Mysterious Jellyfish Invade Walden Pond

CONCORD — The sudden appearance of freshwater jellyfish at historic Walden Pond has researchers at the New England Aquarium puzzled.

Scientists say the species, that probably came to the U.S. from Asia about a century ago, are spotted sporadically in ponds and lakes, but rarely in the numbers seen recently at Walden.

Researchers first got word of the jellyfish from a woman who swims at Walden regularly. She had never seen them in 15 years of swimming.

The jellyfish pose little or no threat to humans. Aquarium curator of fishes Steve Bailey tells The Boston Globe the jellies are “wickedly cool” critters.

The pond is famous for Henry David Thoreau’s 1854 work “Walden,” a social critique and commentary on nature that he wrote after living in solitude near the pond.

WBUR Topics · Boston · Environment
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  • melissa webster

    We saw them on most of our swims during September, and on our last swim Oct. 1. Definitely cool!

  • chris

    this is a very scary event.. they are a great danger to the native animals in the lakes and to the water . this is a event that should be looked into with great consern is a sign of the danger nature is in

  • Gsinger

    The jellyfish reappeared this year again in September in as great numbers as in 2010.  I have been swimming in Walden for 30 years and had never previously seen them.  Has something changed?

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