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Non-Native Invasive Fish and their Impacts
BIO-309
Hosted by Northwest Environmental Training Center

In this course, attendees will explore efforts to understand and combat invasive fishes through early detection and assessment of newly established invaders, monitoring of invading populations; improving understanding of the ecology of invaders, and factors in the resistance of habitats to invasion. Development and testing of prevention, management, and control methods will also be reviewed.

Invasive species threaten the biodiversity of aquatic ecosystems worldwide and are considered the second greatest threat to biodiversity loss in North America. Exotic species introductions (illegal and intentional) were a factor in 68% of fish extinctions in North America, and the rates of introductions have increased dramatically in the last 50 years, impacting nearly every major watershed in the United States. Predation, competition for food and habitat, food web alterations, interbreeding, disease and transmission of parasites are some of the major problems with non-native fish species. Habitat loss and degradation, climate change and urbanization have also contributed to the establishment and spread of non-native fish.

Fisheries management programs have transplanted popular sportfish, such as northern pike brown trout, brook trout, rainbow trout and lake trout to provide recreational opportunities, and many other aquatic organisms have been planted to enhance fish growth. Additionally, international commerce has facilitated the movement of species via ballast water in ships, aquarium releases, and illegal translocations.

Regardless of the cause of species introductions, the establishment and proliferation of invasive species often results in the decline and potential extinction of native species, with invasive predators having the most dramatic effects.

After attending, participants will have a greater understanding of what constitutes a non-native species, when they become a problem, and how to respond to potential threats by invasive species.

AICP members can earn Certification Maintenance (CM) credits (pending) for this activity [or many activities at this event]. 7 CM credits are available for this course. More information about AICP's CM program can be found at www.planning.org/cm.
 

For general information contact Tracy Clark by telephone at (425)270-327 or via e-mail at tclark@nwetc.org

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