Invasive Species

Invasive, alien and exotic species include all introduced non-native species occurring in wild spaces. The Great Lakes and St. Lawrence River basin ecosystem is home to more than 160 known non-indigenous species of fish, invertebrates, plants, parasites, algae and pathogens. Introducing non-native species to a natural environment can cause widespread and sometimes unpredictable changes to habitats and is a worldwide problem. Ecological changes can result in damage to ecosystems, native fish and wildlife populations, damage to local infrastructure, disruption of commerce, and even threaten human health due to poorer water quality conditions and loss of biological diversity.

While zebra mussels were found in Crow Lake in 2004, they were determined to be absent when testing was done in 2005.  No zebra mussels have been found in Bobs Lake; this is believed to be due to the high calcium count in Bobs and Crow Lakes which inhibits the growth of zebra mussels.

Invasive species in Bobs and Crow Lakes, plus those found in the Rideau System, are listed below. This is an indicative list rather than an exhaustive one.

Found in Bobs and Crow Lakes

  • Gypsy Moth
  • European Milfoil
  • Purple Loosestrife

Found in the Rideau System

  • Rusty Cray Fish
  • Several Aquarium Snails (Mud Bithynia, Banded Mystery and Chinese Mystery)
  • Red-eared Slider Turtle
  • Common Carp (burrows into shoreline mud, uproots vegetation & usurps other native aquatic species from their habitat)
  • Round Goby
  • European Frogbit
  • Eastern Mosquito Fern
  • Curly pondweed
  • Flowering Rush

Land Based Plants

  • dog strangling vine
  • lilac
  • goutweed


Because we are connected to the Rideau Canal System, there is a potential threat from those species already found there. The Rideau System is particularly prone to infestation because of high volume boat traffic from the Great Lakes and Seaway systems.

There is also a large number of land based invasive flora, which tend to be the result of botanical trade in non-native plants and gardening habits.

The links below are a small sampling only and do not represent by any means an exhaustive list of web sites on the topic of invasive species in Canada.

The above links are provided for the convenience of our web site users. They do not, in any way, constitute an endorsement of the linked pages or any commercial or private issues or products presented there. We cannot make any warranty or representation concerning the content of these sites, or secondary sites from the pages to which they link.

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