Big Ships Required to Flush

  • A ship discharging its ballast water (Photo courtesy of the US Geological Survey)

Ships should be bringing in fewer unwanted
pests into the Great Lakes. Both Canada and the
U-S are now requiring ships to flush out their
ballast water tanks before entering the lakes.
Tracy Samilton reports:

Transcript

Ships should be bringing in fewer unwanted pests into the Great
Lakes. Both Canada and the U.S. are now requiring ships to flush out their
ballast water tanks before entering the lakes. Tracy Samilton reports:

Ships need to take on ballast water to keep them stable. When they pump in
water from freshwater foreign ports, they also suck up pests.

Since 2006,
Canada has required ships to flush their tanks with salty ocean water
before entering the Great Lakes. The U.S. adopted the requirement at the
start of this year.

Collister Johnson is with the U.S. side of the St.
Lawrence Seaway, which connects the Atlantic Ocean to the Great
Lakes. He says the rule will eliminate almost 99% of freshwater
pests in ballast tanks.

“If they’re exposed to salt water, especially full strength sea water, they
are effectively killed.”

Samilton: “Why didn’t we do this before?”

Johnson: (laughs) “I don’t know.”

It won’t completely eliminate the problem because some aquatic pests can
still survive in the sediment in the bottom of ballast tanks.

For The Environment Report I’m Tracy Samilton.

Related Links

Stopping Ships’ Stowaways

  • A ship discharging its ballast water (Photo courtesy of the US Geological Survey)

Congress might take a final vote soon on a bill
that would make foreign ships treat ballast water to
kill unwanted species, before entering US waters.
Many environmental groups support the measure, but some
worry about the loss of state control. Chuck Quirmbach
reports:

Transcript

Congress might take a final vote soon on a bill
that would make foreign ships treat ballast water to
kill unwanted species, before entering US waters.
Many environmental groups support the measure, but some
worry about the loss of state control. Chuck Quirmbach
reports:

Backers of the ballast water requirement, recently passed by the House, hope to reduce the
number of invasive species brought in by foreign vessels.

Dozens of non-native species, like the zebra mussel, are causing major problems in the
Great Lakes. But the group ‘Midwest Environmental Advocates’ is raising concerns.

Executive Director Karen Schapiro says the House bill would prevent states from
developing ballast water treatment standards that are tougher than federal law, or that
take effect sooner.

“You know we would like to see the most feasibly stringent standards on the table, on the books,
even if that’s done on a state by state basis.”

But the shipping industry says it doesn’t want a patchwork of state regulations. The
national ballast water language is part of a Coast Guard bill that still has to be reconciled
with a Senate measure.

For The Environment Report, I’m Chuck Quirmbach.

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

Live Animal Import Laws

A recent report accuses the federal government of failing to take simple, inexpensive steps that could reduce the risk of live animal imports. Zebra mussels, Asian carp, and pets that get loose, such as Burmese pythons in Florida, hurt native wildlife and can damage the nation’s economy. Lester Graham talked with Peter Jenkins, one of the authors of the report issued by the Defenders of Wildlife. Jenkins says the U.S. Fish and Wildlife Service is one of the agencies that needs to do a better job screening for invasive species:

Transcript

A recent report accuses the federal government of failing to take simple, inexpensive steps that could reduce the risk of live animal imports. Zebra mussels, Asian carp, and pets that get loose, such as Burmese pythons in Florida, hurt native wildlife and can damage the nation’s economy. Lester Graham talked with Peter Jenkins, one of the authors of the report issued by the Defenders of Wildlife. Jenkins says the U.S. Fish and Wildlife Service is one of the agencies that needs to do a better job screening for invasive species:


Peter Jenkins: They’re charged with protecting native species. They’re charged with enforcing the
Endangered Species Act, which is an important part of this issue because these non-
native species threaten our native species, including threatening endangered species in
many cases.


Lester Graham: In the past, the US Fish & Wildlife Service has been accused of being too
slow to act, even when a problem is pointed out. Would the regulation changes you’re
talking about help speed that process?


PJ: Well, Congress would have to agree to commit more resources to the agency…I mean,
there is only one person, believe it or not, only one person whose job is to assess species
to be listed under that law to keep out of the country. Obviously, we need more than one,
we need some qualified professionals working this area. We don’t need millions and
millions of dollars, but we do need a significant increase, probably five or six or up to ten
professional staff looking closely at these imported animals to assess whether we’re
gonna have problems and which ones need to be restricted.


Now, how’s that gonna be paid for? Well, the industries that are bringing these species in
and that want to benefit from the import trade, whether it be pet or live animals or
biomedical testing or zoos or what have you…Those people bringing these species in
clearly should carry some of the cost of what they’re bringing in and in that way, the
taxpayers don’t get burdened too much.


LG: As you’ve mentioned, this is as much an economic problem as it is an environmental
problem. Why haven’t the dollars and sense of this issue really had an impact on the
politics behind making sure that we can restrict this kind of trade?


PJ: Well, that’s a great question and defenders of wildlife did do a white paper on the
economic impact of animal imports trade. The reason is very simple…the people who
benefit do not suffer the cost when these things go wrong. That is to say, the costs are
suffered by the public in terms of disease or invasive species concern or pests, so these
costs are externalized or passed on to the general public and it’s the taxpayers in the end
who wind up having to pay the costs. On the whole, these species that are brought in,
non-native species, are brought in for the pet trade…That’s by far the biggest reason that
species are brought in. That’s basically a luxury item, that’s not an essential item. Those
that benefit from luxury items should bare the cost.


LG: Now, nature seems to eventually cope with many of these exotic species, even the
invasive species to one degree or another and some people would say that this biological
pollution is nearly impossible to prevent so why fight the inevitable?


PJ: Uh, I don’t buy that argument at all. It’s like saying diseases are natural and people are
going to eventually cope with diseases, so why bother trying to prevent diseases? I mean,
we do it because we want to protect certain values. We want to protect our native species,
we want to protect human health, we want to protect the health of our livestock. Of
course we need to be protective and have adequate standards. I mean, we don’t need to be
operating under a law that was written in 1900 just because some people think it’s futile
to try to deal with this issue…We could cope with it.


HOST TAG: Peter Jenkins was one of the authors of a Defenders of Wildlife report calling on the government to do a better job of screening live animal imports. He spoke with The Environment Report’s Lester Graham. The report is available at www.defenders.org.

Related Links

Fish Stocking Taxing

  • As fewer Brown Trout from a state stocking program survive in the waters of Thunder Bay in Lake Huron, the fish takes on the allure of a trophy fish, especially since those that do survive can grow very large. Last year, a 28 pound Brown Trout won the tournament. It may be the biggest Brown ever to be caught in the state of Michigan. (Photo by Linda Stephan)

Most cities have their symbols. Imagine San Francisco without
the Golden Gate, New York without the Statue of Liberty, or
Miami without dolphins. Linda Stephan has the story of a
community that has linked itself with a fish that is not native to
its waters. And stocking that fish is costing taxpayers a lot:

Transcript

Most cities have their symbols. Imagine San Francisco without
the Golden Gate, New York without the Statue of Liberty, or
Miami without dolphins. Linda Stephan has the story of a
community that has linked itself with a fish that is not native to
its waters. And stocking that fish is costing taxpayers a lot:


The brown trout arrived in Lake Huron’s Thunder Bay by a
fluke. Back in the 1970s, about a thousand fish – surplus stocks
from inland waters – were simply tossed out into the bay by
biologists, as if the bay were a trash bin.


No one expected them to survive. They thought they’d just be
food for other fish. But the brown trout did survive. They
quickly grew large and feisty. The state started to stock these
waters with young brown trout every year because anglers
liked catching them.


In fact, it was so popular, they named a fishing tournament after
it: the brown trout Festival in Alpena, Michigan. This year, a
crowd of hundreds gathered, despite periodic rain showers, as
festival o-“FISH”-als weighed in a day’s catch… lake trout, walleye:


(Sound of announcer at tournament)


You don’t need a brown trout to win at the brown trout
Festival. And it’s a good thing because these days, most boats
don’t catch even one. That’s because things have changed.


The ecosystems of Lake Huron and the other Great Lakes are
changing rapidly, as foreign invasive species, such as the zebra and
quagga mussels, steal away food at the bottom of the lake’s
food web.


Plus, a migratory bird that’s been showing up in this bay in huge
numbers, cormorants, have been eating the small browns
stocked by state fish nurseries before the fish ever make it into
open waters.


For the past decade, the Brown hasn’t survived all that well in
Lake Huron. So today biologists estimate that, taking into
account all those fish that don’t survive, every time an angler
catches a big Brownie, it now costs taxpayers close to
three hundred dollars.


In other words, each brown trout caught represents about
three hundred dollars spent by the state stocking program.
Even though the brown trout is not native, people here say the
fish belongs in these waters.


Hobbyist Dick Cadarette at the brown trout Festival says the Brown has a special allure for
the angler:


“Well, because they’re the best eating and they’re the hardest to
catch. That’s why we call it the brown trout because anybody
can catch a steelhead – I mean a lake trout – but they can’t
everybody catch a Brown.”


As the large fish becomes more and more elusive, it takes on
the allure of a trophy fish.


Fisheries Biologist Dave Fielder says because of the cost – for
years now – the state has had good reason to quit stocking these
waters with brown trout, but they still haven’t. No one’s
willing to see the namesake of the brown trout Festival
disappear:


“What’s always amazed me is how the natural resources in
Michigan, including the fisheries that we enjoy in the Great
Lakes, is really a part of that local heritage and quality of
life for these local communities and becomes an important part of the local existance and indentity it’s important that we
as scientists don’t lose sight of that.”


But some say the fact that the local community has gotten used
to seeing the brown trout does not mean it belongs in the lake.
Mark Ebener is a Fisheries Biologist for the Chippewa-Ottawa
Resource Authority. It regulates fishing for five Native
American tribes:


“You tell a lie long enough and sooner or later people
believe it and accept it as the truth. You know it’s not that
brown trout belong here. brown trout were introduced
and they continue to be defined as an introduced species
into North America.”


Ebener says since the brown trout does no harm to native fish,
such as the lake trout, his organization doesn’t oppose the
stocking program. But he also says at the current cost, the
brown trout is a clear waste of taxpayer money.


Back in Alpena, Biologist Dave Fielder agrees the state can’t
keep stocking the lake with browns if so few continue to
survive. But, an angler himself, he looks with envy on a
mounted brown that took last year’s top prize in the tournament,
an unbelievable 28.2 pounds:


“Can you imagine landin’ that fish? That must have been
somethin’. Anybody’s who’s caught fish can look at that and imagine the battle they must’ve went through and the excitement they must’ve felt. And those are real feelings and that’s not to be
trivialized.”


That’s evidence to Fielder, and others who fish these waters,
that at least some brown trout have what it takes to complete
for food in the changing ecosystems of Lake Huron.


For the Environment Report, I’m Linda Stephan.

Related Links

Making Boat Washing Mandatory

  • Sarah and Mike Litch rake the bottom of Little Glen Lake, identifying plants to make sure there are no new foreign invaders. They want to catch problems early before they spread and completely take over this lake. (Photo by Linda Stephan)

Aquatic plants and animals can cling to the bottom of
recreational boats. That’s one way invasive species are spread. A couple of hitchhiking zebra mussels, or a plant
caught in the propeller are enough to alter the ecosystem of an
entire lake. One resort region has passed laws requiring boaters
to wash their boats before putting them into their local lakes.
But some state officials don’t like the new laws, and that
might make it impossible to enforce them. Linda Stephan
reports:

Transcript

Aquatic plants and animals can cling to the bottom of
recreational boats. That’s one way invasive species are spread. A couple of hitchhiking zebra mussels, or a plant
caught in the propeller are enough to alter the ecosystem of an
entire lake. One resort region has passed laws requiring boaters
to wash their boats before putting them into their local lakes.
But some state officials don’t like the new laws, and that
might make it impossible to enforce them. Linda Stephan
reports:


Little Glen Lake is known for unpredictable winds, and clear
blue waters… at times the lake is turquoise. It sits against
glacial dunes that lead to the eastern coast of Lake Michigan.
Sarah Litch retired here with her husband Mike:


“It was kind of a toss-up between New England and here. Miss
the mountains, but we love the water here. Although there are
so many water issues now. I don’t know.”


Those water issues include foreign invasive plants that could
take over Little Glen Lake:


On a pontoon boat, the Litch’s zig zag across the lake, raking up
aquatic plants at the bottom. If there are any invaders, they
want to find them early.


One of the bad guys they’re looking for is Eurasian water
milfoil. That’s a long, thin plant with feather-like green leaves.
Another invader is Hydrilla. You’ve probably seen it in
aquariums. It’s taken over lakes from California to Indiana, and
on to Maine. Both plants grow very quickly, they choke out native
fish habitat, and form a green carpet on the lake surface:


“And then it can be all – you’re trying to boat in all this tangle
of aquatic plants, or swim. So it just ruins a lake.”


These invaders have likely spread from lake to lake across the
US hitchhiking on boats pulled out of one lake, and headed for
another.


Some states such as Maine and Minnesota now require boaters
to make sure crafts and trailers are free of aquatic nuisances
before they drive down the road with them, possibly
endangering other lakes. And in those states, officials inspect
boats, too.


But other states, such as Pennsylvania and Michigan, have NOT
taken those steps, and Michigan borders four of the five Great
Lakes.


Since the state hasn’t passed laws to prevent boats from moving
invasive species from one lake to another, some local officials
have.


Sarah Litch designed a local law that requires boats to be washed
before going into local inland lakes, and it easily passed in two
adjoining communities. So around here, it’s a 500 dollar fine if
you don’t wash your boat.


Homeowners provide a free wash station at the main point of
entry to Little Glen Lake, a state-owned boat launch, but a few
boaters had refused the voluntary local inspections. That
frustrated Sarah Litch enough to fight for new local laws:


“Just to give people that are working at the boat wash a little more
backup when they have a refusal. So that they can inform the
individual and take their license if they refuse.”


But the local governments might end up in a power struggle
with the state agency that controls the boat launch, the
Michigan Department of Natural Resources. The state
agency doesn’t like this new local law.


Jason Fleming – who’s with the agency – says the homeowners’
boat wash has been successfully running on state property for a
decade, but only because the state allows it with special
permission:


“When we established that with the association, it was based on
a voluntary basis. So we’d have to review the terms and the
language of that agreement.”


In other words, if workers at the wash station start reporting
boaters to the local sheriff for refusing their services. Fleming
says the state might kick them off the state-owned boat launch
property. He says a voluntary approach is enough.


State officials don’t believe the local law applies to the state-
owned boat launch.


Chris Bzdok is an environmental lawyer. He says state courts have repeatedly ruled that local
governments can make laws like this one… and they can enforce them:


“The localities have a right to protect these resources – whether
they’re being accessed through a road end, through a private
marina, or through a state facility. The larger question is why
the DNR has a problem with it. What would be any good-faith,
genuine, substantive reason for opposing that?”


Scanning the lake from the boat launch, Sarah Litch talks of
what to do when – not if – the next invading plant or aquatic
animal arrives.


She says the best way to protect the lakes is to enforce the local
law, to make sure boats don’t bring in new invaders.


For the Environment Report, I’m Linda Stephan.

Related Links

The Invasion of the Quaggas

  • A close-up of the quagga mussel. Quaggas have spread in all of the Great Lakes except Lake Superior. (Photo courtesy of the Michigan Sea Grant Archives)

Whitefish is a main dish for everything from fish boils to fancy dinners all around the Great Lakes region. But in some areas of the Great Lakes, whitefish aren’t doing so well. Rebecca Williams reports on what’s happening to the fish many people love to eat:

Transcript

Whitefish is a main dish for everything from fish boils to fancy dinners all around the Great Lakes region. But in some areas of the Great Lakes, whitefish aren’t doing so well. Rebecca Williams reports on what’s happening to the fish many people love to eat:

(sound of knives getting sharpened and fish being filleted)

Mike Monahan sells fish from all over the world at his seafood market. But he says whitefish is a very popular seller.


“It’s been there forever, and everybody just expects it to be there, and it’s inexpensive. But really it’s a great fish, as far as a nice light delicate fish, I’d put it up against the soles and flounders.”


Monahan says he’s still getting good supplies of whitefish. So, for now, he’s happy.


But some of the people who catch whitefish are worried. Commercial fishers have been hauling in skinnier whitefish in some parts of the lakes. It’s taking whitefish longer to grow to a size worth selling. And in some cases, the fish aren’t fat enough to make a good fillet.


(sound of shorebirds)


Paul Jensen fishes for whitefish in Lake Michigan. He says lately, he’s had to move his boat to deeper waters. That’s because whitefish are hungry and they’re swimming out deeper. They aren’t finding their favorite food. It’s a little shrimp-like creature called Diporeia.


“Diporeia are probably like a Snickers bar to whitefish; they were high in fats, high in lipids and it was their main food – it was very nutritious for them and it affected their growth rate. Eating Diporeia a fish could reach maturity maybe in 18 months or 2 years. Now we’re looking at fish that may take 5 years to get there.”


Whitefish are not eating Diporeia because it’s vanishing. In some places, researchers used to find 10-thousand of the little critters in a square meter of sediment. Now there are very few, or none at all.


Tom Nalepa has been trying to figure out why. Nalepa is a biologist with the National Oceanic and Atmospheric Administration’s Great Lakes Environmental Research Lab.


“It’s a real scientific puzzle as to why Diporeia is declining. It’s definitely related to the spread of quagga mussels and zebra mussels but that exact negative relationship is kind of elusive at this point in time.”


But Nalepa says he’s sure the invasive mussels are to blame. The mussels got into the Lakes in the ballast tanks of foreign ships. And they’ve spread in all the lakes except Superior.


Tom Nalepa says he’s seen populations of Diporeia crash right around the time the mussels were booming. Nalepa says now, Diporeia’s gone from large areas in most of the Lakes.


That’s bad because Diporeia is an important food source for most of the fish in the Great Lakes.


But for whitefish it’s really crucial. Back in the good old days, Diporeia made up about 80% of their diet.


Tom Nalepa says whitefish are trying to find something else to eat. He’s seeing them switch to a snack food that could make them even skinnier.


They’re starting to eat quagga mussels.


“When whitefish feed on quagga mussels they have to deal with the shell which has no energy content at all and it has to pass the shells through its digestive system so basically the fish feels full when it’s not getting any energy source.”


Nalepa says to the fish, quagga mussels must seem like good food, because there are lots of them.


He says quagga mussels are booming, because they can live in harsher conditions than zebra mussels can. So biologists are predicting quaggas will be even worse for the lakes than zebra mussels.


“Where are things ultimately going to end up? People may just have to get used to fewer fish. Because basically now we’re trading the fish community for the mussel community. The lakes are loaded with mussels instead of fish now. It may be just the way it’s gonna be.”


Some fishermen are already seeing things change. One day last season, Paul Jensen pulled in some of his nets. He was expecting fish.


“It was kind of startling because the amount of quagga mussels that came up with those nets far exceeded the catch of fish. And we hadn’t really equipped the boat with a snow shovel to shovel quagga mussels out of the boat. The impacts are startling because you begin to wonder, if our little net caught these, how many are there and what are the impacts going to be down the road?”


Jensen says he wishes the invaders had never gotten into the lakes in the first place, because there’s no way to predict what effect they’ll have next.


But some scientists worry these changes at the bottom of the food chain will lead to a major collapse of the fish stocks that many people depend on.


For the Environment Report, I’m Rebecca Williams.

Related Links

Invasives Destroying Great Lakes Food Chain

  • Biologists sorting fish. The populations of smaller fish that game fish eat have collapsed in Lake Huron. (Photo courtesy of MI DNR)

Although zebra mussels have been affecting the ecology of the Great Lakes since they were first found in 1988, researchers are continuously surprised at how much damage they’ve caused. Now, biologists are wondering if zebra mussels and the more recently arrived quagga mussels are to blame for a collapse of the fishery in one of North America’s largest lakes. Lester Graham reports the researchers are also wondering if this collapse is a preview of what will happen to all of the Great Lakes:

Transcript

Although zebra mussels have been affecting the ecology of the Great Lakes since they were first found in 1988, researchers are continuously surprised at how much damage they’ve caused. Now, biologists are wondering if zebra mussels and the more recently arrived quagga mussels are to blame for a collapse of the fishery in one of North America’s largest lakes. Lester Graham reports the researchers are also wondering if this collapse is a preview of what will happen to all of the Great Lakes:


It’s off-season for charter boat fishing and Captain Wayne Banicky asked if we could meet at a local watering hole called the Boat Bar. Captain Banicky takes people out fishing on Lake Huron. Well, he used to. The past few years he’s been charter boat fishing in Lake Michigan. He says fish started to become more scarce on Lake Huron, and he was forced to make the move.


“Economics, pure and simple. Dollars and cents. Once you start seeing a decline and being on the water every day and you see those declines in your numbers, it’s just a matter of time before financially you can’t afford to stay there. Those dock fees aren’t given up free. That’s an expensive tab to pay every year.”


Fishing for most species in Lake Huron is not good. But the story is not just a matter of not stocking enough fish or just a bad year, it’s a matter of a collapse of the bottom of the food chain. It’s not just the fish sport fishers like to catch that are down, it’s their prey: the smaller fish those big game fish eat. Prey fish stocks have collapsed, and supplies of the food those small prey fish eat, the plankton, have also collapsed.


Jim Johnson is with the Michigan Department of Natural Resources Alpena Fisheries Research Station.


“There was a huge decline in the amount of nutrients available to zooplankton and phytoplankton in the middle of Lake Huron. These are the basic nutrient bits that fish eat. And it appears now to most of us in the scientific community that a large portion of the nutrients that used enter Lake Huron are now being trapped by zebra and quagga mussels and not finding their way to alewives and other prey fish.”


Scientists from different government agencies and universities in the U.S. and Canada had been noticing changes, but things have gone seriously wrong very quickly in Lake Huron, and it might go wrong other places.


Tom Nalepa is with the National Oceanic and Atmospheric Administration’s Great Lakes Environmental Research Lab. He says tiny aquatic food sources for fish, such as a shrimp-like organism called diporeia, are declining dramatically in other Great Lakes.


“All the players are in place for it to happen in these other lakes too, you know, the loss of diporeia, the expansion of quagga mussels. And maybe Lake Huron is the first to show a collapse in the prey fish. What does it mean? Well basically, you know, there’s not going to be many fish out there for the sport fisherman to catch anymore.”


And sport fishing is multi-billion dollar industry in the Great Lakes. Back at the Boat Bar, charter fishing boat captain Wayne Banicky says fishing is still good in Lake Michigan, but he worries when he thinks about what happened in Lake Huron.


“I think that the fishery as a whole in the Great Lakes is in serious jeopardy right now. Something’s got to be done.”


But the question is what? What can be done when invasive species are changing an entire ecosystem to the point the fishery collapses?


“I don’t know to be honest with you. I don’t think any one of us knows. It’s scary, that much I will admit to you. It is scary right now.”


And guys like Captain Banicky aren’t the only ones worried.


Jim Johnson at Alpena Fisheries Research Station says you can’t undo the damage that’s already done. It’s just a matter of waiting to see how nature responds to the invasive zebra and quagga mussels and other invaders. Johnson says the key is to prevent more invasive species from being introduced to the lakes.


“The best we can do right now, I think the single most effective thing we as managers can do, is to make it understood by the decision makers just how disruptive the invasive species are and try to put a stop to those.”


The source of many of these invasive species is the ballast tanks of foreign ships entering the Great Lakes. Some regulations have reduced the chance that more invasive species will hitchhike to the Great Lakes, but more are still getting in. In the meantime, agencies such as the US Environmental Protection Agency and the US Coast Guard say Congress hasn’t given them the authority to regulate foreign ships strictly enough to stop new invasive species from entering.


So, fishery managers can only watch the other Great Lakes for more signs of a collapse of the fisheries as they’ve only been able to stand by and watch happen in Lake Huron.


For the Environment Report, this is Lester Graham.

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Disappearing Act at Bottom of Food Chain

A researcher says the decline of some tiny aquatic animals at the bottom of the food chain continues in the Great Lakes. The GLRC’s Chuck Quirmbach reports:

Transcript

A researcher says the decline of some tiny aquatic animals at
the bottom of the food chain continues in the Great Lakes. The
GLRC’s Chuck Quirmbach reports:


There’ve already been some signs that organisms vital as food for
Great Lakes fish are dropping in numbers. Now comes the first batch of data collected
for the EPA in all five lakes from 2001 to 2005.


Project Director Mary Balcer of the University of Wisconsin-Superior
highlights one species that seems to be in more trouble:


“One of the more important things is that the diaporeia are disappearing. These are small
shrimp-like animals that live down in the bottom sediment. And scientists had been noting
decline in Lake Michigan and Lake Huron for several years and our data confirms that
the organism are continuing to go down in numbers.”


Balcer says scientists believe zebra mussels might stealing the food
the tiny organisms used to eat.


For the GLRC, I’m Chuck Quirmbach

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Return of the Toxic Algae

A new report says the Great Lakes are being threatened by toxic algae growth. The blue-green algae is reappearing despite efforts in the 1970’s to combat the problem. The GLRC’s Laleah Fernandez reports:

Transcript

A new report says the Great Lakes are being threatened by toxic algae
growth. The blue-green algae is reappearing despite efforts in the
1970’s to combat the problem. The GLRC’s Laleah Fernandez reports:


Environmental groups say phosphorus pollution is causing the growth of
blue-green algae, which can kill fish and plants in the lakes. Phosphorus gets in the lakes
when lawn or farm fertilizers run off into waterways and because dishwashing detergent
still contains phosphates.


Hugh McDiarmid is with the Michigan Environmental Council, which released
the report. He says invasive species, such as zebra mussels, also promote
the growth of the toxic algae:


“They filter the water and make it clearer, which would seem on the surface
to be a good thing, but allows sunlight to reach deeper into the water
column and allows algae, therefore, to grow much deeper in the water than it
had before the mussels arrived.”


McDiarmid says shallow lakes such as Lakes Erie and St. Clair are especially
vulnerable because the algae on the bottom of the lakes is closer to sunlight.


For the GLRC, I’m Laleah Fernandez.

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