California Department of Fish and Wildlife
collage of various invasive species

Invasive Species Program

What does the Invasive Species Program do?

The mission of the Invasive Species Program is to reduce the negative effects of non-native invasive species on the wildlands and waterways of California. We are involved in efforts to prevent the introduction of these species into the state, detect and respond to introductions when they occur, and prevent the spread of invasive species that have become established. Our projects address problems with introduced animals and plants, both terrestrial and aquatic. More fundamentally, we try to identify and address the ways by which the species are introduced, typically inadvertently, by human activities. Studies show that preventing introductions is the most effective and cost-efficient way to manage invasive species. We conduct our work in coordination with other government agencies and non-governmental organizations.

What makes a species “invasive,” how they got here, and why they are a problem.

What's new in the Program?

New Aquatic Invasive Species Identification Poster!

The Invasive Species Program has developed a new outreach poster to aid in the identification of six invasive species that threaten California’s freshwater environments. View the poster (PDF), or look for it on display in a California Department of Fish and Wildlife office or hatchery. Would you like a copy of the poster to display? Contact us at to request one.

1st Annual California Invasive Species Action Week and Youth Poster Contest!

The California Fish and Wildlife Department’s Invasive Species Program is pleased to announce the establishment of the California Invasive Species Action Week, or California ISAW, to be held Saturday, August 2 through Sunday, August 10, 2014. The goal of the Action Week is to not only increase public awareness of invasive species issues, but also promote public participation in the fight against California’s invasive species and their impacts on our natural resources. The Action Week schedule will be filled with invasive species volunteer events and workday opportunities for youth and adults across the state. During the Action Week, we will also announce the winners of the 2014 “Race to Protect Your Favorite Place” Youth Poster Contest! The deadline for poster entries is June 20, so get creative!  Visit our Action Week and Poster Contest pages for information and participation details, or to advertise your Action Week events.

Winter 2014 Eye on Invasives: Delta Invasions

Eye on Invasives is the California Department of Fish and Wildlife's newsletter dedicated to providing the public with new and important information about invasive species in California. This latest issue of Eye on Invasives focuses on invasive species issues in the Sacramento-San Joaquin River Delta. Inside, you will find a Research Spotlight article by Evyan Borgnis and Dr. Katharyn Boyer of the Romberg Tiburon Center for Environmental Studies, San Francisco University, discussing the potential impacts of climate change on native and invasive pondweeds in the Delta. This issue also features a Partner Spotlight article on the Aquatic Weed Control Program implemented by the Boating and Waterways Division of the California Department of Parks and Recreation. Visit the Eye on Invasives page to read the latest issue (PDF),  access past issues, or to subscribe.