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  • Aquatic Invasions! A Menace to the West : Crayfish Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    Crayfish are one of the most threatened groups of animals in the world. About 45 percent of North American crayfish species are considered to be at risk of extinction. However, a few crayfish species are among the world's most invasive freshwater organisms. Taking into consideration that invasive crayfish are the...
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    Crayfish Species in the news Resources Aquatic Invasions! A

  • Aquatic Invasions! A Menace to the West : American Bullfrog Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    The American Bullfrogs are a highly reproductive aquatic species that are native in central, eastern United States and Southeastern Canada. This species was first introduced to western America as a food source (frog legs!); since then it escaped aquaculture ponds and have spread widely. Bullfrogs lay up to 20,000 eggs...
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    Oregon, Washington, and California. Since the early 1900s, they have been introduced and spread to

  • Aquatic Invasions! A Menace to the West : Nutria Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    The nutria is a large, semi-aquatic rodent native to South America. Nutria were introduced to the United States for their fur. After a boom in nutria ranches during the 1930s, the animals escaped or were released from fur farms in the Pacific Northwest, Louisiana and other states, where theyare now...
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    . In the state of Washington, the nutria is classified as a Prohibited Aquatic Animal Species (WAC 220

  • Aquatic Invasions! A Menace to the West : Asian Carps Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    Asian carps—fish in the Cyprinid family—have been part of our culture for centuries. We use them as ornamental aquarium fish (goldfish and koi) and food fish, and to help keep aquaculture ponds clean. However, when Asian carps escape into natural waterways, they can cause big problems for human health, the...
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    imported to control aquatic vegetation in ponds; silver and bighead carps were introduced to control

  • Aquatic Invasions! A Menace to the West : Knotweed Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    Knotweeds are a group of closely related invasive plants from Asia. Knotweeds are very tall plants that can grow to over three meters with bamboo-like hollow stems and heart-shaped or lance-shaped leaves. They spread quickly and form tall, dense thickets. They dominate stream banks, sides of roads, gardens, and other...
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    ; Washington: 1 877 9 INFEST or www.invasivespecies.wa.gov/report.shtml; California: 1 866 440 9530 or

  • Aquatic Invasions! A Menace to the West : Colonial Tunicates Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    What ancient animal in modern times has a primitave spinal cord that may resemble the first vertebrates on earth, spends most of its life stuck to a boat or rock, produces an exoskeleton made of cellulose and is more associated with plants than animals? Tunicates are marine invertebrate filter feeders...
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    harmful to the harbors or bays that the organism is introduced to. Another major vector of introduction

  • Aquatic Invasions! A Menace to the West : Caulerpa Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    Caulerpa taxifolia is a type of invasive seaweed that can thrive in temperate waters.
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    Learning extensions Resources Aquatic Invasions! A Menace to the West • SPECIES GUIDE 1 SPECIES

  • Aquatic Invasions! A Menace to the West : Hydrilla and Brazilian Elodea Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    Hydrilla and Brazilian elodea are invasive aquatic plants that occupy freshwater habitats. While hydrilla is native to Asia, Africa, and eastern Australia, and Brazilian elodea is native to South America, both plants are invasive to North America. Because these plants are related and both have pointed green leaves that whorl...
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    Vallis­ neria americana as influenced by soil fertility. Aquatic Botany 62:225–233. Washington

  • Aquatic Invasions! A Menace to the West : New Zealand Mudsnail Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    New Zealand mudsnails are a highly invasive species of freshwater mollusk of the family Hydrobiidae, also known as spring snails. Their ability to clone themselves and maintain high reproductive rates allows them to rapidly spread throughout the western United States. Some estimates indicate that one female can clone and produce...
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    dissection. SPREADS Once introduced, New Zealand mudsnails can spread quickly as an aquatic hitchhiker

  • Aquatic Invasions! A Menace to the West : Chinese Mitten Crabs Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    The Chinese mitten crab was first identified in the south San Francisco Bay in 1992 by commercial shrimp trawlers, and quickly spread to the Sacramento and San Joaquin Rivers. The Chinese mitten crab threatens ecosystems, earthen structures, and fisheries by preying on and competing with many species, including fish eggs,...
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    - nese_mitten_crab.asp. Washington Department of Fish and Wildlife Con- servation. 2014. Aquatic Invasive Species