A class of potentially toxic chemicals, known as PBDEs, is being found in higher levels in people in North America. The chemicals are used to prevent fires in everything from couch cushions to televisions. The Great Lakes Radio Consortium’s Mark Brush has more:
Transcript
A class of potentially toxic chemicals, known as PBDE’s, is being found in
higher levels in people in North America. The chemicals are used to prevent
fires in everything from couch cushions to televisions. The Great Lakes
Radio Consortium’s Mark Brush has more:
PBDE’s are used extensively throughout North America. In Europe and Asia
the chemicals are hardly used at all for this purpose. To date, four studies have
indicated that North Americans have considerably higher levels of the
chemicals in their bodies, than do Europeans and Asians. The most recent
study tested the breast milk of 47 women in Texas.
Linda Birnbaum co-authored the study published in the journal Environmental Health
Perspectives. She says while these chemicals were created to save lives,
other chemicals should be developed that won’t be absorbed by human tissue:
“Personally I’m concerned about chemicals that persist and bio-accumulate.
They eventually get to a point be that they can be a problem.”
Some animal tests have shown that the chemicals can be toxic. That’s why the
European Union and the state of California enacted a ban on certain types of PBDE’s.
For the Great Lakes Radio Consortium, I’m Mark Brush.
Tens of millions of gallons of untreated or partially treated sewage were dumped into the Great Lakes basin during last month’s massive power outage, but environmentalists say that’s a drop in the bucket compared with the overall problem of contamination from sewage spills. The Great Lakes Radio Consortium’s Sarah Hulett reports:
Transcript
Tens of millions of gallons of untreated or partially treated sewage were dumped into the Great
Lakes basin during last month’s massive power outage. But environmentalists say that’s a drop
in the bucket compared with the overall problem of contamination from sewage spills. The Great
Lakes Radio Consortium’s Sarah Hulett reports:
Environmental groups say a heavy rain can easily send more raw sewage into lakes and streams
than an event like last month’s blackout.
In Michigan alone, officials say 57 million gallons of sewage were dumped because of the
blackout. Environmentalists say that’s not much, compared to the 50 billion gallons the state
dumps yearly.
Bethany Renfer is with Clean Water Action.
“I think we need to look at all steps that we can take to help to reduce the overflows – both those
that are happening in extenuating circumstances, like a blackout – but also those that are regularly
occurring…that we can almost plan for.”
The blackout strained wastewater treatment facilities from Michigan to New York. All told, at
least 550 million gallons were dumped into lakes, harbors, and streams.
For the Great Lakes Radio Consortium, I’m Sarah Hulett.
A new study indicates that more children might be at risk from the effects of lead in their environment than previously thought. The Great Lakes Radio Consortium’s Mark Brush has more:
Transcript
A new study indicates that more children might be at risk from the effects of lead in their
environment than previously estimated. The Great Lakes Radio Consortium’s Mark Brush has
more:
Elevated levels of lead in a child’s bloodstream are known to cause mental development
problems. The question is…how much lead is too much? Today, the danger level is set at 10
micrograms per deciliter of blood. But new research published in the New England Journal of
Medicine shows that levels below ten micrograms might also cause problems. Richard Canfield
is a researcher at Cornell University. He headed up the latest study:
“Instead of finding that as lead levels increase the power of lead to cause
problems increases, which most people would think, we found that most of the
damage seems to be done at the low levels.”
Canfield and his group found that IQ levels in young children dropped even at lead levels below
the current standard. He notes that, on the whole, the problem of lead poisoning in children is
decreasing, but it’s still a major concern.
For the Great Lakes Radio Consortium, I’m Mark Brush.
Children are typically exposed to lead in older homes with lead based paint or lead in the home’s
piping system, and by playing in soil next to roadways contaminated by cars that burned leaded
gasoline in the past. To find out more about lead poisoning visit the Center’s for
Disease Control’s website at www.cdc.gov.
NorthShore Mining Company now operates the former Reserve Mine and Taconite Plant. Waste rock is deposited on land a few miles from Lake Superior. Questions remain about whether taconite fibers pose a human health risk. (Photo courtesy Cleveland Cliffs)
This electron microscope photo shows a taconite fiber breaking up into smaller fibers in rat lung tissue. (Photo courtesy Dr. Philip Cook)
Researchers are trying to determine whether fibers found in taconite mined near Lake Superior might cause cancer. Taconite is a type of iron ore. The microscopic fibers found in some taconite rock are a lot like asbestos, and asbestos causes cancer and other serious lung diseases. Research is now underway that could determine whether the fibers in taconite can cause cancer too. The question is a classic example of the uneasy balance between protecting health and creating jobs. The Great Lakes Radio Consortium’s Stephanie Hemphill reports:
Transcript
Researchers are trying to determine whether fibers found in taconite mined near Lake Superior
might cause cancer. Taconite is a type of iron ore. The microscopic fibers found in some
taconite rock are a lot like asbestos, and asbestos causes cancer and other serious lung diseases.
Research is now underway that could determine whether the fibers in taconite can cause cancer
too. The question is a classic example of the uneasy balance between protecting health and
creating jobs. The Great Lakes Radio Consortium’s Stephanie Hemphill reports:
The fibers in taconite first made big news thirty years ago. Reserve Mining Company was
dumping its waste rock in Lake Superior, and the fibers turned up in Duluth’s drinking water.
People worried, and started drinking bottled water, until a special filtration plant was built.
Reserve was forced to dump its waste rock on land.
But the jury is still out on whether the fibers are dangerous.
Phil Cook is one of the people who discovered the fibers in the water supply. He’s a chemist at
the National Water Quality Lab in Duluth. He studied the fibers for years.
They’re so small, you can’t see them even with a regular microscope. Cook and his team had to
use an electron microscope to get a handle on the fibers.
“Hundreds of hours of looking at many fields of view and counting particles of all sizes and
shapes and identifying them specifically as to what their mineral nature was.”
Some of the taconite fibers turned out to be more cancer-causing than others. The most
commonly occurring fibers were less dangerous.
But Cook found that some of the fibers caused even more cancer than asbestos. After two years
of experiments on lab rats, Cook found the most dangerous taconite fibers had splintered off,
multiplying the number of fibers in the rats lungs.
“So there was some kind of slow leaching going on while the fibers were in tissue, and blocky
particles would become thinner fibers. So the number of fibers were increasing and the dose was
increasing.”
But the question is, does the same thing happen to people, and are people exposed to enough of
the fibers to worry about cancer?
NorthShore Mining Company currently operates the former Reserve mine and processing plant.
NorthShore monitors its fiber emissions. Millions of fibers pour from the smokestacks. But at
monitoring stations about a mile away, the numbers drop to a background level comparable to
cities out of the area.
But some people worry even that level could make people sick.
There are no national or state standards for fibers in the air.
There are some rules for workplaces. Miners and taconite workers are exposed to a lot more
fibers than people who live nearby.
Northeastern Minnesota has a much higher rate of mesothelioma than the rest of the state.
Mesothelioma is a rare form of lung cancer caused by asbestos. Some miners are concerned
taconite could cause mesothelioma too.
The state Health Department recently completed a study of taconite workers who died of
mesothelioma. The study found most of them were exposed to commercial asbestos used as
insulation as well as taconite dust. The study concluded the commercial asbestos was the most
likely cause of the miners’ disease.
But the study looked only for mesothelioma. Some miners say it should have looked for other
diseases too. David Trach is president of a Steelworker retiree group. He says 450 former mine
workers got x-rays, and 30% of them had some kind of lung abnormality. Only a very few of
them had mesothelioma.
“We’ve got to search out for those young miners that are working now so they don’t end up like
some of my friends did at LTV Steel that are in their 60s and 70s, and can hardly breathe.”
The Minnesota Health Department has file cabinets full of information about the health of miners
and taconite workers. But there’s no money to study the data looking for other lung diseases.
That’s because last year the Minnesota state legislature eliminated the money for the project.
There’s a lot riding on whether taconite fibers are safe. Officials in the area where NorthShore’s
plant is located, would like to use the plant’s waste rock to build roads, which would spread the
taconite fibers throughout the county. Until now the company has been prohibited from selling
its waste rock by the court ruling in the Reserve case.
Also, several companies have been prospecting in the region. New mines for copper, nickel, and
other minerals could provide much-needed jobs in a region hit by mine closures and cutbacks in
the taconite industry. But they could also be digging into the same rock where the taconite fibers
are found.
After the scientific studies are published, the Minnesota Health Department will conduct a
formal assessment of the risks – if any – of taconite fibers.
For the Great Lakes Radio Consortium, I’m Stephanie Hemphill in Duluth.
The Environmental Protection Agency has launched a wider probe into a chemical compound used to make Teflon-coated cookware and other well known products, such as Stainmaster, Scotchgard and Gore-Tex. The chemical is known as C8, and it’s manufactured by DuPont. It’s been found in the air and water across the country. Now environmentalists are putting pressure on the EPA to ban it. The Great Lakes Radio Consortium’s Natalie Walston has more:
Transcript
The Environmental Protection Agency has launched a wider probe into a
chemical compound used to make Teflon-coated cookware and other well known
products, such as Stainmaster, Scotchgard and Gore-Tex. The chemical is
known as C8, and it’s manufactured by DuPont… It’s been found in the air
and water across the country. Now environmentalists are putting pressure on
the EPA to ban it. The Great Lakes Radio Consortium’s Natalie Walston has
more:
The EPA has launched the most extensive study yet to determine whether the
chemical C8 and similar families of chemicals cause reproductive and
developmental damage to women and girls. The 3-M company, which used to
manufacture C-8, has studied the effects of the chemical on lab rats. The
findings: rats exposed to the chemical lost weight. They experienced delayed
sexual maturation and their offspring commonly died prematurely.
DuPont company
scientist Robert Rikard, though, says the company has used C8 for more than
50-years. He says concerns about the chemical are unfounded. That’s even
though C8 belongs to a family of chemicals that some companies have stopped
manufacturing because of health concerns. 3-M stopped making its Scotchguard stain repellent
after finding one of the chemical compounds sticks around in the environment. It’s also
been found in the bloodstreams of people worldwide. The EPA doesn’t have guidelines in
place to regulate C8. And it could be months before there the agency finishes
its extensive study of the chemical compound.
For the Great Lakes Radio Consortium, I’m Natalie Walston.
The Coast Guard cutter Sundew was built in 1944
in Duluth as a "buoy tender." In 1979, the Coast Guard had the ship's hull reinforced and beefed up its engine so the ship could double as an icebreaker. Photo by Chris Julin.
Cargo ships are moving on the Great Lakes, but Coast Guard icebreakers are still on duty on the north side of the Lakes. The Coast Guard’s massive icebreaker, the “Mackinaw,” smashed ice from its home in Michigan all the way across Lake Superior to Duluth. And the Coast Guard cutter “Sundew” has been chipping away at the ice in Duluth for weeks. The Great Lakes Radio Consortium’s Chris Julin has this report:
Transcript
Cargo ships are moving on the Great Lakes, but Coast Guard icebreakers are still on duty on the
north side of the Lakes. The Coast Guard’s massive icebreaker, the “Mackinaw,” smashed ice
from its home in Michigan all the way across Lake Superior to Duluth. And the Coast Guard
cutter “Sundew” has been chipping away at the ice in Duluth for weeks. The Great Lakes Radio
Consortium’s Chris Julin has this report:
There’s a whiff of spring in the air in lots of places, but parts of Lake Superior are still covered
with ice. Cargo ships are leaving their berths where they spent the winter. But when the first
ships got ready to go, the ice on the Duluth Harbor was still two feet thick. That’s thick enough to
keep a ship locked in place.
The Coast Guard cutter Sundew carved a path through the ice so ships could leave.
(sound of chop, splash)
As the Sundew churns away, slabs of ice tip on edge under the bow. Each slab looks like the
floor of a single-car garage turned on edge. The Sundew will cut a swath several miles long, and
then come back along the same path. With each pass, the shipping lane gets a little bit wider.
Bev Havlik is the commanding officer on the Sundew.
“We’re taking out just little shaved bits of it at a time to make the ice chunks smaller. It’s like
sawing a log, just shaving off a bit of it at a time.”
“The Sundew wasn’t built as an icebreaker. It’s usual duty is tending buoys. The ship places, and
maintains about 200 navigational buoys on Lake Superior. But a couple decades ago, the Sundew
got some extra steel added to its hull, and a new, bigger engine. Since then, it’s done double duty
as an icebreaker.”
Commander Bev Havlik says the Sundew slices through thin ice like a butter knife. But in
thicker ice, like this stuff, the hull actually rides up on top of the ice and pushes down through it.
That’s why there are three mini-van-sized chunks of concrete on the ship’s deck. Each one weighs
12,000 pounds.
“It helps us bite into it with the bow, instead of riding up too high.” It keeps the weight down
forward more.”
A little bit like putting sandbags in the back of your pickup in the wintertime?
“It’s a similar sort of principle, right. It gives you the bite you need.”
Icebreaking is serious business. It gets ship traffic moving weeks before the ice melts. But
beyond that, Bev Havlik says it’s really fun.
“This is awesome. It’s the only job that I’d ever had where they pay us to come out and break
something.”
The Sundew is 180 feet long. That’s about the length of 10 canoes lined up end to end. It has
about 50 crew members. One of the junior crew members is usually at the wheel. The real
“driver” is an officer who’s standing 20 feet away, out on the deck through an open door. The
officer adjusts the ship’s speed, and calls out a steady stream of steering commands to the
“helmsman” — that’s the guy at the wheel.
(sound of Helsman)
“Right five-degrees rudder … steady as she goes, aye.”
Ensign Jason Frank is about to take his turn driving the Sundew. He wears a big rabbit fur hat
when he’s out on the deck driving the ship.
“We actually have face masks and goggles for when it really gets cold. It gets so cold out here
sometimes it feels like your eyes are going to freeze out, or something.”
(natural sound)
Jason Frank is halfway through his two-year stint on the Sundew. Then he’ll be stationed
somewhere else, and the Sundew will be removed from service. The ship was built in Duluth in
1944, and it’s retiring next year. Jason Frank wanted to work on the Sundew because aren’t many
ships like this still in service. On newer vessels, the officer driving the ship stands inside. And
here’s something right out of the movies – the Sundew has a big, brass steering wheel.
“Whereas with the new ships, most the new ships have just a little joystick. It’s very similar to
like a joystick you’d have maybe when you’re playing a computer game or something. All you
have to do is turn that joystick and the computer tells the rudder what to do. We’re actually
maneuvering the throttles, we’re actually driving. With the new ship, basically it has an
autopilot.”
The ice is melting in the Duluth Harbor, but it still clumps together on windy days and makes
trouble for ships. The Coast Guard cutter Sundew will stay on ice-breaking duty until the
weather warms up, and a good southwest wind pushes the rest of the ice out of the harbor into
Lake Superior.
For the Great Lakes Radio Consortium, this is Chris Julin.
The state legislature in Minnesota is looking at a bill that would restrict phosphorus levels in automatic-dishwashing detergents. Supporters say it would reduce harmful algae blooms in lakes and streams. If the bill passes, it would be the first state to make such restrictions. The Great Lakes Radio Consortium’s Christina Shockley reports:
Transcript
The state legislature in Minnesota is looking at a bill that would restrict phosphorus levels in
automatic-dishwashing detergents. Supporters say it would reduce harmful algae blooms in lakes
and streams. If the bill passes, it would be the first state to make such restrictions. The Great
Lakes Radio Consortium’s Christina Shockley reports:
Phosphorus in detergents helps to clean dishes, but when the mineral ends up in lakes and
streams, it promotes algae blooms. Large algae blooms can kill fish and restrict sunlight to
bottom-rooting plants. In the 1970s, phosphorus was restricted in other types of detergents.
David Mulla is a professor in the soil, water, and climate department at the University of
Minnesota. He says that legislation did make a difference.
“We had a very large reduction in the amount of phosphorus that was being emitted to our waste
water treatment plants as a result.”
However, Mulla says dishwashing detergents are not one of the primary sources of phosphorus in
lakes and streams today. Detergent manufacturers say if they don’t use phosphorus, their
detergents might not meet some health standards. They also say a reduction won’t have any
environmental benefits. The bill is currently being discussed in the state legislature.
For the Great Lakes Radio Consortium, I’m Christina Shockley.
Some people, because of culture or because of necessity, rely on fishing as a way to supply an important part of their family’s diet. While fish is healthful food, experts warn that fish from lakes and rivers can be contaminated by pollutants. In the first of a two-part series on communicating the risks of eating contaminated fish to ethnic groups… the Great Lakes Radio Consortium’s Lester Graham reports… conveying that warning to some cultures is especially difficult:
Transcript
Some people, because of culture or because of necessity, rely on fishing as a
way to supply an important part of their family’s diet. While fish is healthful food,
experts warn that fish from lakes and rivers can be contaminated by pollutants.
In the first of a two-part series on communicating the risks of eating
contaminated fish to ethnic groups… the Great Lakes Radio
Consortium’s Lester Graham reports… conveying that warning to some
cultures is especially difficult:
As the United States pulled out of Southeast Asia during the Viet Nam war, many people who
had been allies from Laos, Cambodia, and South Viet Nam found their way to the U.S. Some of
these people have always relied on fish for a large part of their diet.
After settling in the United States, they naturally turned to public lakes and rivers and began
fishing. They ran into a couple of problems. First, U.S. conservations laws put limits on the size
and how many fish they could catch, something they were not used to. Second, health officials
and conservation officials began to warn them about contamination. They told them chemical
pollutants could harm development in children and fetuses.
Josee Cung is with the Minnesota Department of Natural Resources. She says many of the
Southeast Asian immigrants were skeptical. They thought the government was conspiring to get
them to buy ocean fish from stores rather than take free fish from the lakes and rivers. Cung says
the immigrants had never heard of such a thing as contaminants you couldn’t see.
“PCB, mercury, they don’t understand that. So, that’s the big challenge. So, there are real
cultural, but there are also real educational barriers.”
As she distributed fish advisories suggesting that certain fish had higher levels of contamination,
Cung found the Southeast Asian immigrants were astonished. She says they are a practical
people. They feel if that can’t see something wrong with the fish, it must be okay to eat.
“‘But they’re fat! They’re shiny! They are big!’ You know, ‘But they are good to eat!’ So, that’s
the kind of thing. It’s more prevalent than relying on the advisory to change behavior.”
The State of Minnesota had pamphlets of the advisories printed up in the various languages of the
immigrants and handed them out at every opportunity.
Pat McCann is a research scientist with the Department of Health. She’s worked closely with
Josee Cung to try to explain the fish contaminants issue.
“But we found, with the Southeast Asian populations, the written translations aren’t that effective
because that group seems to communicate more verbally. So, in order to do outreach with those
groups, we try to do presentations and reach community groups in that way.”
And so Minnesota took a more hands-on approach. Josee Cung says instead of handing out
pamphlets alone, they started meeting with leaders in the various Southeast Asian communities in
Minnesota. For example, the Hmong, who helped retrieve downed U.S. pilots during the war are
a people of clans. Cung found if they could demonstrate to clan leaders ways to trim away the fat
of fish where contaminants such as PCBs concentrate and show which fish have lower levels of
contaminants, the word would spread throughout the community. Cung also found that it was
important not just to talk to the anglers who got the fishing license – usually men.
“And we go in homes doing cooking. And really check out their kitchen and say ‘Oh, this is how
you should do.’ And it’s most effective because it’s the women that prepare. He hasn’t got a
clue. He bring the fish home and leave it to the women. And the women decide how to cook it.”
Minnesota’s outreach program with Southeast Asian cultures is pretty advanced. Not every
government in the Great Lakes basin is as active. In recent years, the International Joint
Commission, the body that monitors the U.S. and Canadian boundary waters treaties and
agreements, has been admonishing the states and provinces to do more.
Alan Hayton is with the Ontario Ministry of Environment. He says the governments have taken
the message to heart, but finding the money to do the job is always a problem.
“We do have some communications with some groups such as in Ontario, such as the Chinese
community, which is well-organized and receptive to the information that’s in the guide. But, it’s
difficult. We don’t. We do the best job we can given the resources that we have.”
The International Joint Commission warns that it’s important that the states and provinces work
harder to reach cultures, such as those from Southeast Asia, that rely heavily on fish for protein.
For the Great Lakes Radio Consortium, this is Lester Graham.
There’s a trend among some Native Americans. They’re trying to return to more traditional diets. Many believe various health problems among Indian populations are due, in part, to adopting a diet much heavier in sugars, starches, and fats than their ancestors’ diet. But they’re concerned that pollution has tainted many of the traditional foods, such as fish. The Great Lakes Radio Consortium’s Lester Graham reports in the second of a two-part series on communicating the risks of eating contaminated fish to ethnic groups:
Transcript
There’s a trend among some Native Americans. They’re trying to return to more traditional diets.
Many believe various health problems among Indian populations are due, in part, to adopting a
diet much heavier in sugars, starches, and fats than their ancestors’ diets. But they’re concerned
that pollution has tainted many of the traditional foods, such as fish. The Great Lakes Radio
Consortium’s Lester Graham reports in the second of a two-part series on communicating the
risks of eating contaminated fish to ethnic groups:
A high rate of Native Americans suffer from diabetes and obesity. It’s commonly believed that
the European diet of processed grains, processed sugar, and fatty foods has contributed to the
health problems. So, some tribal members are looking at a traditional diet of fish and game and
the kinds of agriculture practiced by their forbearers. The idea is that traditional foods might be
more healthy for Native Americans.
But it’s become clear that some of those foods, particularly fish, are contaminated by pollutants.
PCBs and methyl mercury have been found in certain fish. Studies show those chemicals can
cause permanent health problems. Tribes have issued advisories, but some tribal leaders are
reluctant to discourage people from eating fish, even if it’s contaminated.
John Pursell works for the Minnesota Chippewa tribe. The tribe has issued advisories about
mercury in fish. But, Pursell says there’s a balance that has to be considered.
“We have to be careful that we aren’t advising people, tribal members, if we say ‘Don’t eat fish
of a certain size or from certain lakes,’ that we’re relatively certain that what they’re going to
replace that protein source with is not going to be more detrimental to their health. And that’s the
big concern.”
Pursell says, for example, his tribe is very concerned about dioxins. The tribe believes that
dioxins are responsible for a higher rate of cancer and other problems. And dioxins might be
present in the foods people in the tribe would eat instead of fish.
“But, we also know from the draft documents that the federal government has issued on dioxins,
that dioxins exist in fairly large quantities in such fatty foods as hamburger and cheeses. And of
course, these are foods that are found routinely in reservation commodity outlets.”
So, if it’s a matter of trading one kind of contamination for another, the logic goes, might as well
eat the healthier food, fish.
But the different tribes have different concerns and no one likes the idea of consuming
contaminated foods of any kind. So, there’s a lot of confusion about the best route to take to
dealing with the health problems among Native Americans.
Kory Groetchs is an environmental biologist with the Great Lakes Indian Fish and Wildlife
Commission. He says as interest in traditional foods builds, his agency is being asked for
answers.
“They have questions about industrial pollution and their impacts on traditional foods and, you
know, the balance between risks of consuming that food and the benefits of consuming it.”
Groetsch says the Commission is looking for funding to study ways to reduce the risk of
consuming contaminants. For example, one study tried to determine what size and where to catch
walleye with lower levels of mercury. He says more studies like that need to be conducted so
Native Americans can avoid the contaminants that might be present in traditional foods.
“And then definitely point out the situations where there is not concern so people can clear their
minds of these, if they have concerns, and they seem to, about industrial pollution such as methyl
mercury in fish, clear their mind of that and go back to a more traditional diet and eat in a more
natural, traditional way.”
Even those who are responsible for bringing the advisories on contaminants in fish to the
members of the tribe are hesitant. Maria Mabee is with the Seneca Nation in New York. She’s
an environmental activist and concerned about the effects of contaminants on health. At the same
time, she says there’s a limit to what she’ll recommend.
“You know, I can’t tell people to stop using fish for ceremonies. I just can’t do it. I won’t do it.
(laughs) I just, you know, I tell them about the risks, you know. I tell them what I know and I tell
them to make the best decisions for themselves.”
The tribes stress that the health benefits of fish should not be ignored. For many tribes, fish is a
staple. The question to answer they say is, if you don’t eat fish because of the risk of
contamination from pollution, will the food you eat instead be any more safe?
For the Great Lakes Radio Consortium, this is Lester Graham.
Fish is healthy food, but contamination from pollution means people should limit the amount of inland lake and river fish they
eat. Photo by Lester Graham.
States are struggling with ways to warn people, especially women of childbearing years and children, about the hazards of eating too much sport fish contaminated with toxic chemicals.
There are three major questions often asked when considering the environmental health of a body of water. Can you drink the water? Can you swim in it? And… can you eat the fish? Often the answer to the last question is very complicated. The Great Lakes Radio Consortium’s Lester Graham has the first report in a two-part series on the fish that ends up on your table:
Transcript
There are three major questions often asked when considering the
environmental health of a body of water. Can you drink the water? Can you
swim in it? And… can you eat the fish? Often the answer to the last
question is very complicated. The Great Lakes Radio Consortium’s Lester
Graham has the first report in a two-part series on the fish that ends up on
your table:
Mark Ford goes fishing almost every weekday. This day, he’s at a small
marina off of Lake Michigan. He’s carrying several rods and reels and a
couple of tackle boxes with him to an old dock…
Lester Graham: “Now, what do you fish for?”
Mark Ford: “Right now, whatever bites on the hook. Basically, I fish for bass,
catfish, walleye.”
This day, he’s just testing some new gear…
“Set my drag. Too loose.”
When Ford got his fishing license, he also got a guide telling him that the fish
he eats is contaminated. All inland lakes have some level of contamination
which could include pesticides, PCBs, and mercury.
Ford has a pretty good idea about what to do to reduce his exposure to the contaminants when he eats the fish..
“Yeah, first thing you want to do is cut off all excess fat to get away from a lot of the chemical
pollutants that’s not in the actual meat of the fish. That’s where most of the chemicals lie, in the fat. So, you cut that off and get to cookin’.”
Ford’s preparation is a good start. Trimming the fat will reduce exposure to PCBs and
similar compounds that are stored in fatty tissue. And just cooking the fish reduces some of the exposure to contaminants. But if a contaminant such as methyl mercury is present in the flesh of the fish, no amount of rinsing, boiling or frying will change that.
Unfortunately, many anglers are not as well informed as Mark Ford. A study in Canada
found a lot fishers don’t understand the contaminants or what to do about them. They judge
whether the fish is safe to eat by how well it fights on the line… by the color of the
flesh… or by the clearness of the eye. None of those things is an indicator of whether a fish is contaminated by toxic chemicals.
Alan Hayton is with the Ontario Ministry of the Environment. He says how much fish are
contaminated depends on the body of water. A ban on PCBs in manufacturing
has helped, although there are still decades worth of the pollutant in some lake
sediments. Agricultural pesticide restrictions and bans have helped reduce
contaminants in some other lakes.
“Well, if you want – are fish getting better or worse? Certainly over the years,
when you look at the Great Lakes, there’s been a considerable decline in the level of
contaminants in fish. Many of the inland lakes, both in Ontario and elsewhere – not
just around the Great Lakes, but elsewhere – there’s mercury in those fish. Mercury
concentrations don’t appear to be changing. They seem to be quite stable.
So, we find that in quite a high proportion of the inland lakes there are some consumption
restrictions.”
Mercury remains a problem because as coal-fired power plants release mercury
into the air… it’s brought down into watersheds by rain. There the problem is
complicated in some areas by any number of factors, including some bacteria that transform
simple mercury into the more toxic methyl mercury.
So, some bodies of water, such as the Great Lakes, have lower levels of some
pollutants, but some other contaminants are just as bad as ever. To complicate things
even more, some fish are more contaminated than others.
Faith Shottenfeld is with the New York State Department of Health.
“You know, it’s complicated because it’s going to vary from state to state, from body of
water to body of water and from fish species to fish species.”
Shottenfeld says that makes getting the message to anglers all the more difficult.
States are trying to figure out how to get the information to the people who eat
the fish, but there are very few general guidelines.
“So, I think that the best way to work your way through the complexities
is to really have a dialogue with somebody who understands the advisories and can
help you figure out what you need to do.”
But generally speaking, eating smaller fish, and limiting sport fish meals from local lakes to about once a week for men and once a month for women helps.
Angler Mark Ford says he’s not worried. He says to him, the health benefits of
fish offset the health risks of the contaminants.
“A month, I’d say I eat about twelve to 15 pounds of fish. I eat a lot of fish.
I like fish. Fish is healthy for you, too. It’s low in cholesterol if you cut the fat away from
it. It’s good brain food. That’s scientifically proven. And, if you prepare it
right, it tastes good!”
And Ford says he’s healthy. But experts indicate it’s hard to say what long-term
exposure to the contaminants in sport fish from area lakes will mean to human
health. They caution that children and women of child-bearing age should severely
restrict their intake of sport fish because the contaminants can damage the
development of fetuses and children.
For the Great Lakes Radio Consortium, this is Lester Graham.
