Salmon Fishery on the Rocks

  • The Chinook salmon was initially introduced to the Great Lakes in the 1870s. Michigan, New York and Wisconsin reintroduced the Chinook salmon to the Great Lakes in 1966. (Photo courtesy of USFWS)

There’s a decision looming for Lake Huron that would have been unthinkable 10 years ago. The state must decide whether it should keep putting chinook salmon in the lake. The fish has been the driving force behind sport fishing in the Great Lakes. But the salmon’s future in the Upper Lakes is now questionable. Peter Payette reports:


It’s hard to overstate how drastically salmon transformed the Great Lakes after they were introduced more than 40 years ago.


Ed Retherford is a charter boat captain on Lake Huron.
He says in the old days on a weekend in Rockport he’d see cars with boat trailers backed up for a mile or two waiting to launch.
But that’s all gone now.


“You’d be lucky, except maybe for the brown trout festival, you’d be lucky to see twenty boats there on a weekend. It just decimated that area. You can imagine the economics involved.”


Chinook or king salmon practically disappeared from Lake Huron about seven years ago. Most of the charter boats are gone now because the kinds of fish that remain are just not as exciting to catch as salmon.


State officials figure little towns like Rockport lose upwards of a million dollars in tourism business every year without the fishery.

More about Chinook salmon from the DNR

A related Environment Report story

Ten Threats to the Great Lakes

Transcript

The salmon’s demise followed the disappearance of its favorite food, little fish called alewives. Scientists say there were too many salmon eating the alewives and problems lower down on the food chain caused by invasive mussels.


State fisheries biologist Jim Johnson says salmon would rather starve than eat something besides an alewife.


“So at first, the salmon went through a period of just being starved out. They didn’t have enough to eat. They wouldn’t switch to eating round gobies and they died of malnutrition.”


The changes in Lake Huron since have been significant.


Neither salmon nor alewives are native to the lake. And with them out of the way, native fish like walleye have come back.


The state continues to stock one and a half million Chinook salmon in Lake Huron every year.


But Jim Johnson says the walleye eat most of them. He says Lake Huron can’t support a big salmon fishery any more.


“It’s just not realistic. The lake doesn’t offer that and there’s nothing the DNR can do to change that.”


The question now is whether to stock any chinook salmon in Huron at all. Giving up on the most popular sport fish in the Great Lakes is hard to swallow but most people see the writing on the wall. So even if stocking continues, it will likely be a fraction of what it once was.


On the other side of the state, there are now worrying signs that the same fate might be in store for Lake Michigan.


There are lots of salmon in Lake Michigan today.


But charter boat captain Denny Grinold says something went wrong last fall. He says the big salmon, the four-year old fish that come up into the rivers to spawn in August, never showed up.


“You keep looking for ‘em. You keep looking for ‘em. You go out and you fish the patterns that you’ve fished in the past. Those large Chinook should be there and they just weren’t there.”


The warm water and lots of windy days last year might account for the missing fish. But research provides no comfort for the future.


The DNR has created a system of red flags to evaluate the conditions for salmon in Lake Michigan. These are based on things like how much food is available, the weight of the fish and how many are being caught.


Twenty of the 30 flags have been triggered.


The manager of Lake Michigan for the Department of Natural Resources, Jim Dexter, says the lake is not a happy place.


“The lake is very perturbed. It’s certainly not a stable, quality ecosystem. I mean it’s working right now. It’s producing a fishery. People are happy but it’s tenuous.”


There’s not much the state can do to change anything.


If the experience of Lake Huron is any guide, it’s the presence of those little feeder fish, alewives, that is critical.


At the moment, there are believed to be fewer alewives in Lake Michigan than at any time on record.


For the Environment Report, I’m Peter Payette.

Great Lakes Record Lows

  • Lower water levels on the Great Lakes make some channels such as the Muskegon River too shallow for big freighters to enter fully loaded. (Photo by Lester Graham)

The Great Lakes are hitting new record low water levels. The water is so low that
big 1000-foot cargo ships are running aground. There’s debate about
whether this is just part of the historic ups and downs of the Great Lakes, or if it’s the
effects of global warming. Lester Graham reports from Lake Michigan’s Muskegon
River, a trouble spot for some of the big ships:

Transcript

The Great Lakes are hitting new record low water levels. The water is so low that
big 1000-foot cargo ships are running aground. There’s debate about
whether this is just part of the historic ups and downs of the Great Lakes, or if it’s the
effects of global warming. Lester Graham reports from Lake Michigan’s Muskegon
River, a trouble spot for some of the big ships:


Here at the end of the pier next to the lighthouse, it’s cold, it’s icy and it’s windy. And
it’s hard to imagine a ship navigating its way into this channel, but ships do on a
regular basis to bring coal to a power plant. This year, however, some of the ships
have ended up aground here simply because of lower lake levels and more sediment
in the channel:


“There’s been three this summer here in Muskegon. They go hard up on the sand.”


Dennis Donahue is the marine superintendent for the National Oceanic and
Atmospheric Administration’s Lake Michigan field station at Muskegon, Michigan. He
says this year’s groundings of cargo ships just hasn’t happened that often in the
past:


“Well, we haven’t had a grounding here, certainly in the last 15 years due to water
levels.”


Lester Graham: “So what’s happening here? What’s going on?”


Donahue: “Well, there’s a couple of things, we’ve got the water levels dropping and
then we’ve got some weather patterns that are carrying sediment to the mouth of the
Muskegon River. So, those two compound and create shoal areas.”


So lower water and a rising bottom mean channels are more shallow. That means
ships have to carry less cargo, and that costs the shippers reportedly a million
dollars per ship per year.


Scientists have been monitoring the dropping lake levels for close to a decade now.
At NOAA’s Great Lakes Environmental Research Lab, Deputy Director Cynthia
Sellinger says she’s been seeing a trend in the weather that’s causing the problem:


“We’re having a lot less precipitation and a lot more evaporation. And that’s
impacting the water levels on the lake.”


Less snow pack and rain mean less water filling the lakes, and with warmer winters
Sellinger says there’s less ice cover to protect the lakes from massive evaporation.
Historically, about 50% of the lakes’ surfaces have been covered by ice. These
days, it’s more like ten to 20%. Cold air hits the warmer water and
carries it away. For Lake Superior alone, a one-inch drop is more than 500 billion
gallons. During the past decade, Superior has lost nearly 13 trillion gallons.


“The upper lakes, Superior, Michigan and Huron, are very close to their record low.
So, it’s approaching an extreme. Superior reached its record low in 1926 and just
this year it broke the record low for September. So, 2007 now is a new record low
for Lake Superior. Lakes Michigan and Huron are approaching their record low.”


Sellinger and her colleagues are not ready to say global warming is causing the
lower lake levels. It might just be a part of a long cycle of ups and downs of the lakes.
But the lower water levels do fit some of the computer model predictions about
global warming.


Lower lake levels causing problems for big cargo ships and marinas catering to
recreational boaters are problems enough. But, some environmentalists say if lower
water levels are caused by global warming, the pressures on the water in the Great
Lakes likely are going to get a lot worse. Andy Buchsbaum heads up the National
Wildlife Federation’s Great Lakes office:


“The hidden threat of global warming is that not only does it affect Great Lakes water
levels simply because of increased evaporation or increased temperatures changes
precipitation, but the threat it makes to Great Lakes water levels is even greater.
Because global warming, global climate change, is having massive effects already
and is likely to have even greater effects on water supplies in the Southwest, the
Southeast and all over the country. And as those pressures increase, the pressure
to divert Great Lakes water will increase exponentially.”


We don’t know whether new diversions to dry areas of the country could cause as
much of a problem as less precipitation and more evaporation of the Great Lakes
already do. But, it would certainly aggravate the problem. The effects of water
levels dropping further mean more economic hardship for shipping and tourism. And
environmentalists say ecological damage to coastal habitat that fish and other
wildlife need to survive could be on a scale that’s not been seen on the Great Lakes
in recorded history.


For The Environment Report, I’m Lester Graham.

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

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

Great Lakes Water Levels Drop

  • The International Joint Commission will be studying water levels to find out why Lake Michigan (pictured) and the other upper Great Lakes have been lower. (Photo by Lester Graham)

A five year, 15 million dollar study will look at water levels of the Great Lakes.
Chuck Quirmbach reports on some of the concerns:

Transcript

A five year, 15 million dollar study will look at water levels of the
Great Lakes. Chuck Quirmbach reports:


Since 1911, the U.S.-Canadian International Joint Commission, or IJC, has
regulated how much water flows out of Lake Superior and eventually into
the rest of the Great Lakes.


Currently, Lake Superior is near its record low level, and Lakes
Michigan and Huron are relatively low. That’s triggering several
problems, including forcing many ships to carry less cargo.


The IJC study will look into the potential reasons for the water level
changes. Study co-chair Eugene Stakhiv says it might not be a simple
matter:


“It’s a whole series of issues that we’re going to have to untangle and
then sort of resolve almost independently and then put the puzzle back
together again.”


Stakhiv says the study will look at big-picture topics, like the role
of climate change and how the channels between the lakes are
engineered.


For the Environment Report, I’m Chuck Quirmbach.

Related Links

Invasive Die-Off Stirs Fishery Debate

  • A naturally reproduced wild lake trout fingerling. (Photo courtesy of MI DNR.)

The fisheries in the Great Lakes are seeing dramatic changes. In one lake, an invasive species that has become part of the food chain has collapsed. But some native fish are doing better because of that collapse. Lester Graham reports some fishery managers are debating what to do next:

Transcript

The fisheries in the Great Lakes are seeing dramatic changes. In one lake, an invasive species that has become part of the food chain has collapsed. But, some native fish are doing better because of that collapse. Lester Graham reports some fishery managers are debating what to do next:


When we started digging canals, connecting the lakes to the Atlantic Ocean, things changed a lot for the fish in the Great Lakes.


First, the sea lamprey got into the lakes through the Welland canal that bypasses Niagara Falls.


The lamprey is an eel-like parasite that nearly wiped out the big fish in the Great Lakes by attaching to them and sucking the life out of them.

Also slipping through the canals was a smaller fish, the alewife. Since the lamprey wiped out most of the predator fish in the lakes, the alewife population exploded. They out-competed native fish for food. It got so bad, that by the mid 1960s, if you weighed all the fish in Lake Michigan, more than 80% of the weight would have been alewives.


So, once wildlife managers got the sea lamprey under control, they had to figure out what they could do to get alewives under control. The fish biologists decided to introduce new predators, trout and salmon, to prey on the alewives. These fish were not native to the Great Lakes. Expensive nurseries were built by federal and state game agencies to keep supplying new trout and salmon every year to prey on alewives.


Forty years later, in Lake Huron, the alewife population collapsed, and in Lake Michigan alewives are declining rapidly. Mission accomplished, right?


Well, in that 40 years, a whole recreational fishing industry has grown up around fishing for those introduced trout and salmon. Some fishery managers now say we have to find a balance of the right amount of alewives to sustain the introduced trout and salmon fishery. So, recently states have cut their trout and salmon stocking programs to give alewives a chance to recover.


Tom Trudeau [who] operates a fish nursery for the state of Illinois says it would cause trouble to try to take the Great Lakes back to native fish only.


“We do have this industry that we have pressure to keep. You know, you’re putting a lot of people out of business if you get rid of it.”


And Trudeau says because of ecological damage, many of the smaller native fish on which big predators used to feed have been wiped out.


“So, I mean, of the six or seven species in that category, we only have one. And a couple of them are extinct. So, I mean, we could talk about going back to the ideal situation of pure native species, but we’ve disrupted the habitat so much.”


So, the argument goes, the invasive alewives are now needed. But something unexpected happened when the alewives disappeared from Lake Huron. The native fish, walleye, yellow perch, and lake trout started doing better.


Dave Fielder is a fisheries research biologist with the Michigan Department of Natural Resources.


“We’ve long known that adult alewives were a predator and a competitor on newly hatched perch and walleye fry. We just didn’t realize how substantial that effect was until finally the adult alewives were removed from the system and now we’re enjoying some greatly increased reproductive success. Walleye, particularly in Saginaw bay, are at some of the highest levels that we’ve seen in a long time.”


But, after 40 years, people are used to fishing for those introduced trout and salmon. And some fisheries managers are wondering what will happen to all those expensive nurseries that provide their jobs.


What happens to all of those charter boat fishing operations, fishing tourism, if the government were to stop stocking those trout and salmon? Would they switch to fishing for native fish? And, can the native fish even survive in the long-run since so many of the smaller native prey-fish are no longer around?


Dave Fielder says it’s hard to say.


“So, we’re kind of in the middle of a change – it’s really a paradigm shift in many ways – and that’s always scary because nobody really knows how we’re going to end up, but I prefer to be optimistic. I think there are a lot of reasons to be hopeful in regards to the benefits that we’re seeing for our native species.”


But some fisheries managers say the debate of whether to go all native or to try to find the right mix of native and non-native fish is not over. Since invasive species, pollution, and habitat destruction have changed the Great Lakes so much, wildlife managers think they’ll still have to keep stocking one kind of fish or another to keep the recreational fishing industry going. If that’s the case, does it matter whether it’s native fish, or the introduced fish that anglers have grown to like so much?


For the Environment Report, this is Lester Graham.

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.

Related Links

Radioactive Waste Dump Near Great Lakes?

A member of Congress is trying to get the US to investigate a Canadian plan to build a radioactive waste dump. Lester Graham reports the radioactive materials would be put in an underground site less than a mile from one of the Great Lakes:

Transcript

A member of Congress is trying to get the U.S. to investigate a Canadian plan to build a radioactive waste dump. Lester Graham reports the radioactive materials would be put in an underground site less than a mile from one of the Great Lakes:


Ontario Power Generation wants to construct a Deep Geologic Repository, basically an underground dump, for low-level and intermediate-level radioactive waste from Ontario’s nuclear power plants. Bart Stupak is a member of Congress from Michigan. He says the proposed site would be built near Lake Huron at the Bruce Nuclear Site, where there have been reports of problems with radioactive contamination of water in the past.


“It’s gonna be within a mile of the Great Lakes. I think that’s not appropriate. You know, you’re lying within the watershed and we know no matter what great efforts we may make to keep pollution at a minimum, it does occur. And, unfortunately in this case we’ve seen at that site some radioactive contamination already.”


Stupak has called on the U.S. EPA and other agencies to look into what risks the Canadian radioactive waste dump might pose to the U.S. cities and the ecology of the Great Lakes.


For the Environment Report, this is Lester Graham.

Related Links

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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Yellow Perch Making Resurgence?

A popular fish might be making a comeback in the upper Great Lakes. Yellow perch were once a favorite catch for sport and commercial fishermen, but their populations crashed in the 1990’s. Biologists say new surveys in Lakes Huron and Michigan have found huge numbers of young perch. The GLRC’s Peter Payette reports:

Transcript

A popular fish might be making a comeback in the upper Great Lakes.
Yellow Perch were once a favorite catch for sport and commercial
fishermen, but their populations crashed in the 1990’s. Biologists say
new surveys in Lakes Huron and Michigan have found huge numbers of
young perch. The GLRC’s Peter Payette reports:


A survey of Lake Michigan found more perch were born last year than in
the best years on record. Two or three times as many.


Recent studies of perch in Lake Huron’s Saginaw Bay have shown
similar results. It’s not clear why fish numbers would suddenly
skyrocket. Weather is believed to be one factor.


Dave Fielder is a biologist with the Michigan DNR. He says perch in
Lake Huron have also benefited from the decline of alewives, which are
an invasive species.


“We’ve known for a long time that alewives are formidable predators and
competitors on newly hatched yellow perch fry.”


Fielder says most of the newborn perch are not surviving so the adult
population in Saginaw Bay has not grown. He says it may be too many
perch have been born and there’s not enough food for them all.


For the GLRC, I’m Peter Payette.

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