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April 2016 Stop Aquatic Invasive Species Freshwater Jellyfish (Craspedacusta sowerbyi) The freshwater jellyfish can live in a variety of freshwater environments such as lakes, rivers and ponds. Their diet consists mostly of zooplankton which they find with the aid of eye spots on the base of their tentacles called nematocysts. The nematocysts are also used to detect light and dark and aid in escaping predation. This invasive species has no head or skeleton and lacks organs for excretion and respiration. The freshwater jellyfish has the potential to alter food chains within the aquatic ecosystems they invade as they can consume large amounts of zooplankton. The freshwater jellyfish is native to the Yangtze River valley of China. In Canada, they have been discovered in Quebec and Ontario. Identification Photo credit: Life in Freshwater.Net and Manitoba Museum · Bell-shaped · Size can range from 5 to 25 millimetres in diameter · Translucent whitish or greenish tinge in colour · Tentacles of varying lengths · Nematocysts are unable to penetrate human skin · 50 to 500 tentacles saskatchewan.ca/tip TIP LINE: 1-800-667-7561 SaskTel Cell: #5555 How would the Freshwater jellyfish get here? Freshwater jellyfish primarily spread to new waters by being transported along with plants or may have been accidentally translocated with stocking of fish. What can I do to prevent the spread of Freshwater jellyfish? Clean, drain and dry your boat and equipment thoroughly before launching into a new area. Remove all visible plants, animals and mud into enclosed garbage cans. Never use invasive species as bait or in your aquarium; always check with the sellers to be sure. Make others aware of this invasive animal and report any findings to the Saskatchewan TIP line. CLEAN + DRAIN + DRY YOUR BOAT Live Wells Anchor Bilge Dock Lines Live Wells Motor Trailer Prop Axle Hull Ballast Tanks Rollers Current Saskatchewan Regulation The Fisheries Regulations prohibit Saskatchewan residents and visitors from importing, possessing, transporting or selling aquatic invasive species. Report Sightings Report any sightings to the nearest Ministry of Environment office or call the TIP line. Need more information or have questions? Call 1-800-567-4224 (in North America) or email [email protected]. saskatchewan.ca/tip TIP LINE: 1-800-667-7561 SaskTel Cell: #5555 For a complete list of prohibited species, click here
