Invasive species are plants, animals or other organisms that are non-native to a given ecosystem and whose introduction causes economic or environmental harm or harm to human health. Invasive aquatic and riparian species like northern pike, smallmouth bass, quagga mussels, tamarisk or Russian olive in Colorado streams and rivers presents management challenges to landowners, conservation groups, resource agencies, and other stakeholders. The dense growth patterns of invasive plants displace native plant species along rivers and streams, reducing plant and wildlife diversity, blocking river access for recreation and agriculture, channelizing waterways, and increasing the frequency and severity of wildfires. Aquatic fish species classified as pests regularly outcompete native species and sport fish alike, changing recreational angling opportunities.

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