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    Home»Science»See How a Parasite Travels from Tiny Crustacean to Fish
    Science

    See How a Parasite Travels from Tiny Crustacean to Fish

    By AdminOctober 12, 2022
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    A tiny bug manipulates the behavior of its hosts to ensure its unlikely life cycle

    Credit: Daisy ChungAdvertisement

    Parasites give new meaning to the cliché “eat or be eaten.” Often their life cycle can be completed only if they are ingested by a host—multiple times for some—making the odds of their survival seemingly minuscule. To improve their chances, certain parasites manipulate their hosts’ behavior to make it more likely the eater will get eaten.

    The parasitic cestode Schistocephalus solidus requires a much larger host—specifically, a three-spined stickleback fish—to grow in and then a bird to breed in. But the parasite’s larvae, less than a millimeter long, are too small to be eaten by the fish.

    Instead a larva must first be ingested by a copepod, a crustacean akin to a tiny shrimp. When ready for its next host, the larva makes the copepod twitch. If all goes well (for the parasite), a three-spined stickleback then eats the copepod. Inside the fish, the larva grows enormously, making the poor stickleback gasp at the water’s surface, where it is likely to get snacked on by a bird. Inside the bird, the parasite matures and mates, sending its eggs back to the water through the bird’s poop. And so the cycle begins again.

    Credit: Daisy Chung

    This article was originally published with the title “An Improbable Life Cycle” in Scientific American 327, 4, 78 (October 2022)

    doi:10.1038/scientificamerican1022-78

    ABOUT THE AUTHOR(S)

    Madhusree Mukerjee is Scientific American‘s senior editor for science and society. Credit: Nick Higgins

    Recent Articles by Madhusree Mukerjee

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