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Entries in invasive species (211)

Tuesday
May192015

Public Outcry Forces Minnesota to Delay Invasive Species Training Program

Following public outcry from resort owners, anglers and boaters, the Minnesota Department of Natural Resources (DNR) will postpone an invasive species training and trailer decal program that was set to go into effect July 1.

In the state legislature, a House committee voted to cancel the law, while a Senate panel has proposed a compromise that would delay implementation and remove charges for the class and decals. As the law was originally enacted, “lake service providers” are required to pay $50 for a three-year permit.

Passed in 2012, the law also requires boaters and others who tow boats and water-related equipment to take classes about how to avoid transporting aquatic invasive species, such as zebra mussels and milfoil, form one water body to another and then buy decals for their trailers to confirm that they have taken the class (usually online).

The DNR supports the education that would be provided under this law, but recognizes there are some concerns with the way the law is currently written,” the agency said. “For example, people transporting boats on trailers through Minnesota to another destination are required to take the course and display a decal even if they don’t put their boat in Minnesota waters.”

DNR Assistant Commissioner Bob Meier added, “With the legislative interest in this educational program and ongoing discussions about possible changes, we are postponing the launch until we see if the legislature acts this session to modify the program.”

State Sen. Tom Saxhaug said, “Education is critical to this whole aquatic invasive species idea. We are not trying to stop tourism in the state in any way, shape or form, but what we are trying to do is to make sure everyone in the state knows how to clean their boats.”

For funding its Invasive Species Program, Minnesota includes a $5 surcharge on watercraft registered in the state and a $2 surcharge on nonresident fishing licenses. Resort owners say current fees and decal requirements already have cost them business. 

Monday
May042015

Lionfish Threat Continues to Spread

As harmful invasive fish species, Asian carp seem to garner most of the headlines, mostly because of the threat that they pose to the Great Lakes.  But the lionfish, a marine invader from the Pacific Ocean, is decimating native species through much of the Caribbean, as well as spreading up the Atlantic coast and across the Gulf of Mexico. (See previous post.)

And now it’s been discovered off the coast of Brazil, which suggests the entire  coast of South America likely will be invaded.

“When the researchers analysed the fish’s DNA, they found that it matched the genetic signature of the Caribbean lionfish population, and not that of specimens from their native Indo-Pacific region. This suggests that the fish may have reached Brazil through natural larval dispersal from the Caribbean, the study’s authors say,” reports Nature.

“But Mark Hixon, a marine ecologist at the University of Hawaii at Manoa, says that ocean currents typically flow in the wrong direction for larval dispersal from the Caribbean to the southeastern Brazilian coast. He says that it is just as likely that the lionfish was brought to Brazil by humans. ‘Lionfish are easy to capture and make beautiful pets,’ says Hixon. ‘It’s easy to imagine boaters carrying lionfish as short-term pets in bait tanks or other containers on their vessels.’”

The Invasive Species Action Network adds this:

“Lionfish are vicious predators that eat any fish or invertebrate they can fit in their mouth. They reproduce easily and the rate at which they have expanded their range shows that they are thriving in this environment. With no predators in our waters they are rapidly impacting many habitats.

“Humans can have an impact. Fortunately, lionfish are very tasty and many restaurants have added them to the menu. In many areas concentrated spearfishing is keeping local populations in check but this is not a practical method of control across their range. In the USA, NOAA is the lead agency on this problem and they are the best source for lionfish information and research.

“NOAA has recently released the draft National Invasive Lionfish Prevention and Management Plan While the plan is still in draft form, it is scheduled to be approved at the next meeting of the Aquatic Nuisance Species Task Force meeting scheduled for the first full week in May.”

Thursday
Apr302015

Florida Plans Lionfish Removal and Awareness Day

The Florida Fish and Wildlife Conservation Commission (FWC) will celebrate its first Lionfish Removal and Awareness Day wtih a weekend of events across the state, starting Saturday, May 16, including a festival in Pensacola.

Lionfish Removal and Awareness Day (established to be the first Saturday after Mother’s Day each year) was created by FWC Commissioners to help draw attention to the lionfish issue. Lionfish are a nonnative, invasive species that have a potential negative impact on native species and habitat.

“We are thankful to all the groups that helped organize the Lionfish Removal and Awareness Day Festival and Tournament in Pensacola as well as all those who are hosting their own events across the state,” said FWC Commissioner Bo Rivard. “These efforts will help ensure we keep the lionfish issue on the forefront of everyone’s thoughts and minds.”

The FWC encourages all divers to remove as many lionfish on the weekend of May 16-17, no matter where they are in Florida.

The FWC also will unveil its Reef Ranger program this same weekend.

 Lionfish Removal and Awareness Day Festival and Tournament, Pensacola at Plaza de Luna, 900 S. Palafox St., Pensacola, on May 16-17.

This event will include celebrity chef demonstrations, lionfish tastings, fillet demos, a visit from world famous artist and marine conservationist Guy Harvey, family-friendly activities such as games and a fountain to play in, and more than 40 art, diving and conservation vendors; there will also be music, food and tons of helpful lionfish information.

The festival starts at 10 a.m. and runs until 5 p.m. each day. Updates will be provided from various other events across the state.

Want to participate in the tournament? Visit the Gulf Coast Lionfish Coalition (GCLC) webpage at Gulfcoastlionfish.com/lionfish_events to learn more or visit its Facebook page at Facebook.com/gulfcoastlionfishcoalition. GCLC is offering prize money for a number of categories, as well as chances to win great prizes with raffle tickets. Come by to check out the researchers counting and filleting fish. 

Meanwhile . . . 


The exotic lionfish is spreading up the Atlantic coast and along the Gulf coast, as well as throughout the Caribbean. A potential world record recently was caught off the coast of Mississippi.

Wednesday
Apr292015

Survey Reveals Carp DNA Throughout Chicago Waterway System

If Asian carp aren’t in the Great Lakes, they can’t get much closer. Sampling of the Chicago Area Waterway System (CAWS) last fall revealed carp eDNA throughout the system, including near a lock in downtown Chicago, just one block from Lake Michigan.

“Prevention needs to happen now and the U.S. Army Corps of Engineers and other key decision-makers should take swift action,” said the non-profit Alliance for the Great Lakes (AGL), which charges that the Corps lacks direction, as revealed in its Great Lakes-Mississippi River Interbasin Study.

“DNA evidence is an early detection tool to understand the potential movement of carp, and testing results have consistently found DNA hits on a path closer and closer to the Great Lakes over the past several years of testing,” the group added.

The Corps report outlined eight possible ways to stop migration of Asian carp into the Great Lakes, with the most expensive being an $18.3 billion separation of the CAWS from Lake Michigan. Meanwhile, the Alliance supports measures to temporarily reduce risk, including construction of a new channel and control technologies in the approach to Brandon Road lock and research on reconfiguration of locks in general.

But long-term issues with Chicago’s water system infrastructure must be addressed to keep the carp out, emphasized Jennifer Caddick, AGL spokesperson.

“It’s complicated. You can’t just build one dam and solve the whole problem,” she said. “There’s a lot of work to be done, but we need intensive focus.”

If/when Asian carp become established in the Great Lakes, consequences could be catastrophic for the multi-billion-dollar sport fishery. That’s because the exotic fish are fast-growing, prolific, plankton eaters. They likely would outcompete the many young and adult native fishes that rely on phytoplankton and zooplankton for their primary forage.

Additionally, the U.S. Geological Survey has identified 22 rivers in the U.S. portion of the Great Lakes that would provide suitable spawning habitat for Asian carp.

Sunday
Apr192015

Largemouth Bass Chow Down on Bighead Carp in Lab Tests

Bighead carp grow large. But bass eat them when they're smalll and more vulnerable

“Asian carp” actually refers to two species of exotic fish, not one. As they spread throughout the nation’s rivers, both pose threats to native fisheries.

As it turns out, though, there seems to be a big difference in their vulnerability to predation. That’s bad news for bighead carp, which grow larger, feed more exclusively on zooplankton, and are less abundant. And good news for the smaller silver carp, which have become infamous for endangering boaters with their leaping antics.

Researchers at the Illinois Natural History Museum and University of Illinois put small samples of both into experimental pools, along with bluegill, gizzard shad, and golden shiners. Largemouth bass in those pools ate more bighead carp than any other species, including silver carp. Scientists hypothesized that this may mean that young silver carp are more “street smart” than their bighead cousins.

While it’s good to know that bass can and likely do eat these invaders, especially bighead carp, whether this predation will help control them remains to be seen.

“Although new research is confirming that native fish can and do consume Asian carp, this not mean that all is well,” cautioned the Michigan State University Extension (MSUE). “In the LaGrange Reach of the Illinois River, at least seven native fish are preying on Asian carp. Even so, this reach has one of the highest densities of silver carp recorded anywhere in the world.

“Native plankton-eating fish like gizzard shad and bigmouth buffalo have declined and the long-term effects on gamefish are still uncertain.”

In 2008, biologists estimated more than 5,000 silver carp per mile in that nearly 80-mile stretch of the river, with a biomass of 705 metric tons.

“In the Great Lakes, we already know that native fish are adapting to non-prey items like quagga mussels and round gobies,” MSUE continued. “We also know that predation has not been enough to eliminate these species or prevent their negative effects. The same is likely true for Asian carp.”

(This article appeared originally in B.A.S.S. Times.)