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World's Worst Invasives

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More than half a dozen of the 100 of the World's Worst Invasive Species are present in Nova Scotia.

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    Aquatic Invasive Alien Species

    Currently, there is no single “go-to” list of aquatic invasive alien species in Nova Scotia. ISANS is working with experts to develop lists of ecologically important invasive alien aquatic organisms. In the meantime, please click on a species to learn more about these known Nova Scotia invaders. Links lead to a variety of resources: some Nova Scotian, and some Canadian.

    Spinycheek crayfish (Orconectes limosus)

    Flowering rush (Butomus umbellatus)

    European_Green_Crab
    L. Sanchez @ en.wikipedia

    Green crab
    (
    Carcinus maenus)

    Smallmouth Bass
    Wikipedia

    Smallmouth bass
    (
    Micropterus dolomieui)

    Yellow_Floating_Heart
    Mark Elderkin

    Yellow floating heart
    (Nymphoides peltata)

    Tunicates
    A.Redden, ACER

    Sea squirts or tunicates
    (Ciona intestinalis, Didemnum sp., and Styela clava)


    Dead_Mans_Fingers
    Wikipedia

    Dead man’s fingers or oyster thief
    Codium fragile)