[NatureNS] "Crayfish Causing Problems" in C.B.'s Freshwater Lake

Date: Fri, 31 Aug 2007 20:08:31 -0300
From: Dusan Soudek <soudekd@ns.sympatico.ca>
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CRAYFISH CAUSING PROBLEMS (The Chronicle Her.ld, August 30, 2007)

By LAURA FRASER Cape Breton Bureau

INGONISH -- An exotic species has penetrated the depths of Freshwater 
Lake in Cape Breton Highlands National Park, and staff say it may harm 
native plant and animal populations.

The spiny-cheeked crayfish was found in the park in 2005.

The first one may have arrived on a contaminated fishing vessel.

Crayfish are foreign to Bluenose waters, but fishermen from other areas 
might have unknowingly brought in the eggs, said Jonah Mitchell, manager 
of resource conservation at the park.

Freshwater mussels, snails and trout could be vulnerable to the 
increased competition for food and shelter, Mr. Mitchell said.

About 45 crayfish were trapped last summer to reduce their population, 
but their numbers have only kept climbing. Parks Canada staff trapped 
more than 500 of the spiny critters in July.

"They're pretty voracious," Mr. Mitchell said.


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<font class="Content_Headlines-links">CRAYFISH CAUSING PROBLEMS (The
Chronicle Her.ld, August 30, 2007)</font><br>
<br>
By LAURA FRASER Cape Breton Bureau <font class="Content_body-links">
<p>INGONISH
&#8212; An exotic species has penetrated the depths of Freshwater Lake in
Cape Breton Highlands National Park, and staff say it may harm native
plant and animal populations. </p>
<p>The spiny-cheeked crayfish was found in the park in 2005. </p>
<p>The first one may have arrived on a contaminated fishing vessel. </p>
<p>Crayfish are foreign to Bluenose waters, but fishermen from other
areas might have unknowingly brought in the eggs, said Jonah Mitchell,
manager of resource conservation at the park. </p>
<p>Freshwater mussels, snails and trout could be vulnerable to the
increased competition for food and shelter, Mr. Mitchell said. </p>
<p>About 45 crayfish were trapped last summer to reduce their
population, but their numbers have only kept climbing. Parks Canada
staff trapped more than 500 of the spiny critters in July. </p>
<p>"They&#8217;re pretty voracious," Mr. Mitchell said. </p>
</font>
</body>
</html>

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