Quebec fishermen catch invasive grass carp in St. Lawrence River

Twofishermen in Quebec'sLanaudire region have caught an invasive grass carp, raising concerns about the presence of the invasive fish in the St. Lawrence River.

Pierre Thriault and Gerald Boucher, commercial fisherman from Lanoraie,northeast of Montreal, reeled in the 29-kilogram specimenon May 27.

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"We really weren't sure what it was. It looked like a carp It had the same colour, but it was huge! We could see it was different from the others," said Thriault.

Not long after contacting biologists from Quebec's Forests, Wildlife and Parks Ministry, it was confirmed that the fishermen's catch was a one-metre-long female grass carp, one of four Asian carp species.

"For biologists, it's been a big surprise. It's as if they didn't want to see it here," saidBoucher.

Thefish is native to east Asia and has been used in North America for consumption and management of aquatic vegetation.

Some varieties ofAsian carp, such as the silver andbighead,reproduce quickly and can eat up to 20 per cent of theirbody weight in plankton each day.

The grass carp, by comparison,eats primarily aquaticvegetation, often uprooting large areas of vegetation which can deplete other native populations. Some biologists believe they are less of a threat to the ecosystem compared to other types.

This specimenwas probably between 15 and 30 years old, according to biologist Michel Legault.According to preliminary analysis, the fish's belly was full of sterileeggs.

"We actually thought the Asian carp was confined," said Legault."But we know that in recent years the grass carp has been found in a small section of Lake Erie. And last summer, nine grass carp were caught in the Toronto area."

"This is not good news, in principle."

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The discovery has forced Quebec's Forests, Wildlife and Parks Ministry to immediately roll out its plan to fightthe invasive species, which will be headed by Legault.

The ministry will spend$1.7 million over three years to try and detect the Asian carp in the river and educate commercial fishermen.