Lake Bernard    
Lake Bernard Lake Bernard Lake Bernard


Invasive Species

Invading species are one of the greatest threats to biodiversity… Originating from other regions of the world, and in the absence of their natural predators or controls, invading species can have devastating effects on native species, habitats and ecosystems.
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Invading species arrive in a landscape as an unforeseen consequence of other activities, or because people aren’t careful about their actions. A boat moving from one watershed to another may contain seeds, cuttings or creatures that are alien. A person may introduce a species on purpose without understanding the consequences of their actions (this is sometimes called bucket biology). Some invading species find a small niche and fit in, while many others cause havoc.


Individual actions with collective impacts:

  • Clean your boats before putting them in the water
  • NEVER introduce a bucket of bait or a species you’ve not seen naturally in the lake. Think of rabbits in Australia.
  • If it’s invasive and taking over, think of other uses for it – humans make excellent predators. We’ve included recipes for rusty crawfish. Milfoil makes an excellent compost, and we’ll try it in salad.

Rusty Crawfish

Issue: The rusty crawfish is a new species to come to Lake Bernard. Larger, more aggressive and a more effective breeder, the rusty sided crawfish will impact our local crustaceans by eating them and taking over their habitats.
rusty crawfish

How to Identify Rusty Crayfish

  • Rusty crayfish are large; adults can reach 7.5 to 13 centimetres rostrum (part of shell in front of eyes) to tail.
  • Rusty patches on each side of the shell.
  • Grayish-green to reddish-brown claws with black bands near the tips.
  • Claws have an oval gap when closed.
  • The rostrum, is smooth, pinched and distinctly concave.

The solution: trap them and eat them.

Here is a short video showing how to prepare crawfish tails.

Here’s the inspiration:

Other species can be eaten too. Beaver is delicious, brined and slow roasted over a fire. We invite people to send in recipes – milfoil salad, or dried and salted as a snack?

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