the right conditions, displacing native species, clogging waterways and creating hazardous conditions for navigation and recreation. Once introduced, they are nearly impossible to eraticate. Egeria densa, water hyacinth, and quagga and zebra mussels are some of the nuisance species that can be accidentally transported by recreational boaters when caught in propellers or intakes or attached to hulls. Controlling these aquatic invasive species is a multi-million dollar problem in California.

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