Ten Threats: Mercury and Health Problems

  • Fish advisories warn about possible mercury contamination, but many people aren't aware of the risks. (Photo by Lester Graham)

There’s no disputing that fish is healthful food, but too much of certain
kinds of fish can be dangerous, especially if you’re a woman planning to
have children. That’s because some fish contain elevated levels of
mercury. Mercury is a toxic contaminant that can cause neurological
damage. Julie Halpert filed this report about the harms mercury can
cause:

Transcript

We’re continuing our series ‘Ten Threats to the Great Lakes.’ One of the
threats identified by experts was air pollution that in turn pollutes the
lakes. The Great Lakes Radio Consortium’s Lester Graham is our guide
in this series. He says the next report looks at one pollutant that
eventually affects people.


There’s no disputing that fish is healthful food, but too much of certain
kinds of fish can be dangerous, especially if you’re a woman planning to
have children. That’s because some fish contain elevated levels of
mercury. Mercury is a toxic contaminant that can cause neurological
damage. Julie Halpert filed this report about the harms mercury can
cause:


Three years ago, when she was 18, Ayla Brown was healthy, but
suddenly, she started getting sick all the time. She was always tired, she
became anemic and had sore throats. Her tonsils had deteriorated so
much that they had to be removed. Her doctor couldn’t figure out why,
so he decided to test her for heavy metals poisoning.


The result? Ayla’s mercury levels were off the charts. They were five
times higher than the normal level. Her entire family was tested and
their levels also were above normal.


“The only conclusion we could come to is that in the past year or so since
we had moved to Ann Arbor, we had started eating a lot of fish and a lot
of fish that we now know is very known to be high in mercury, such as
swordfish and tuna and stuff like that.”


The Browns ate several meals of fish every week. Some of it was
ocean fish. Some of it was Great Lakes fish. After the diagnosis, they
cut fish out of their diet altogether. Within a year, the mercury levels
returned to normal.


“You are trying so hard to eat healthy and my family always was very
health conscious and so it’s so frustrating when you’ve done something
that you thought was good for you and realize that it was completely the
wrong thing.”


Fish are generally considered part of a healthy diet, but not all fish are
entirely safe. That’s because of mercury. Mercury exists naturally in the
environment at low levels, but higher amounts are getting into the food
chain.


Coal-burning power plants emit mercury, which eventually settles into
the Great Lakes. Then, aquatic microorganisms convert the substance
into methyl mercury, which is more toxic.


Those microorganisms form the base of the food chain. Small fish eat
microorganisms. Then, larger fish eat the smaller ones. As that happens,
the mercury concentrations escalate, making big large mouth fish like
trout, salmon and some walleye especially contaminated.


When people eat the fish, the mercury is passed on to them. Women of
childbearing age and their fetuses are most at risk.


Michael Carvan is with the University of Wisconsin-Milwaukee’s Great
Lakes Water Institute. He says the exposure isn’t just from the fish that
women eat while they’re pregnant. A woman can pass her entire lifetime
load of mercury to her baby. He says that 15% of all women of
childbearing age have high enough levels so that their fetuses will
contain mercury of one part per million or higher.


“Even at really low levels, around one part per million, you’re talking
about some subtle coordination difficulties, you’re talking about
problems with memory and problems with neuro-processing and IQ
deficits.”


Because of these concerns, the Environmental Protection Agency and
the Food and Drug Administration issued an advisory for women of
childbearing age and children, suggesting they eat fish and shellfish only
twice a week.


But one expert is concerned by all this talk about how mercury harms
people. John Dellinger was on a task force, which provided guidance on
fish consumption advisories. Dellinger studied people who lived on
Lake Superior who he thought would eat a lot of fish, but he found
something else.


“We basically discovered that from an epidemiologic point of view, these
populations have other things that are adversely affecting their health,
that in fact will probably overshadow anything we’re going to see from
the contaminants in their fish.”


Dellinger said the people were so concerned about contaminants in
fish, that they started relying on store-bought, processed food instead.
Those foods were higher in fat and sugar and contained other, less
healthful, ingredients. So, obesity and diabetes caused health problems,
not mercury poisoning, and Dellinger says that ended up being a worse
situation.


He says the key is to choose wisely, avoiding fish such as swordfish,
tuna steaks and the larger predator Great Lakes fish that are high in
mercury. That’s the only measure you can take right now, but that doesn’t
solve the problem. The real challenge will be to get rid of the mercury
that ends up contaminating the fish.


For the GLRC, I’m Julie Halpert.

Related Links

Ten Threats: Break in the Food Chain?

  • Diporeia are disappearing from Lakes Michigan, Huron, Erie, and Ontario. The actual size of a diporeia is ½ an inch. (Courtesy of the EPA)

Some of the life in the Great Lakes has been hit hard by industry and trade. Pollution and
invasive species have hurt some of the native plants and animals important to the food
chain. While popular game fish might be the first to come to mind, it’s a little organism
at the bottom of the food chain that has biologists and fishing experts most concerned.
The Great Lakes Radio Consortium’s Lester Graham reports:

Transcript

In a survey, experts said one of the Ten Threats to the Great Lakes is a disappearing
species. Some native fish populations and organisms are declining. Our guide through
the Ten Threats series is Lester Graham.


Some of the life in the Great Lakes has been hit hard by industry and trade. Pollution and
invasive species have hurt some of the native plants and animals important to the food
chain. While popular game fish might be the first to come to mind, it’s a little organism
at the bottom of the food chain that has biologists and fishing experts most concerned.
The Great Lakes Radio Consortium’s Lester Graham reports:


(Sound of swinging doors)


Jack Donlan is taking me behind the fish counter at Donlan’s Fish House. In the
backroom he’s scaling and filleting some whitefish.


“Of the fishes caught in the Great Lakes, whitefish is one of the big volume fishes. Lake
perch, walleye bring more money per pound, but I would think from a tonnage-wise,
whitefish, it’s an extremely popular fish.”


This is a popular place to get Great Lakes fish, but Donlan’s suppliers, the commercial
fishers, are worried about the catch. At some places in the Great Lakes whitefish aren’t
doing too well.


(Sound of Lake Guardian motors)


Tom Nalepa is trying to figure out why whitefish are struggling. He’s onboard the U.S.
Environmental Protection Agency research ship, the Lake Guardian. Nalepa is a
biologist with the National Oceanic and Atmospheric Administration’s Great Lakes
Environmental Research Lab. He’s been studying Lakes Michigan and Huron, and on
this day he’s getting ready to study the bottom of Lake Erie.


He’s not studying whitefish. He’s actually looking for a tiny shrimp-like crustacean, only an
eighth to a quarter inch long, called diporeia. Eighty-percent of the whitefish diet is
made up of diporeia.


“And what we’re seeing is a dramatic drop in populations, and not only drops, but there are
large areas now in all the lakes, except Lake Superior, that no longer have diporeia. This
is real concern because diporeia is a very important fish food.”


Researchers used to find eight to 10-thousand diporeia or more in a square meter of sediment just
a few years ago. Now, there are only a dozen or so, or none at all. Diporeia is one of the
mainstays of the bottom of the food chain, and Nalepa says whitefish aren’t the only ones
that eat the tiny critters in the sediment at the bottom of the lakes.


“Just about every type of species found in the Great Lakes will feed on diporeia at some
stage in its life-cycle. Diporeia is high in calories and has a high-energy content. It’s a
very good food, nutritious food source for fish.”


Without it, fish are not getting enough to eat. Marc Gaden is with the Great Lakes
Fishery Commission. He says when diporeia disappears, commercial fishers can’t help
but notice.


“Right now we’re seeing skinnier whitefish. Whitefish that are somewhat emaciated in
some areas because they just don’t have as much of these low-end of the food web organisms
to eat, and we think it’s related to an invasive species that came in.”


That invasive species is the zebra mussel, and more recently another invader that was
likely carried to the lakes in the ballasts of ocean-going cargo ships, the quagga mussels.


Back on the Lake Guardian, Tom Nalepa says he’s seen the connection again and again.


“There’s no question that it’s related to zebra mussels and quagga mussels. In every area
that we’ve studied, regardless of the lake area, declines were happening a couple of years
after the quagga mussel or zebra mussel were first found, but that connection remains
elusive.”


Biologists thought the invasive mussels might have been filtering out all of the food the
diporeia eat, but when they find diporeia, they don’t appear to be starving. They appear
healthy. Now, scientists are wondering if there’s some kind of disease or toxin spread
by the mussels that’s wiping out the diporeia.


Even if researchers learn why the diporeia are disappearing, there might be nothing that
can be done to help. Some scientists worry that the decline of diporeia and other
organisms at the base of the food chain might ultimately lead to a massive collapse of fish
stocks in the Great Lakes.


For the GLRC, this is Lester Graham.

Related Links

Ten Threats: Coaster Brook Trout

  • A close up look at a Coaster Brook trout. (Courtesy of the Wisconsin Department of Natural Resources)

A lot of native fish have been hurt by pollution, invasive species and changes we’ve
made on the lake, but one fish stands out. For anglers, the Coaster Brook trout might have
been the greatest Great Lakes fish. It was abundant, fun to catch and lived in the cleanest
water, but throughout the 20th century, its populations declined just as the health of the
lakes did. Now, slowly, a diverse group of people is trying to save the fish in an effort
that could improve the Great Lakes too. The Great Lakes Radio Consortium’s Chris
McCarus reports:

Transcript

We’re continuing our look at Ten Threats to the Great Lakes. Lester Graham is the
series guide. He says one of the threats is a disappearing species.


A lot of native fish have been hurt by pollution, invasive species and changes we’ve
made on the lake, but one fish stands out. For anglers, the coaster brook trout might have
been the greatest Great Lakes fish. It was abundant, fun to catch and lived in the cleanest
water, but throughout the 20th century, its populations declined just as the health of the
lakes did. Now, slowly, a diverse group of people is trying to save the fish in an effort
that could improve the Great Lakes too. The Great Lakes Radio Consortium’s Chris
McCarus reports:


(Sound of river waterfall)


Hundreds of feet above Lake Superior, the Salmon Trout River flows fast and falls hard
onto a rocky bottom below. Much of the river lies within a large tract of private woods
and hills. It’s been untouched for about a century.


Peter Dykema and his family are part owners of the land. He speaks with affection about
fishing for coaster brook trout here as a kid.


“Well as you can tell it’s a beautiful river and there’s nothing a 14 year old boy would
rather do than get his feet cold and wet and throw flies into trees. So, I did it every
chance I had.”


Dykema is nostalgic because those days are long gone for almost everybody. He’s part
of a group of activists trying to restore the coaster brook population.


Coaster brook trout have sparkling colors. They’re even more colorful than Rainbow
trout, and they grow a lot bigger. They can reach 2 feet and 4 pounds. These indigenous
fish used to live in 200 streams around Lake Superior. People came from all around the
nation to fish for them. Presidents Roosevelt and McKinley came to Michigan to catch
them, and they were caught by the boatload.


Over fishing was one of the biggest reasons why they were nearly wiped out. Their
habitat was damaged from mining and road building. Silt filled in the rock bottom where
they like to lay their eggs. That also hurt the fish.


Logging damaged the coaster brook’s habitat. Scott Libants is a fish and wildlife
researcher at Michigan State University. He says loggers dammed up streams to flood
them. Then they packed them with logs. When they had enough, they broke the streams
back open so the logs would float down to the lake to be sold.


“You knock the dam out and send all the trees down. You scour the watershed. It’s like
flushing a toilet.”


The fish haven’t recovered since. They just couldn’t take the abuse.


The Salmon Trout River still has them because the private landowners banned fishing
and didn’t alter the land. It’s one of only a handful of streams in the U.S. and Canada
that still has the coaster brook trout.


(Sound of people walking in the woods)


Downstream on the way to Lake Superior, Peter Dykema and state environmental
officials walk to the spot where they have equipment that counts the numbers of coaster
brooks going up river to lay their eggs. Dykema says they counted more than 80 fish last
season. The population seems to be slowly increasing here, but the stream still isn’t
perfect. There’s too much sand and not enough gravel for laying eggs.


“Most of the sediment problem we are looking at is a creature of the last 40 or 50 years.
So if we can stop the input, I’m hoping that the river will be able to cleanse itself.


The sediment Dykema is talking about comes from the points where roads cross the river.
People and cars jar soil loose and it fills up the riverbed. This is the fish’s current
challenge. Coaster brook trout are sensitive and susceptible to pollution. Conservation
officials use brook trout as indicators of high water quality. Coaster brooks will die if
they don’t have nearly perfect conditions.


(Sound of Lake superior waves lapping on rocks.)


Few anglers alive today have seen coaster brook trout, but if they could this would be the
place. It’s where the Salmon Trout River meets Lake Superior. For a diverse group of
conservationists, this place symbolizes what people did to the land and water of the
region.


Laura Hewitt is visiting from Trout Unlimited in Wisconsin.


“This is a fish that presidents came to fish for, that Hemingway wrote about. It’s
something that captures the imagination, it touches the soul. It’s a fish that we care
very much about and think it can be sort of a rallying point for action in the basin.”


Those working to preserve the last few hundred coaster brook trout say we should feel
lucky that they’re not all gone. They say now’s the time to keep what’s left, build it up,
and use the eggs from this small population to start the fish in other streams of Lake
Superior. Then perhaps within our lifetime, our children can enjoy the fish that our great
grandfathers did, and in doing that, they’ll know the water’s clean.


For the GLRC, I’m Chris McCarus.

Related Links

Investigation Uncovers Bombing Site

An investigation has found that the Air Force used the
Apostle Islands and Lake Superior for bombing practice in the early 1970’s. The Great Lakes Radio Consortium’s Mike Simonson has the story:

Transcript

An investigation has found that the Air Force used the Apostle Islands and Lake
Superior for bombing practice in the early 1970’s. The Great Lakes Radio
Consortium’s Mike Simonson has the story:


Jim Erickson was hoping to pull in a net full of fish one afternoon thirty years
ago, but his catch had a surprise. The Bayfield, Wisconsin fisherman had
snagged a missile.


“It was about four feet long and had some fins on it. They used to run those runs
outside of Outer Island there during the summer. Target practice, I guess.”


Erickson strapped the missile to the top of his fishing boat and tooled back to
Bayfield, where he handed it over to the Coast Guard. Erickson says he’s not
sure if the missile was a dummy or had live ammo. That’s one missile of three he
knows of that local fisherman pulled in around the Apostle Islands.


An investigation by the nearby Red Cliff tribe uncovered Erickson’s story. The
U.S. Department of Defense paid for that investigation. It is uncovering evidence
of different uses by the military of Lake Superior, including dumping tons of
ammunition after World War II.


For the GLRC, I’m Mike Simonson.

Ten Threats: Canals Past and Present

  • This is an ocean vessel in the Soo Locks, Sault Ste. Marie, Michigan. The Soo Locks connect Lake Superior and Lake Huron, allowing for ships to travel back and forth. (Photo courtesy of EPA)

One of the Ten Threats to the Great Lakes identified by experts across the region is the possible
expansion of canals to allow larger ocean-going ships into the lakes. Some see the expansion of
shipping channels as a threat to the environment; others see it as great economic opportunity.
Just like in the early days of settlement, they see the shipping channels on the Great Lakes as
a way to make trade opportunities better.

Transcript

In our next report from the series, “Ten Threats to the Great Lakes,”
Lester Graham brings us a look at shipping on the lakes. Some people think
bigger ships could bring more trade to the region:


One of the Ten Threats to the Great Lakes identified by experts across the region is the possible
expansion of canals to allow larger ocean-going ships into the lakes. Some see the expansion of
shipping channels as a threat to the environment; others see it as great economic opportunity.
Just like in the early days of settlement, they see the shipping channels on the Great Lakes as
a way to make trade opportunities better.


Native Americans had canoe trade routes on the Great Lakes long before the Europeans appeared
on the scene. When French fur traders arrived, they copied what they saw. They built birch-bark
canoes to travel the lakes and to haul back fur pelts.


(Sound of Saginaw Voyageurs paddling and singing “Alouette, gentile Alouette…”)


Chuck Hoover is with the Saginaw Voyageurs, a group of re-enactors who re-trace the French
Voyageurs routes. Hoover says the large canoes were great until you ran into rapids on the rivers
connecting the lakes.


“What you had to do was pick up everything, including the boat, and carry it across the dry land to
the next place that you could put in water that was navigable.”


Those portages could be as long as seven miles. Carrying a canoe big enough to haul more than a
dozen men and the heavy bundles of fur pelts was a tough job and it slowed trade. So, some small
canals were dug to make passage easier. As the region developed even more valuable natural
resources were discovered. Bigger canals were needed.


Stanley Jacek is an Area Engineer with the U.S. Army Corps of Engineers at the canal and locks
at Sault Ste. Marie, Michigan. He says by the middle of the 1800s mining around Lake Superior
had become big business.


“Back in those days they discovered iron ore and copper in the upper end of the lakes here. So,
they had to get all that commerce down to the heartland of the country, so locks had to be
built.”


With a canal and locks to help ships negotiate the drop from one lake level to the next, the ore
could be transported to the big steel mills in industrial cities such as Cleveland and Gary, Indiana.


Christopher Gilchrist is with the Great Lakes Historical Society. He says you can’t underestimate
the value of those canals.


“The water-borne transportation was critical for the creation of the industrial age in U.S. history.
There’s a reason why the steel mills are located right on the banks of these Great Lakes. All the major
steel mills were located right by the water so that they could get their raw materials cost
effectively.”


At the other end of the Great Lakes the St. Lawrence Seaway opened in the 1950s to make it
possible for ships on the Atlantic Ocean to enter the lakes, and another big canal and set of
several locks overcame another obstacle to shipping on the Great Lakes – The Niagara Falls.


The Welland canal allows ships to go around Niagara. Since it first opened in the 19th century the
Welland canal and its locks have been enlarged four times. Each time the Welland canal locks
and the St. Lawrence Seaway have been made wider and deeper, the shipping industry builds
bigger and bigger ships to the point that they literally just squeak through…


(Sound of ship squeaking against timbers)


…Often rubbing up against the timbers that act as bumpers on the locks’ concrete walls.


Throughout the history of the canals, there’s been pressure to make them bigger and bigger.
Many feel the amount of shipping through the canals is tied directly to the economic well being
of the nation. The more the canals can handle the better the economy.


(Sound of buzzing, roar of compressor)


Back at Sault Ste. Marie, the locks open to allow another big ship through.


Stanley Jacek, the engineer at the Soo Locks connecting Lakes Superior and Huron says the
economic impact is pretty easy to track.


“What we do here in the way of passing of commerce mimics what’s happening in the country. You
can actually see spikes in the economy by looking at our traffic here.”


But some say the canals could do more than just reflect the health of the economy. They could
spur the economy if even bigger ships could come into the lakes. The ships, the kind carrying
containers ready to be pulled by trucks or loaded on rail cars, could go directly to Great Lakes
ports instead of ports on the East or West coasts. More direct shipping might improve the
region’s economy.


But environmentalists are worried. They say bigger ships from all over the world might mean
more alien invasive species damaging the Great Lakes. The wider, deeper channels might
damage the environment along scenic rivers connecting the lakes, and some believe expanding
the channels will let too much water flow out of the lakes that could worsen the problem of lower
lake levels seen in recent years.


The plans for bigger ships are on hold for right now. But, given the history of the canals, many
believe expansion is only a matter of time.


For the GLRC, this is Lester Graham.

Related Links

Ten Threats: Luring the Lamprey

  • The sea lamprey, up close. (Photo courtesy of USFWS)

One of the Ten Threats to the Great Lakes is the decline of many of the native species. The lake trout has been in trouble from over-fishing and because of an invasive species called, the sea lamprey. Conservation agents use a pesticide to keep the lamprey down, but it’s expensive, and sometimes it kills other fish. Now, researchers have discovered a lamprey pheromone that could help the fight against the sea lamprey. Stephanie Hemphill has that story:

Transcript

In our next report in the series Ten Threats to the Great Lakes we hear about how a native
fish has been hurt by an invasive species that swam into the lakes through a canal. Lester
Graham is our guide through the series.


One of the Ten Threats to the Great Lakes is the decline of many of the native species.
The lake trout has been in trouble from over-fishing and because of an invasive species
called, the sea lamprey. Ever since it invaded the Great Lakes, scientists have been trying
to keep the invasive sea lamprey under control.


Conservation agents use a pesticide to keep the lamprey numbers down, but it’s expensive,
and sometimes it kills other fish. Now, researchers have discovered a lamprey
pheromone. They think the chemical attractant could be a big help in their fight against
one of the most destructive invasive species in the Great Lakes. Stephanie Hemphill
has that story:


The sea lamprey came into the Great Lakes through canals more than a hundred years
ago. The slimy parasites attach themselves to big fish and feed on them until they die.
Each lamprey can kill 40 pounds of fish in its lifetime.


Between sea lampreys and over-fishing, the big native fish, the Lake Trout, was wiped out
in the lower Great Lakes. Only a few survived in small pockets in Lake Huron. Lake
Superior is the only place Lake Trout survive in healthy numbers.


There’s an aggressive 15-million dollar a year program to keep sea lamprey numbers
down. Part of the effort is using a chemical called TFM that kills the lamprey.
Wildlife managers spread the lampricide in streams in the spring. It kills some of the
young lamprey as they swim down into the lake.


University of Minnesota biologist Peter Sorensen says he and other scientists noticed that
TFM kills not just the juveniles, but the larvae that live in the streambed too. They also
realized, after a stream is treated, very few adult lamprey come back to the stream to
spawn, or lay new eggs.


“And this led to an observation decades ago, which was key, that adult lamprey must be
selective in how they pick streams. They only pick a few, and if you remove the larvae
they don’t seem to go in there.”


Scientists suspected the larvae might play a role in the spawning migration of adults.
That might mean the larvae are putting out a pheromone that tells the adults it’s a good
place to spawn. Just one larva attracts a lot of adult lamprey, indicating the pheromone
is very potent.


It was up to Jared Fine to determine what the chemical is. Fine is a PhD student working
with Peter Sorensen. For two years he sifted through the water in tanks holding lamprey
larvae.


“Separating the different chemical compounds, testing them biologically, seeing which
ones have activity, coming back to the active ones, further separating them, and just
repeating this until you get down to the one or two or three compounds that have the
activity.”


Fine narrowed it down to three compounds. He purified them and gave them to a colleague in the chemistry department, Thomas Hoye. Hoye created a synthetic version of the most potent pheromone. He says it should be possible to produce it on a large scale, and that means it could be used to treat the
Great Lakes. The question is, how much would he need?


“You know, would it be a tank car load, would it be a football field, would it be a dump
truck? It’s none of those. Would it be a barrel? No. Is it a bucket-full? No. In
fact it’s only about 500 grams, that’s just one pound, would treat all that water for a
month.”


And that’s all it would take, because the lamprey only spawn for a month, but the
treatment would have to happen once a year. Peter Sorensen says when lamprey
approach a stream to spawn, their clock is ticking. They have a powerful urge to lay
eggs, and once they’ve done that, they die.


“They are driven animals. Frankly they’re kind of on autopilot and pheromones are
what’s driving that autopilot to a very large extent, and now that we’ve got it, I think we
can really powerfully use that to our advantage.”


Sorensen says fisheries managers could use the pheromone to attract more lampreys to
streams outfitted with traps.


“You know the key here is the fact that this pheromone is natural, safe, and should be
very inexpensive to add.”


Fisheries managers hope the pheromone will help reduce the cost of controlling the
lamprey and add a new weapon to their arsenal.


The news on lamprey couldn’t have come at a better time for wildlife managers
around Lake Superior. After years of relatively constant numbers, the lamprey
population jumped dramatically this year. Scientists say lamprey may be finding new
spawning grounds in the mouths of streams, where lampricide is less effective. They’re
hoping they can use the pheromone to draw the lamprey to traps further upstream.


For the GLRC, I’m Stephanie Hemphill.

Related Links

No Commercial Dives Allowed on Fitzgerald

  • The Edmund Fitzgerald sank just off Whitefish Point in Lake Superior. Diving to the site has now become controversial. (Photo by John Allen)

The doomed ore carrier Edmund Fitzgerald lies in the Canadian waters of eastern Lake Superior. Now, the Ontario government is strongly discouraging expeditions to the shipwreck. The Great Lakes Radio Consortium’s Mike Simonson reports from Superior:

Transcript

The doomed ore carrier Edmund Fitzgerald lies in the Canadian waters of eastern Lake Superior. Now,

the Ontario government is making expeditions to the shipwreck off-limits. The Great Lakes Radio

Consortium’s Mike Simonson reports from Superior.


Twenty-nine men were lost in hurricane-force winds November 10th, 1975 in Lake Superior. For years,

families of the crew have asked that the ship be left alone. None of the bodies were recovered and

are believed to be in or around the ship.


Ministry Spokesman Guy LePage doubts they’ll grant any more permits for expeditions to anyone.


“Given that the tragedy didn’t happen all that long ago and there are living next of kin, we’ve not

supported diving on the wreck.”


Even though this is the 30th anniversary of the loss of the Edmund Fitzgerald, LePage says no one

has applied for an expedition permit.


For the GLRC, I’m Mike Simonson.

Related Links

Luring an Invasive Fish With Pheromones

A scientist has discovered a chemical compound that attracts
an invasive fish. The Great Lakes Radio Consortium’s Mike Simonson
reports that this could be a breakthrough in controlling harmful fish
populations:

Transcript

A scientist has discovered a chemical compound that attracts an invasive fish. The
Great Lakes
Radio Consortium’s Mike Simonson reports that this could be a break through in
controlling
harmful fish populations:


Eurasian ruffe were introduced in the Duluth-Superior harbor from ballast water of
ocean-going
ships in the 1990’s. Ruffe reproduced so quickly, they now make up 80 to
90-percent of the fish
population, squeezing out native fish. Now, they’re spreading eastward across Lake
Superior
toward the lower Great Lakes.


University of Minnesota Fisheries Professor Peter Sorenson says he’s isolated a
pheromone that
will cause the fish to cluster in great numbers of male ruffe who are tricked into
thinking it’s time
to mate.


“It causes a great deal of sexual arousal and excitement. So to help detect this
thing, I suppose
like a dog they get a little crazy and just start swimming around like crazy and
nudging and
inspecting the fish in the tank.”


Once they’re clustered, Sorenson says it may be possible to find a way to cut their
population.
Sorenson hopes to find a similar pheromone in carp and sea lamprey, other invasive
species
which threaten native fish in the Great Lakes.


For the Great Lakes Radio Consortium, I’m Mike Simonson.

Related Links

A Second ‘Hot Spot’ Considered for Cleanup

It looks as though a second pollution hot spot in the Great Lakes
will receive money for cleanup. The Great Lakes Radio Consortium’s
Mike Simonson reports on the progress of the Great Lakes Legacy Act:

Transcript

It looks as though a second pollution hot spot in the Great Lakes will receive money
for cleanup.
The Great Lakes Radio Consortium’s Mike Simonson reports on the progress of the
Great Lakes
Legacy Act:


The Great Lakes Legacy Act was passed in 2002. It earmarked 54 million dollars a
year for five
years to clean up pollution hot spots. In the first several years, not all the
money promised was
delivered. So clean up on the 31 polluted areas has been slow.


Right now, the Black Lagoon on the Detroit River is the only pollution hot spot
being cleaned
up. Officials from the U.S. Environmental Protection Agency say they’re hoping to
start on a
second project in Lake Superior next year.


Wisconsin will need to pony up a third of the 5.2 million dollar cost to dredge the
sediments in
Superior Harbor. Wisconsin Project Supervisor John Robinson is hopeful. He says
two decades
after identifying the pollution, money may finally be available.


“The Legacy Act is clearly a catalyst that will allow us to go ahead. Without it,
the project
would be delayed into a period of time that we’re uncertain of.”


Some of the money will come from companies partly responsible for the pollution.
Robinson
hopes to begin cleanup in February.


For the Great Lakes Radio Consortium, I’m Mike Simonson.

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Commercial Fishers Angling for Trout Fishing Rights

  • Steve Dahl is one of about 25 commercial fishers on the North Shore of Lake Superior. Dahl makes a modest living selling herring, but he'd like to be able to fish for lake trout too. When he's fishing for herring, Dahl pulls his gill net up and passes it across his boat, plucking herring from the mesh. (Photo by Stephanie Hemphill)

Some fish populations in the Great Lakes have recovered dramatically from the devastating pollution of the last century. But the very health of the fishery presents a new set of challenges for people. Who gets to catch the fish? Most states favor sport anglers, but some commercial fishing operations are asking for a bigger share. The Great Lakes Radio Consortium’s Stephanie Hemphill reports:

Transcript

Some fish populations in the Great Lakes have recovered dramatically from the
devastating pollution of the last century. But the very health of the fishery presents a
new set of challenges for people. Who gets to catch the fish? Most states favor sport
anglers, but some commercial fishing operations are asking for a bigger share. The Great
Lakes Radio Consortium’s Stephanie Hemphill reports:


(sound: engine zooms, slows)


Steve Dahl guides his aluminum boat to his gill net, anchored below the waves of Lake
Superior. He fishes out of Knife River, a small town just up the shore from Duluth
Minnesota. A few feet at a time, the net offers up its catch – slender silver herring
caught by the gills.


“The mesh actually has a little bit of flex to it. That’s why I can squeeze them out. One
that’s too big or fat, you have to back it out, so you don’t harm the flesh.”


The openings in the net are just right to catch herring. Too small for lake trout. Dahl
isn’t allowed to catch lake trout anyway. He says they mostly just bounce off the net.


When the net is empty, about 40 herring – each of them about a pound – are lying in a tub
at the bottom of the boat.


Dahl is working hard for these fish. It’s pretty cold, and the wind is gusting.


(ambient sound)


Dahl says sometimes the current is so strong, he can’t pull the net up out of the water.
Sometimes there are no fish in the net. In the
summer, they move around and they’re hard to find. And of course, he can’t fish when
the lake is frozen.


But he loves this life.


“I get to be outside all the time, my own boss. It’s great fun.”


Steve Dahl sells his catch to the restaurants and fish houses that dot the North Shore of
Lake Superior. He makes his living this way. He says he doesn’t make a lot of money,
but it’s a good life.


Dahl says the money would be better if he were allowed to fish for lake trout. He figures
he’d be able to make several thousand dollars more a year if he could catch even just a
few hundred lake trout.


“That’s all we’re asking for is to be able to supply the local restaurants through the peak
tourist season.”


Lake trout were almost wiped out by over-fishing and by the parasitic sea lamprey in the
1960’s and 70’s. The lamprey are under control now, and decades of stocking lake trout
have brought the population back up. People who fish for sport have been catching more
and more lake trout. Last year, they caught about 15,000 of the fish on the Minnesota
side of Lake Superior. But so far the state of Minnesota won’t allow commercial fishers
to go after them. Neither will Michigan, although Wisconsin and Ontario do.


Don Schreiner manages the Lake Superior fishery for Minnesota. He says restoring the
lake trout population is taking a long time. That’s why they don’t want to open it up to
commercial fishing just yet.


“Right now we’re pretty cautious, we’ve just started kinda pulling back on stocking and it
seems a little premature to start thinking about opening the door for commercial
fisheries.”


Next year, Minnesota plans to create a new ten-year plan for the fish in its Lake Superior
waters. Don Schreiner says during the planning process, everyone will be able to have
their say. But sport anglers far outnumber the two dozen or so commercial fishermen on
the North Shore. So they’ll need to find allies in their claim on the lake trout.


Paul Bergman is likely to speak up in favor of commercial fishing for lake trout. He
owns the Vanilla Bean Bakery & Café in Two Harbors, Minnesota. He buys herring from
Steve Dahl. He says half his customers order fish, and they love it when it’s locally
caught.


“People really do come up here for the native fish on the North Shore, so we’re getting so
many more repeat customers now from the cities. More and more are asking for the fish.”


Bergman puts a sign in the window when he has fresh herring, and he says it pulls people
in. He’d like to be able to do the same with lake trout.


For the Great Lakes Radio Consortium, I’m Stephanie Hemphill.

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