Keeping a Big Fish From Butting In

  • Asian Carp can grow up to 110 pounds (Photo courtesy of the US Fish and Wildlife Service)

There are invasive fish swimming their
way toward the Great Lakes. If they get in,
they could swallow up a multi-billion dollar
sport fishing industry. Mark Brush reports,
officials are investing millions of dollars
to keep Asian Carp out of the Great Lakes:

Transcript

There are invasive fish swimming their
way toward the Great Lakes. If they get in,
they could swallow up a multi-billion dollar
sport fishing industry. Mark Brush reports,
officials are investing millions of dollars
to keep Asian Carp out of the Great Lakes:

Asian Carp were imported by fish farms in Mississippi and Arkansas to control algae.
But the fish escaped during floods. They swam out of the fish ponds, and into the Mississippi
river. And they’ve been moving north ever since.

(sound of boats)

Thad Cook is on a tributary of the Mississippi River in Illinois. This river is more than
400 miles upstream from where Asian Carp first escaped the fish farms.

Cook is looking
for two types of Asian Carp known as Silver and Bighead Carp. It turns out t’s not hard to find them. He dips an electrified pole into the water – and the fish jump right out of the
river and into the boat.

(sound of fish flopping in boat)

Cook is with the Illinois Natural History Survey. His group, along with several others,
has been making trips like this one for years. They’ve been keeping a close eye on where
the fish are going. He takes a guess at how big this fish is.

“No he’ll go… uh.. he’s probably…”

“Hold him out there Jimmy!”

“Yep, six, seven, eight, nine, ten pounds.” (Laughter)

His fish story could have gone a lot further. Some types of these Carp can get up to a
hundred pounds. There aren’t many fish that can compete with an appetite like that.

Biologists are finding that these carp are pushing native fish species aside as they spread
north through the Mississippi River system. And some fear it’s only a matter of time
before they swim their way into the Great Lakes.

David Jude is a fisheries biologist with the University of Michigan.

“I’m very concerned about what impact they would have in the Great Lakes because
they’re planktovores which means they filter zooplankton from the water column. And, they’re just huge fish. And so they have the potential for having
a tremendous impact on our ecosystems.”

He says the silver and bighead carps are filter feeders. They pass up eating smaller fish –
and head straight for the bottom of the food chain.

Jude says if Asian carp get in, it’ll make a bad situation worse. The Great Lakes are
already losing zooplankton from other invasive species. Asian Carp could
destroy a 4 billion dollar a year sport fishing industry.

(sound of canal)

And here is where the battle line is being drawn. The fish have been spotted thirty miles
downstream from this spot on the Chicago Ship and Sanitary Canal. A century ago,
engineers blasted through solid rock to connect the Great Lakes with the Mississippi
River system.

Chuck Shea is with the U.S. Army Corps of Engineers.

“Any type of fish that would want to move between Lake Michigan and the Mississippi
river basin – has to pass through the Chicago Sanitary and Ship Canal – there’s no other way to swim through. So, they have to come through this body of water we’re standing in front
of right now.”

Shea is in charge of the construction and maintenance of two electric fish barriers along this canal.
When this barrier is online, machines will pulse electricity into the water. The electric current shocks
the fish – making them swim away.

This barrier hasn’t been turned on yet. There have been delays due to funding shortages. And they’re still
doing safety testing with the Coast Guard.

Right now, the only thing that would keep the carp from getting into the Great Lakes is a temporary electric
barrier built six years ago.

The good news is that there still seems to be a little time. Biologists say, so far, Asian Carp haven’t moved any
closer than thirty miles from the barrier for the last couple of years.

For The Environment Report, I’m Mark Brush.

Related Links

Fish Disease Spreads to New Waters

  • Signs of VHS, from the Michigan DNR (Photo courtesy of the US Fish and Wildlife Service)

Despite efforts to stop it, there’s a new
indication a nasty fish virus is spreading. Christina
Shockley has the latest:

Transcript

Despite efforts to stop it, there’s a new
indication a nasty fish virus is spreading. Christina
Shockley has the latest:

The name even sounds scary: viral hemorrhagic septicemia. It causes fish to bleed to
death.

VHS has been in the Great Lakes for at least three years. Officials have been trying
to confine it to the Great Lakes basin, but now it’s spread into central Ohio.

Elmer Heyob is with the Ohio Department of Natural Resources.

He says the worst-case scenario is that VHS could get into a hatchery that stocks fish
for lakes and streams, and that cloud hurt the region’s economy.

“First the hatcheries, then the fishery, then the people that support the fishery, the
boating industry, it just goes on and on.”

Heyob says to stop VHS from spreading, you shouldn’t move fish from one lake to
another, and you should clean boating and fishing equipment before you move to a
different lake.

Researchers believe eventually fish build up immunity to the disease.

VHS does not pose a threat to people.

For The Environment Report, I’m Christina Shockley.

Related Links

Airlifts for Wildlife

  • On March 5, 2008 the Wisconsin Army National Guard airlifted 75 tons of mature trees to improve wildlife habitat in the Kettle Moraine State Forest. The aviation training mission used UH-60 Black Hawk helicopters to lift the trees on the east shore of Long Lake. (Photo by Steve Apps, courtesy of the Wisconsin State Journal)

There’s an old saying that goes ‘There’s more
life in a dead tree than a live one.’ That’s because
bugs and birds and burrowing animals can all find homes
in dead trees. Trees that are cut down are also sometimes
dropped into lakes to make habitat for fish. Chuck
Quirmbach reports sometimes getting the right tree to the
right spot requires some creative thinking:

Transcript

There’s an old saying that goes ‘There’s more
life in a dead tree than a live one.’ That’s because
bugs and birds and burrowing animals can all find homes
in dead trees. Trees that are cut down are also sometimes
dropped into lakes to make habitat for fish. Chuck
Quirmbach reports sometimes getting the right tree to the
right spot requires some creative thinking:

(helicopter noise)

It’s not every day you seen an upside down tree flying through the air.

But this Blackhawk helicopter is skimming along with a big tree dangling on a
line beneath it.

We’ll get to why in a moment. But to do that you’ve got to meet the guy who thought
up the idea.

Mark Sesing is sitting in his pickup truck. He’s
a wildlife manager – actually, a water specialist. He’s looking through the windshield at a
stretch of shoreline of Long Lake in Wisconsin.

“The habitat’s been stripped away. We’ve got piers; we’ve got boats, boathouses, we’ve got houses
and cottages. All that development has resulted in, I guess what I’ll call a
sterilization of the shore.”

On the other side of the lake there’s an area that’s a bit better for birds and fish.
But Sesing thought the wildlife needed a little help. He knew putting some dead
trees there could benefit the animals.

Put the crown of the tree in the water for the fish, so they can hide from predators
and lay eggs in the thicket. Put the trunk on the shore, and all kinds of animals can
make a home. Or birds can find bugs in the dead tree.

But there was a problem: you couldn’t get to the area with trucks without cutting a road down a steep hillside. And Mark Sesing was not interested in damaging more of the
shoreline.

So he got to thinking. Why not get the Wisconsin Air National Guard to help?

(helicopter sound)

So why would the Air Guard want to move trees? Practice!

Chief Warrant Officer Dirk Brandt is with the National Guard’s 832nd medical
company. He says practicing lifting trees and placing them on the shoreline could
help pilots and crew prepare for a med.-evac. lift in a war zone.

“If it was medical supplies, or critical medical supplies, since our unit is med.-evac., then the more we practice with, I guess you could say, ‘inanimate objects’, then the
better off when we actually physically have to do it.”

The airlift worked like this: first, one of the copters would hover over a forested
area about a quarter mile from the lake. That’s where trees had been cut down to
improve the health of the woods.

(hover sound)

Then, ground crew would grab a nylon strap hanging down from the aircraft and wrap it around a tree.

(helicopter lifting sound)

The helicopter would then go up. And carry the dead tree to the water’s edge.

(helicopter fades)

By the time the project was done, there were 23 dead trees placed along about a-
quarter mile of lake shoreline.

Wildlife managers will start watching the trees and collecting scientific data on the
project this summer. They estimate the trees will provide habitat for fish and birds for
the next ten to twenty years.

For the Environment report, I’m Chuck Quirmbach.

Related Links

Zebra Mussels 20 Years Later

  • (Photo courtesy of the US Fish and Wildlife Service)

The invasive zebra mussel has disrupted food chains and
caused billions of dollars in damage across the country. This
year marks the twentieth anniversary of the discovery of zebra
mussels. Mark Brush reports:

Transcript

The invasive zebra mussel has disrupted food chains and
caused billions of dollars in damage across the country. This
year marks the twentieth anniversary of the discovery of zebra
mussels. Mark Brush reports:

The invasive mussels first arrived here in the ballast water of foreign ships. The mussels
are really good at filtering food out of the water column – such as algae and zooplankton –
food that would eventually go to fish.

David Jude is a research scientist at the University of Michigan. He says, 20 years later,
researchers are still fighting a perception that zebra mussels are good for the
environment. That’s because the mussels do make the water clearer.

“Well if you get clear water that means that some of the algae and some of the
zooplankton that are in that water, that are part of the food chain, that are fueling our fish are going to be destroyed, degraded and
damaged.”

The Great Lakes have been hit hard by the invasive zebra mussels – and by their close
cousins – known as quagga mussels. Jude says in many places popular sport fish such as
salmon and yellow perch are having a tough time finding enough food to survive.

For The Environment Report, I’m Mark Brush.

Related Links

Safer Wiggly Worms

People who go fishing might be attracted to a new environmentally friendly lure. Chuck Quirmbach reports:

Transcript

People who go fishing might be attracted to a new environmentally friendly lure. Chuck Quirmbach reports:

Soft plastic lures such as wiggly worms are often made more flexible by adding chemical compounds called phthalates. These chemicals have been linked to adverse health effects… and when the lures are torn off a hook, the compounds pollute waters.


Tim Osswald is a mechanical engineering professor at the University of Wisconsin. He’s helped a manufacturer come up with a process that uses tiny plastic fibers inside the lures. Osswald says the microfibers make the lures stronger.


“Using this technology they would no longer end up at the bottom of the lake. Or at least at a much, much smaller rate.”


Oswald says the lures no longer stretch like a piece of rubber but still turn and wiggle and have that ‘worm-like feel.’ He says the reinforced lure might cost a little more in the stores. But he says they’re likely to last longer.


For the Environment Report, I’m Chuck Quirmbach.

Related Links

Killing the Common Carp

  • The Common Carp was introduced a century ago and has been causing havoc in rivers, ponds and lakes ever since. (Image by Duane Raver, courtesy of the U.S. Fish and Wildlife Service)

In thousands of lakes and ponds across the country, there’s a fish messing up the water.
Some biologists say we’ve never seen these lakes the way nature intended due to the
common carp. The usual method to get rid of the common carp is to kill everything in
the lake and start over. Some biologists think there’s got to be a better way. Joel
Grostephan reports:

Transcript

In thousands of lakes and ponds across the country, there’s a fish messing up the water.
Some biologists say we’ve never seen these lakes the way nature intended due to the common carp. The usual method to get rid of the common carp is to kill everything in
the lake and start over. Some biologists think there’s got to be a better way. Joel
Grostephan reports:


Common carp are like underwater pigs. They root up aquatic plants. They constantly stir
up the mud in the bottoms of lakes, making them murky. And in some lakes, common
carp make up more than half of the total weight of fish. Peter Sorensen is a fisheries
professor at the University of Minnesota:


“With their habit of rooting around night and day, they will completely destroy the
bottoms of lakes, so they become cesspools.”


And it ruins the habitat for many birds and fish too:


“The fact is they are doing enormous damage. At a level that I don’t think people
fully realize. They are living with us, and we don’t know in many cases, what
these lakes and streams and rivers should be like and could be like.”


Common carp have been in U.S. lakes and ponds for more than a century. They came
from Europe and Asia. At the request of new immigrants, the United States government
stocked carp in lakes and rivers in the late 1800’s. Sorensen says it didn’t take long before
there were problems.


By the early 1900’s, it clicked this was a huge mistake, and they started to remove
them. Good records were not kept, and Sorensen says the overall impression is that
removal efforts didn’t work. Most attempts to control the fish are still unreliable. The fish
is very tough. It spawns every year, and females produce nearly a million eggs.


Fisheries managers try to control carp the best they know how. Some hire commercial
fisherman to net the carp. They also use poison — killing all the carp and all the other
fish in the lake and then start over.


Fisheries managers currently use a chemical called Rotenone, which they say is not toxic
to humans. Lee Sundmark is with the Minnesota Department of Natural Resources:


“If we see that a lake that a lake way out of balance, might have a lot of carp,
bullheads, tried biological means, and they aren’t working. Sometimes we get to the
point where we use Rotenone to treat it. We basically clean a lake out, and then we
might restock it.”


The trouble is sometimes not all the carp die. And just a handful of them can reproduce
and dominate that lake within a few years. Peter Sorensen and his team of researchers
believe there’s a better way. Sorenson says he does not object to Rotenone poisoning out-
of-hand but, he says, it’s expensive, heavy handed. He and his team have been studying
carp-infested lakes for the past three years to see if they can come up with a new method
to control the fish.


On this cold day, the biologists are surgically implanting radio tags in carp. The
scientists will be tracking these fish so they can find weak points in their lifecycle.
Prezmyslaw Bajer and his colleague Mario Traveline are about to operate on a fish they
caught:


“She will be collecting data that we will then use to remove carp from the lake. She
will be our carp spy.”


The researchers say if they can figure out the habits, and the instincts of the Common
Carp, they will able to control them in way that’s both — effective, and doesn’t kill all the
other fish in the lake. The study’s lead investigator, Sorensen, says this is important
work:


“Something must be done. This is our first, and most damaging species, and if we
don’t do something with this, that like I said, we can do something about — I wonder
what hope there is for any of them. This is to me, the one you got to take out.”


Sorensen says he hopes he can create a model that can be replicated in different parts of
the country. If he’s successful, the ponds, lakes and rivers that have been assaulted by the
carp for the last century might once again be able to host fish and other wildlife that were
forced out.


For the Environment Report, I’m Joel Grostephan.

Related Links

Sport Fishing Drops on Great Lakes

  • Researchers are trying to figure out why fewer people are fishing the Great Lakes. (Photo by Lester Graham)

A national survey of anglers is trying to determine why
fewer people are fishing the Great Lakes. Peter Payette
reports:

Transcript

A national survey of anglers is trying to determine why
fewer people are fishing the Great Lakes. Peter Payette
reports:


The Great Lakes have seen a steep decline in sport fishing
in recent years. But Rob Southwick says there’s little or
no research to explain why.


His firm, Southwick Associates, conducts a national
survey every month on recreational fishing. In December
they asked anglers about the Great Lakes.


Southwick says despite advisories about contamination in
fish in the lakes, less than one percent of those surveyed
mentioned health warnings as the problem.


We think that was a major issue in the late eighties and
early nineties but people are not telling us that is a reason
why they are staying away from the Great Lakes anymore.


Southwick says people are finding other lakes and streams
to fish, even though no one is complaining about the
quality of fishing on the big lakes.


But he thinks the time and gear needed to fish in the deep
wide waters of the Great Lakes are part of the problem.


For the Environment Report, I’m Peter Payette.

Related Links

Bird and Fish Poisoning Spreads in Great Lakes

  • Botulism is killing fish and the shorebirds that eat them. The cause is likely due to a disruption in the ecosystem by invasive zebra and quagga mussels. (Photo by Lester Graham)

A deadly toxin is killing fish and birds along the Great Lakes shoreline.
Researchers think type-E botulism works its way up the food chain from
the bottom of the lake through several invasive species. Bob Allen
reports:

Transcript

A deadly toxin is killing fish and birds along the Great Lakes shoreline.
Researchers think type-E botulism works its way up the food chain from
the bottom of the lake through several invasive species. Bob Allen
reports:


These days, Ken Hyde dreads walking the pristine sandy beaches along
the Sleeping Bear Dunes. He’s the biologist in this national lakeshore
along the Michigan coast, and he only has to hike maybe a hundred feet
to find a dead bird twisted head down and half-buried in the sand:


“This is a cormorant. Just in the last two or three weeks we’re
starting to see a lot more of them. So they’re probably starting to
migrate down from the upper parts of the lake.”



Last year botulism killed over 2,500 dead birds along this 35 mile stretch
of shoreline, mostly gulls and diving ducks, including nearly 200 loons
migrating south from Canada.


This year the die-offs started earlier in the summer and struck more
species. The park lost four endangered piping plovers. The National Park
Service brought in a research team from Minnesota to look for answers.
They’ve been diving in the lakeshore now for two years.


What they’ve found is a huge shoal stretching more than a mile off shore.
It’s covered with native green algae and loaded with invasive zebra and
quagga mussels:


The Park’s research boat docks at a small village along Lake Michigan.
Dive team leader Brenda Moraska Lafrancois was surprised when she
first saw the underwater landscape:


“Last year when we first dove this area we went down and it was
shocking how little of the biomass down there was native. I think
we’re looking at a really altered system.”


Here’s what researchers know so far. The mussels filter nutrients from
the water, the clearer water allows more sunlight to reach the bottom, and
that spurs more algae growth. For good measure, the mussels excrete
phosphorus, in effect fertilizing the algae in the near shore zone. When
millions of mussels and big globs of algae begin to decompose, that uses up
most of the oxygen in water near the bottom of the lake, and that’s a
condition just right for a naturally occurring botulism to grow.


So how does the botulism migrate from the bottom to the surface and
poison shorebirds? Enter the round goby. It’s a small invasive fish that
comes from the same Caspian Sea area where zebra mussels originated.


Last year the research team at Sleeping Bear saw gobies in some places.
Now, says Byron Carnes, everywhere they looked when diving on algae
beds there solid sheets of mussels and blankets of gobies, and he
watched them feeding on mussels:


“Part of the zebra quagga mussel that is the juiciest these guys tend
to go right in and do this frenzy feeding where they just come in and
start pounding away at all the broken shells and trying to get out as
much of the good stuff inside the quagga mussel as they possibly
can.”


Mussels don’t have a nervous system, so they aren’t harmed by botulism
toxin. But when gobies get a dose they flop around on the surface for a
day or so while succumbing, and that’s when shorebirds pick up an easy
but potentially deadly meal.


Some diving ducks may also get poisoned by feeding directly on the
mussels. That’s the theory most scientists in the field think explains
what’s happening, but Harvey Bootsma says it’s not active all the time, so
it’s hard to prove each step. He’s with the Great Lakes Water Institute in
Milwaukee:


“I think the problem is it’s usually a sporadic and short-lived event
when this occurs. And unless somebody happens to be fortuitously
collecting the right samples at the right place and the right time it”s
very difficult to pin down the process as it’s occurring.”



While researchers try to pin down the effects of invasive species in one
place, the cycle spins off somewhere else. This fall there are half as
many dead birds along the Sleeping Bear Dunes shore as last year, but
the die-off is now spreading farther north along the Lake Michigan coast,
and there have been similar outbreaks along Lakes Erie and Huron.


So far Harvey Bootsma says there are no good solutions to break the
cycle of algae, mussels and gobies that scientists think is transporting
botulism toxin to shorebirds.


“And it’s just a great example of how huge an impact a new species
can have on an ecosystem. And I think it makes it all the more
imperative that we try to stem the tide of exotic species coming into
the Great Lakes.”


Researchers say it may take decades for the Great Lakes to recover from
the effects, if they ever do.


For the Environment Report, I’m Bob Allen.

Related Links

Indian Treaty 2.0

Five Indian tribes claim the right to hunt, fish and gather on lands
and lakes they sold to the federal government years ago. Their
claim extends back to the Treaty of 1836. But it’s been
challenged in court by state officials who say those rights expired
long ago. As Bob Allen reports, now all the parties have reached
an uneasy compromise:

Transcript

Five Indian tribes claim the right to hunt, fish and gather on lands
and lakes they sold to the federal government years ago. Their
claim extends back to the Treaty of 1836. But it’s been
challenged in court by state officials who say those rights expired
long ago. As Bob Allen reports, now all the parties have reached
an uneasy compromise:


170 years ago, the tribes sold millions of acres to the U.S.
government. But they reserved for themselves the right to hunt
fish and gather foods and medicines until the land was settled.


Hank Bailey is an elder with the Grand Traverse Band of Ottawa
and Chippewa. He’s scouting out a favorite fall hunting spot
even though it’s pelting rain:


“I know these hills well all around here just from exploring
it…hunting, gathering mushrooms…”


Bailey is a direct descendant from a tribal leader who signed the
original treaty. He says the exercise of those rights in times past
were the difference between survival and starvation. And he
doesn’t think a new piece of paper can ever erase what his
ancestors preserved:


“They were told that this treaty was forever. And I know in
my heart that’s what they believed in. And they thought well
as long as we can hunt, fish and gather we will be able to
survive as a people. This is what bothers me about is, I’m
being told now that when we sign this paper, this is going to
be forever and here we go again.”


Four years ago, the state of Michigan went to court to argue tribal
hunting and fishing rights had expired because the land had been
settled long ago.


But then state officials noticed court rulings in other Great Lakes
states that upheld treaties and in some case awarded tribes as
much as half of the natural resources.


Tribal leaders thought they had a strong case, but they too were
leery of how today’s courts might interpret the phrase that said
their treaty rights exist “until the land is settled,” so the parties
were motivated to negotiate a deal outside court.


Jim Ekdahl is with the state Department of Natural Resources:


“We were in a strange kind of legal limbo where the state
wasn’t exactly sure what the ground rules should be in
light of the fact the federal courts hadn’t ruled on the inland
rights. The tribes weren’t 100% confident that they could
advise their membership in terms of what they ought to be
doing.”


From legal limbo, there are now 130 pages of rules and
regulations on how and where the tribes can exercise their rights.
There’s been some grumbling on both sides.


Some tribal members complain, with some exaggeration, that they
have to fill out a form now before they can pick a single
blueberry, and there are sportsmen who don’t like a special set of
rules for Indians.


What the tribes have agreed to is their rights to hunt, fish and
gather will only apply on lands open to the public. And they only
can take enough for subsistence, not for commercial sale.


Tribal resource managers say what their members take is a drop
in the bucket of the overall resource. And Jim Ekdahl with the
state says there’s still plenty to go around:


“There’s sufficient harvestable surpluses of resources
available to accommodate tribal interests. There’s essentially
no effect on harvest by state licensed recreational users. And
essentially no changes in state regulations are gonna be required as this
thing moves forward.”


The parties to the agreement say is it avoids a bitter legal battle
that could last a decade or more and cost millions of dollars.
Both sides remember an ugly dispute that raged 30 years ago
when tribes reasserted their right to fish commercially with nets
in the Great Lakes.


Matthew Fletcher is a specialist in tribal law at Michigan State
University. As far as he can tell, this is the first time a state has
voluntarily recognized tribal treaty rights extending to off-
reservation lands without being told to do so by a court:


“There are tribes and there are treaties nationwide that have
similar language. And I’m sure they’re watching this very
carefully. And this kind of consent decree is going to create a
kind of precedent for other states that are engaging in similar
kinds of negotiations.”


The agreement still needs to be accepted by a federal judge
before it becomes binding in law. For tribal elder Hank Bailey
the deal might chip away some free exercise of historic rights,
but it also reasserts that those rights can’t ever be taken away:


“For me that’s… that is about the most powerful part of it is
being able to know that I will continue to be an Odawa, black
wolf clan, a man… somebody that respects the resources
around me. And I’m willing to work with anybody else that
feels the same way, whether they’re tribal or not.”


For the Environment Report, I’m Bob Allen.

Related Links

Hatchery Fish Unprepared for Wild World

A new study finds if fish raised in captivity breed with fish in the
wild that might hurt the wild fish populations. Rebecca Williams
reports that’s because the captive fish are genetically weaker:

Transcript

A new study finds if fish raised in captivity breed with fish in the
wild that might hurt the wild fish populations. Rebecca Williams
reports that’s because the captive fish are genetically weaker:


Billions of fish are raised in hatcheries and released into lakes and
rivers.


But a new study in the journal Science says there could be
problems with that. The researchers found a type of salmon bred in
captivity quickly adapted to their less stressful life in the hatchery.
So they weren’t prepared for a cutthroat life in the wild.


Michael Blouin is an author of the study. He says the babies of
captive-bred fish have trouble finding food and aren’t very good at
escaping predators.


“If you have large numbers of hatchery fish mixing with wild
populations, the fear is they’ll be passing those genes to the wild
population and thereby dragging down the fitness of the wild
population.”


Blouin says this has not been proven outside of the laboratory yet, but he says the lab results raise some concerns about the widespread
use of captive fish to boost wild fish populations.


For the Environment Report, I’m Rebecca Williams.