The Treasure State faces an invasion of jellyfish, Craspedacusta sowerbii, from unknown origins. Montana Fish, Wildlife and Parks (FWP) assure they pose no danger, but they are a non-native species. Tom Woolf from FWP’s Aquatic Invasive Program remarked that while these freshwater jellyfish are not harmful to humans, they aren’t welcome additions to Montana’s ecosystem.
Discovered by 10-year-old Vivi Veitch near Canyon Ferry Reservoir, this sighting was reported to FWP, who confirmed the presence of the jellyfish. Although invasive species can negatively affect state lands and waters, these jellyfish are relatively harmless but now part of the ecosystem. Freshwater jellyfish, originally from China’s Yangtze River, have spread across the U.S. since first recorded in England in 1880. They were last seen in Montana 17 years ago near Great Falls.
These jellyfish are tiny, primarily living as microscopic polyps underwater, going dormant in winter. Their short-lived medusa phase occurs in summer. They consume zooplankton, crucial to aquatic food webs. The means of their arrival in Montana remain unclear, though they could have traveled via boats, potted plants, or scuba gear.
FWP emphasizes “Clean, Drain, Dry” to prevent aquatic hitchhikers like these from spreading. Public vigilance is vital in reporting unusual sightings. Woolf advises, “If you see something strange, report it, so we can verify it.” Early detection of invasive species can lead to successful removal.
Montana mandates boat inspections statewide, including for paddleboards and inflatables, to prevent the spread of species like zebra and quagga mussels. This year, 114,000 inspections were conducted, intercepting 600 weed-carrying boats and detecting zebra or quagga mussels in 31 instances. Zebra and quagga mussels are significant threats, capable of causing algae blooms and system blockages.
Golden mussels, another invasive threat from Asia, are also a concern. Montana Invasive Species Council, marking its 10th anniversary, plays a key role in tackling these issues. The council’s efforts, along with government and public collaboration, are crucial to preserving Montana’s natural and cultural heritage.
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