Tag Archives: grass carp

Earth

Lake Erie Fisheries At Risk Or Set For Bolstering From Invading Fish

2 Comments


No perch or pickerel in Lake Erie’s fisheries future? The tasty fish our Great Lakes are known for, and all other sport fish, could be decimated if the insidious Asian carp migrate from the Mississippi watershed.

Combined, the four Asian carp species could decimate the Great Lakes fishery by out competing our native fish.

Plankton, which is the base of the Great Lakes food chain, is consumed by silver and bighead carp. Grass carp prefer plants while black carp eat mollusks. Asian carp can consume up to 20 per cent of their weight every day.

Since escaping impounds near the mouth of the Mississippi River, the carp have spread north and are very near the Great Lakes in the Chicago Sanitary and Ship Canal. So far, everything from electric barriers to water-propulsion jets to noise cannons have been considered to keep them at bay.

BING image search results for “Ontario Invasive Fish Species”.

But, the systems aren’t perfect. A silver carp was caught on June 22, just nine miles from Lake Michigan. Two weeks of intensive monitoring did not find any other carp. The captured fish has been sent for laboratory analysis to search for more clues on how it got there.

While some fear this is the beginning of the end, it should be noted that a bighead carp was also found in the area in 2010. The protocol for stepped-up monitoring wasn’t in place then, but no Asian carp have been found in the area in the ensuing seven years.

 

Most of the media attention rightfully is focused on the Chicago Sanitary and Ship Canal (zoom and scroll on the map above)  as a route for the invasion, but it is not the only possible route. Silver carp have been found in the Ohio River and that state’s Little and Great Miami Rivers – all pathways to Lake Erie. Barriers have improved in Indiana’s Eagle Marsh, where, during flooding, there is a possibility carp could move from the Mississippi watershed to Lake Erie.

Although science and technology continue the search for solutions to the Asian carp threat, politics can get in the way. The Great Lakes states, with the exception of Illinois and Indiana, were in favor of blocking the Chicago Sanitary and Ship Canal. Perhaps the last president hailing from Chicago was a factor in this not happening.

While on holidays in Louisiana, I testified at Army Corps of Engineers hearings for their Great Lakes and Mississippi River Interbasin Study. I support chemical, electrical, vibration and other methods used to deter invasives moving up the Chicago canal.

The U.S. administration has stalled the release of their report, although two weeks ago, the U.S. Senate Appropriations Committee approved a bill that would force its release.  The bill had support from both sides of the House.

Similarly, there has been bi-partisan support to block a move in the presidential budget that would slash the Great Lakes Restoration Initiative funding from $300 million to zero. A portion of that funding goes to Asian carp programs.

On the home front, I have pushed for legislation that Asian carp brought into Ontario for food must first be eviscerated.

Ontario has passed the Invasive Species Act, becoming the first province with legislation dedicated to addressing the threat. Asian carp are included in this law.

Much of the attention and expenditure on Asian carp has been south of the border. In my view, more could be done in Ontario. For the Silo, MPP Toby Barrett.

Featured image- Electrofishing for the invasive Asian carp (Photo By U.S. Fish and Wildlife Service [Public domain]

Supplemental- Is Asian Carp ‘invasion’ actually a secret ‘stocking initiative’ for bolstering commercial fishing?  Published on 13 Aug 2013 Asian Carp Processing Plant- Kentucky -Two Rivers Fisheries in Wickliffe, KY is taking a run at the Asian Carp market. With an abundance of Bighead and Silver carp in nearby waterways, the fish market is set to process and sell these fish for consumption. Commercial fishermen have often said if you pay us for the invasive carp we will catch them and that is exactly what is happening in Western Kentucky.

Earth

Asian Silver Carp Set To Invade Great Lakes

2 Comments

The Great Lakes are one of the world’s most important natural resources – holding one fifth of the world’s fresh surface water, home to more than 150 species of fish, and vital to the economy of Ontario and neighbouring U.S. states. But several kilometres from Lake Michigan lurks a threat that could change the Great Lakes forever. The fish known as Asian carp could wipe out native fish species, devastate sport and commercial fisheries, and cause far-reaching changes to the Great Lakes ecosystem.

If you need proof of the danger to the Great Lakes, take a look at the Mississippi River Basin. After escaping from aquaculture ponds in the southern U.S. in the 1970s and 80s, Asian carp have spread steadily northward. In parts of the Mississippi and other rivers, invasive, voracious Asian carp have crowded out native fish and make up as much as 90 per cent of all fish by weight. Only electric barriers in a canal near Chicago are currently keeping the fish out of Lake Michigan.

The need for a coordinated plan to fight Asian carp led the Ontario Ministry of Natural Resources, with support from the Department of Fisheries and Oceans Canada, to host a “table-top exercise” in March. The exercise simulated an incident where Asian carp get into Ontario waters. The aim was to test if the agencies involved are ready to respond quickly and effectively.

“Preventing Asian carp from spreading into the Great Lakes is the most cost-effective control measure we’ll ever have,” says Ontario Minister of Natural Resources Linda Jeffrey. “This exercise was about making sure all the agencies involved work together, and identifying areas where we’re vulnerable.”

For the March exercise, participants rehearsed how they would respond IF an accident on a bridge over the Thames River in southwestern Ontario caused a truckload of live Asian carp to be dumped in and near the river. It was a timely choice – only a week earlier a fish importer had been fined $50,000 for trying to truck 1,800 kilograms of live Asian carp across the Windsor/ Detroit border to sell in the Greater Toronto Area. It’s illegal to possess live Asian carp in Ontario.

The term “Asian carp” includes four species – bighead, silver, grass and black carp. The bighead and silver carp currently pose the biggest threat. They weigh up to 45 kilograms and can grow to more than a metre long. As filter feeders that can eat 20 per cent of their body weight a day in plankton, they’re able to grow and multiply faster than native species. In some areas in the U.S. carp populations are doubling every year.

Silver carp are also a hazard to people on the water. When disturbed by boat motors, the fish jump as much as two metres out of the water. Boaters and water skiers on the Illinois River have already been hit and injured.

Canadian and U.S. experts agree that Asian carp would thrive in the Great Lakes, and that quick action is the only way to prevent Asian carp from spreading if they are found in the Great Lakes Basin.

During the table-top exercise, local MNR staff described how they would place nets upstream and downstream to catch and identify fish in the river, test the fish to find out if they could reproduce, and confirm if the river habitat was suitable for Asian carp. The agencies involved also had to decide if any local species at risk might be harmed by the control measures, and keep governments, partners, the public and the media informed.

“Ontario’s recreational fishery contributes $500 million to the province’s economy each year, our commercial fishery is worth up to $215 million a year, and the Great Lakes ecosystem is priceless,” says Minister Jeffrey. “With so much at stake, we have to be prepared.” For the Silo, Lacey Williamson.