News / USA

    Invasive Asian Carp Threaten Ecosystems in Midwestern Waterways

    Asian Carp jumping in the Illinois River, where they are overtaking the native fish
    Asian Carp jumping in the Illinois River, where they are overtaking the native fish

    Asian Carp now outnumber native fish in many areas of the United States and their expansion particularly threatens the fragile ecosystems of the Great Lakes.

    In an effort to control algae growth, catfish farmers in the southern United States introduced Asian Carp - a species of fish found in China - into their ponds in the 1970s.  Flooding throughout the last several decades washed the fish out of those ponds into other waterways.  Gradually, the species multiplied and spread north along major rivers such as the Mississippi and the Illinois.  

    Anywhere else in the world, this would be a fisherman's dream, rivers so abundant with fish they jump out of the water, and often right into the boat.  But these are not the kind of fish that get anglers in the United States excited.  They are known as Asian Carp and the explosion of their population in the Illinois River is a concern to large-river ecologist Kevin Irons.

    "They compete with every other fish that's in our water," said Irons.  Irons is part of a team with the Illinois Natural History Survey, which is spearheading an effort to kill or contain Asian Carp before they reach Lake Michigan.  The group routinely patrols the Illinois River near Havana - searching for Asian Carp, which are not hard to find.  To understand where and how much the invasive species is spreading, Irons and his crew use a method known as electro fishing to stun the Asian Carp so they can be captured and counted.

    "There's as many as 4,100 adult silver carp per mile here on the middle Illinois River," said Irons.  "So they very quickly turn into about 13 tons per mile, and when you look at an eighty mile [129 kilometer] reach, it's phenomenal how much bio mass is taken up by these Asian Carp."

    There are two types of Asian Carp in the Illinois River - bighead and silver.  Both eat the same food as other - native - fish, such as catfish and buffalo.  Asian Carp can weigh up to 45 kilograms each, and eat up to half their body weight in food per day.

    Gradually, Asian Carp edge out the other native species in the river until they are one of the only kinds of fish left.  It is catastrophic to the natural ecosystem, and a problem for the fishing industry in the U.S., which looks at Asian Carp as an undesirable fish to eat.

    "Americans in general don't like a bony fish," said Irons.  "The rest of the world eats silver carp, they're actually the most cultured fish in the world.  And they're overfished almost everywhere because they are so desired for human consumption."

    With no natural predator in the water, and almost no domestic market to sell them as food, Asian Carp threaten to expand into waterways through the city of Chicago, and into Lake Michigan, about 320 kilometers northwest of Havana.

    "This is where we decided to draw the battle lines," said John Rogner, the assistant director of the Illinois Department of Natural Resources.  "We have an electrical barrier in place that we are confident will keep them from moving en masse into the Great Lakes.  And then our job is to put out the brush fires so to speak.  The fish that, for one reason or another, that found their way past the barrier, we suppressed them and try to take them out of the system to keep them from establishing in Lake Michigan."

    In June, a bighead Asian Carp was found above the electrical barrier about ten kilometers from Lake Michigan.  The discovery raised the level of concern that the invasive species was closer to Lake Michigan than previously thought.  But the Illinois Department of Natural Resources is confident their containment measures are working, as they have yet to find more Asian carp above the electric barrier.

    You May Like

    Beijing Warns Critics Over South China Sea Dispute

    Official warns critics that the more they challenge China's position regarding disputed territories in one of world’s busiest waterways, the more it will push back

    Will New Russian Force Be 'Putin’s Personal Army'?

    With broad powers to control riots, suppress dissent, National Guard may be aimed at sending a message to West as much as keeping peace at home

    Foreign Media in Pyongyang Barred From North Korean Party Congress

    Hundreds of international journalists invited to cover historic party meeting barred from entering actual event

    This forum has been closed.
    Comments
         
    There are no comments in this forum. Be first and add one

    Featured Videos

    Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
    Image Recognition Market Seen Doubling by 2020i
    X
    Ramon Taylor
    May 05, 2016 10:05 PM
    From auto tagging on Facebook to self-driving cars, image recognition technology as it exists today is still in its beginning phases, experts say — and will soon change the way users and corporations interact with the physical world. VOA's Ramon Taylor reports.
    Video

    Video Image Recognition Market Seen Doubling by 2020

    From auto tagging on Facebook to self-driving cars, image recognition technology as it exists today is still in its beginning phases, experts say — and will soon change the way users and corporations interact with the physical world. VOA's Ramon Taylor reports.
    Video

    Video Child Labor in Afghanistan Remains a Problem

    With war still raging in Afghanistan, the country also faces the problem of child labor as families put their school-age children to work to help make ends meet. But, thanks to VOA's Afghan Service, two families whose children had been working in a brick-making factory - to earn their livings and pay off family debts - now have a new lease on life. Zabihullah Ghazi reports.
    Video

    Video Kurdish Troops Recount Firefight Which Killed US Navy SEAL

    A U.S. Navy SEAL killed Tuesday, when Islamic State fighters punched through Kurdish lines in northern Iraq, was part of a quick reaction force sent to extract other U.S. troops trapped by the surprise offensive. VOA's Kawa Omar spoke with Kurdish troops in the town of Telskuf -- the scene of what U.S. officials called a "dynamic firefight."
    Video

    Video British Lawmakers Warn EU Exit Talks Could Last A Decade

    Leaving the European Union would mean difficult negotiations that could take years to complete, according to a bipartisan group of British lawmakers. While the group did not recommend a vote either way, the lawmakers noted trade deals between the EU and non-EU states take between four and nine years on average. Henry Ridgwell reports on the mounting debate over whether Britain should stay or exit the EU as the June vote approaches.
    Video

    Video NASA Astronauts Train for Commercial Space Flights

    Since the last Shuttle flight in 2011, the United States has been relying on Russian rockets to launch fresh crews to the International Space Station. But that may change in the next few years. NASA and several private space companies are developing advanced capsules capable of taking humans into low orbit and beyond. As VOA's George Putic reports, astronauts are already training for commercial spacecraft in flight simulators.
    Video

    Video US Worried Political Chaos in Iraq Will Hurt IS Fight

    The White House is expressing concern about rising political chaos in Iraq and the impact it could have on the fight against the Islamic State. The U.S. says Iraq needs a stable, central government to help push back the group. But some say Baghdad may not have a unified government any time soon. VOA's White House correspondent Mary Alice Salinas reports.
    Video

    Video Press Freedom in Myanmar Fragile, Limited

    As Myanmar begins a new era with a democratically elected government, many issues of the past confront the new leadership. Among them is press freedom in a country where journalists have been routinely harassed or jailed.
    Video

    Video Taliban Threats Force Messi Fan to Leave Afghanistan

    A young Afghan boy, who recently received autographed shirts and a football from his soccer hero Lionel Messi, has fled his country due to safety concerns. He and his family are now taking refuge in neighboring Pakistan. VOA's Ayaz Gul reports from Islamabad.
    Video

    Video Major Rubbish Burning Experiment Captures Destructive Greenhouse Gases

    The world’s first test to capture environmentally harmful carbon dioxide gases from the fumes of burning rubbish took place recently in Oslo, Norway. The successful experiment at the city's main incinerator plant, showcased a method for capturing most of the carbon dioxide. VOA’s Deborah Block has more.
    Video

    Video EU Visa Block Threatens To Derail EU-Turkey Migrant Deal

    Turkish citizens could soon benefit from visa-free travel to Europe as part of the recent deal between the EU and Ankara to stem the flow of refugees. In return, Turkey has pledged to keep the migrants on Turkish soil and crack down on those who are smuggling them. Brussels is set to publish its latest progress report Wednesday — but as Henry Ridgwell reports from London, many EU lawmakers are threatening to veto the deal over human rights concerns.
    Video

    Video Tensions Rising Ahead of South China Sea Ruling

    As the Philippines awaits an international arbitration ruling on a challenge to China's claims to nearly all of the South China Sea, it is already becoming clear that regardless of which way the decision goes, the dispute is intensifying. VOA’s Bill Ide has more from Beijing.
    Video

    Video Painting Captures President Lincoln Assassination Aftermath

    A newly restored painting captures the moments following President Abraham Lincoln’s assassination in 1865. It was recently unveiled at Ford’s Theatre in Washington, where America’s 16th president was shot. It is the only known painting by an eyewitness that captures the horror of that fateful night. VOA’s Julie Taboh tells us more about the painting and what it took to restore it to its original condition.

    Special Report

    Adrift The Invisible African Diaspora