Fish Detectives

  • The fish detectives (a.k.a. scientists who specialize in fishery genetics) survey the scene. (Photo courtesy of the Lake Erie Center)

On television, the CSI detectives make forensic lab work look glamorous. It’s a cinch for them to track a criminal by the DNA left behind at the scene. In real life, DNA is also a powerful tool for solving environmental crimes and mysteries. Rebecca Williams visits the Fish Detectives:

Transcript

On television, the CSI detectives make forensic lab work look glamorous. It’s a cinch for them to track a criminal by the DNA left behind at the scene. In real life, DNA is also a powerful tool for solving environmental crimes and mysteries. Rebecca Williams visits the Fish Detectives:


(Sound of gulls and reel being cast)


It’s midday, and it’s so hot the gulls are just standing around with their beaks open.


But Joe Al-Sorghali is still trying to get himself a fish dinner:


“Hopefully I can get a good amount of perch today… they’re not that fishy so they’re a really good catch.”


It takes a lot of these little fish to fill up a dinner plate. But that doesn’t stop Al-Sorghali from going after perch and walleye any chance he gets. A lot of people call Lake Erie the Walleye Capital of the World.


Fishing is a really big deal here. So it makes sense that Lake Erie’s also home to the Fish Detectives.


(Dragnet theme music)


The fish detective headquarters is tucked away on the edge of a quiet cove. The investigators at the Lake Erie Center are not wearing trench coats. They’re not even wearing lab coats. This crew of laid-back lab techs and grad students comes to work in jeans and T-shirts.


Carol Stepien heads up the fish detective squad. She says they solve lots of cases of mistaken identity.


Take the Case of the Fried Perch.


Last year the detectives got a call from a TV station in Milwaukee. The news crew was suspicious that the fried local perch on restaurant menus wasn’t really local.


Stepien says she asked the news station to send her some frozen filets.


“So instead they sent their news crew out into restaurants and had their news crew eat the fish and put a little bit of the breaded, cooked fish in a plastic bag and froze those and sent them to me. We were pretty shocked to get those in our laboratory. We didn’t know if we could get DNA from breaded, fried material like that.”


But Stepien says they scraped off the breaded coating… and they actually were able to extract DNA from the little bits of cooked fish.


“And we found that about half of those fish were yellow perch from Europe.”


Stepien says it’s gotten more common for fish brokers to import yellow perch from outside the U.S. because it’s cheaper. She says even though the foreign perch might taste the same when they’re deep-fried… a close look at the DNA of the European yellow perch reveals big differences from Great Lakes yellow perch.


“They probably could be called freshly caught lake perch, but they were certainly frozen and didn’t come from any local lakes, they didn’t come from the Great Lakes. Instead they came from overseas.”


Stepien’s team will tackle any sort of mystery, as long as it involves gills and fins.


Lately they’ve solved cases of home invasion. That is, invasions by exotic species that’ve gotten into the Great Lakes. The scientists can track the invaders by their DNA fingerprints, and find out where they’ve been.


Joshua Brown is a Ph.D student at the lab. He’s been tracking the round goby. It’s a fish native to Europe. Scientists say it caught a ride to the Great Lakes in the ballast tanks of ocean going ships. It’s been crowding out native species.


“We’re going to find somebody to point the finger at, as it were. We’ve found evidence they came from the northern portion of the Black Sea, right around one of the major ports.”


That port is in Ukraine. Even though they’ve found the culprit, Brown says there’s not much governments can do, because everyone’s guilty.


“I don’t think you could really sue a nation for you know, not keeping their species under wraps. If so, we’d be open for a lot of lawsuits too – we export almost as many as we import.”


But Brown says knowing exactly where a foreign species comes from might help keep the door closed to future invaders from that same region.


Whether it’s a case of consumer fish fraud or defending the home turf from invaders, there’s one bottom line for these detectives. They want to find out as much as they can about native fish so they can keep them from going belly up.


For The Environment Report, I’m Rebecca Williams.

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Dupont to Conduct Studies on C-8

Most Americans have a trace amount of the chemical C-8 in their blood, and no one knows where it comes from. But the DuPont Company is going to conduct studies that could solve the mystery as part of a settlement with the U.S. Environmental Protection Agency. The Great Lakes Radio Consortium’s Fred Kight has the story:

Transcript

Most Americans have a trace amount of the chemical C-8 in their blood,
and no one knows where it comes from, but the DuPont Company is
going to conduct studies that could solve the mystery as part of a
settlement with the U.S. Environmental Protection Agency. The Great
Lakes Radio Consortium’s Fred Kight has the story:


DuPont spokesman Cliff Webb says the company will spend five million
dollars to investigate the potential breakdown in the environment of C-8,
a key ingredient in Teflon and other non-stick materials.


“We’ll hire independent third parties to serve as a panel administrator for
peer review and consultation, and then the panel will address any specific
activities and findings they see as a result of the study, and the public
will have an opportunity to nominate also a panel member.”


Webb says the three year study will focus on nine chemicals or products
that could release C-8, but he won’t divulge what they are, explaining
they’re confidential business information.


An EPA advisory group has concluded that C-8 is a “likely carcinogen,”
but DuPont disputes that.


Under the settlement agreement, DuPont also must pay a record fine of
more than 10-million dollars for failing to disclose C-8 data to regulators.


For the GLRC, I’m Fred Kight.

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Invasive Fish Rears Ugly Head in Great Lakes

  • With its ability to breathe out of water and wriggle its way over land during dry spells, the media has dubbed the northern snakehead "Frankenfish." Its appearance in Lake Michigan is scary to scientists. (Photo courtesy of USGS)

A few weeks ago, a Chicago fisherman caused a stir when he found a northern snakehead fish. The discovery set off a frantic search to find out if yet another invasive species is threatening the Great Lakes. The Great Lakes Radio Consortium’s Jenny Lawton has this report:

Transcript

A few weeks ago, a Chicago fisherman caused a stir when he found a northern snakehead fish. The find set off a frantic search to find out if yet another invasive species is threatening the Great Lakes. The Great Lakes Radio Consortium’s Jenny Lawton has this report:


Just before Halloween, the so-called Frankenfish reared its ugly head… filled with sharp teeth… in Chicago’s Burnham Harbor on Lake Michigan. And it’s still a mystery as to just how it got there.


Although the snakehead is arare item in some Asian cuisines, there’s a more common suspicion amongst local experts and hobbyists. That snakehead was probably a pet that outgrew its tank, and instead of the traditional farewell down the toilet, it was set free in Lake Michigan. Free to eat through the Lake’s food web.


Local pet store manager Edwin Cerna says that’s why he stopped selling the fish years before they were banned by U.S. Fish and Wildlife. He remembers one day, when he was adjusting a tank, he accidentally got in between a snakehead’s lunch and its mouth.


“He bit me in the hand… made me bleed. It hurts. It’s got a nice strong jaw and that’s why it’s so dangerous because it can kill big fish, literally cut them in half. It’s almost like a big old killer whale, like a miniature version of it.”


But why on earth would anybody buy a vicious fish that can grow up to three feet long in the first place? Jim Robinett is with the Shedd Aquarium in Chicago. He says he’s a fish geek.


“I gotta say, as a little fish, when you first buy them, they’re really attractive; they’re neat little animals, but they eat like crazy. They’re voracious.”


Robinett knows not to be fooled by the little guys because what happens next is the perfect plot for a B-horror movie. He says the snakehead fish grows quickly, eventually eating everything in its tank. If it doesn’t die from overgrowing that tank, its owner might be tempted to dump it into a nearby body of water where it will keep eating its way up the food chain. Robinett says that’s the fear in Lake Michigan.


“They could potentially start picking off small salmon and lake trout, which is native to these waters here, they’re not real discriminating, they’ve been known to take things as large as frogs, some small birds, even small mammals that happen to get in the way there close to shore. They’ll eat anything they get their mouth on.”


Most hobby fish don’t last long in Chicago’s cold water. But the northern snakehead is different. The snakehead is native to northern Asia, and the Lake Michigan Federation’s Cameron Davis says that makes the fish feel right at home around here.


“It’s a lot like us Midwesterners, it just kind of hunkers down and… that’s part of the problem with the snakehead is that it can live under very extreme conditions. Which means it’ll out compete those other fish, and that’s a tremendous problem.”


Snakeheads have another edge on other species. The fish guard their eggs, giving their young a better chance of reaching maturity. But perhaps the most peculiar thing about snakeheads is that they can breathe. In addition to its gills, they have an organ that works like a lung and allows it to breathe air. It’s able to live up to three days as it uses its fins to wriggle across land in search of another body of water.


But looking down into the murky waters at Burnham Harbor, Davis says we shouldn’t run screaming yet. It’s not exactly a horror film scenario.


“I don’t think that the snakehead is going to come and grab our children out of schools and eat them or anything like that. But it is a problem for those of us who like to fish for yellow perch and whitefish and some of the things that make the Great Lakes so fantatstic, could really be threatened by this fish getting into Lake Michigan.”


Other invasive species cause an estimated 137-billion dollars of losses and damages in U.S. waterways each year. Cameron Davis says simply banning the local sale of fish like snakeheads hasn’t been enough to keep the Great Lakes safe.


“We’ve got to stop imports of these kinds of fish into the United States. We can’t protect the Great Lakes unless we’re checking these things at the door when they come into the country. It’s that simple.”


Davis is pushing for the passage of the National Aquatic Invasive Species Act. The bill would allocate a total of 174-million dollars to develop new technology for identifying and eliminating the invaders if and when they arrive.


So far, local authorities ahven’t found another snakehead near the banks of Lake Michigan, but Cameron Davis says the initial find just proves how hard it is to regulate what comes into the country’s largest body of fresh water.


Standing on the dock at Burnham Harbor, Davis looks out over the dark waters and shakes his head.


“It’s just an indicator that we’re in a race against time right now. Let’s hope that if there are more than one out there, that they haven’t hooked up.”


If they have, he says, it could truly be the stuff horror movies are made of… at least, for the other fish in the Great Lakes.


For the Great Lakes Radio Consortium, I’m Jenny Lawton in Chicago.

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Holy Grail of Great Lakes Shipwrecks Found?

  • For a long time, anything any diver salvaged could be claimed as his or her own. Since the Abandoned Shipwreck Act of 1987, anything divers find on public land remains public. But a new discovery may bend some rules. (Photo courtesy of NOAA)

A shipwreck hunter believes he might have found what’s been described as the Holy Grail of Great Lakes wrecks. His find has triggered a new debate over who can lay claim to historic shipwrecks and what should happen to them. The Great Lakes Radio Consortium’s Sally Eisele reports:

Transcript

A shipwreck hunter believes he might have found what’s been described as the Holy Grail of Great Lakes wrecks. His find has triggered a new debate over who can lay claim to historic shipwrecks and what should happen to them. The Great Lakes Radio Consortium’s Sally Eisele reports:


Of the thousands of shipwrecks in the Great Lakes, the wreck of the Griffin is probably the most legendary. For a few reasons. She was built by somebody legendary – French explorer Rene-Robert Cavalier Sieur de La Salle, she was the first European ship to sail the Upper Great Lakes… and she was the first to sink. Actually, she sank on her maiden voyage in 1769, not exactly one of La Salle’s bigger success stories. But the mystery she left behind is pretty big – and it has pretty well flummoxed Great Lakes historians for hundreds of years. Shipwreck scholar Steven Herald is the director of the Manistee County Historical Museum.


“The Griffin loaded its first and only freight cargo downbound at Green Bay, and there has never been a reliable report of anyone who has seen the vessel since. It left Green Bay and disappeared totally.”


Did she run aground? Sink to the bottom of Lake Michigan? No one knows, But Steven Libert, a long-time shipwreck hunter, thinks he might have found a clue. What he’s excited about appears to be a long, wooden pole sticking out of the sand in about 80 feet of water in northwestern Lake Michigan. It doesn’t look like much. But Rick Robol, the attorney for Libert’s company Great Lakes Exploration, says tests indicate it could date back to the 17th century. And it could be part of a ship.


“Great Lakes Exploration does not know at this point what is there. And it does not know whether in fact it is the Griffin or not. Certainly if it were the Griffin, it would be a very substantial find.”


Great Lakes Exploration has filed suit in federal court seeking salvage rights to the site. But the site is in Michigan waters and the state has filed a motion to have the case dismissed. State archaeologist John Halsey says whatever there is should belong to the public, not a private company.


“They have the money to go out and look, they have the money to go out and find, but what they don’t have is the permission to bring stuff up. That’s where the rubber meets the road.”


The state argues the Federal Abandoned Shipwreck Act of 1987 gives any state title to historic wrecks in its waters. Before its passage, pretty much anybody in a rubber suit could salvage shipwrecks. And they did – the evidence is rusting out in garages across the country. The federal law sought to protect these historic sites – which, in the cold fresh water of the Great Lakes, are often well-preserved time capsules. But Wisconsin shipwreck researcher, Brendon Baillod, says a number of cases have already shown the law is full of technical loopholes if you have the money and time to challenge it.


“We have a lot of wrecks that are open game legally. It really is up to the judge who gets the case before them.”


If Great Lakes Exploration does clear the legal hurdles, the next question will be academic. What should happen to their findings? Attorney Rick Robol says it all depends on what’s there.


“Really, shipwrecks have to be dealt with on a case by case basis. There are some shipwrecks that may best remain in situ, that is, on site, and there are other that should be recovered. It’s impossible to determine what’s best for a particular wreck without first scientifically studying it.”


At this stage, it’s anybody’s guess as to whether the site contains the remains of a ship or just a pile of very old scrapwood. But preservationists such as historian Steven Herald, argue anything of historical value should really just be left there.


“I’m a great one for leaving it where it is and studying it in as much detail as possible. The easiest way to preserve it is to keep it there.”


One thing is certain, any excavation would likely involve many years and millions of dollars. Oh, and there’s another possibility too, if in fact the Griffin is found. Technically, the vessel still belongs to France, which was in charge around here after all at the time of La Salle’s adventures.


For the Great Lakes Radio Consortium, I’m Sally Eisele.

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The Allure of Cicadas

This year, cicadas are re-emerging in many parts of the eastern United States. While not really locusts, they are considered a plague by some people. The Great Lakes Radio Consortium’s Jim Blum goes beyond the backyard to find out there is little to fear:

Transcript

This year, cicadas are re-emerging in many parts of the eastern United States.
While not really locusts, they are considered a plague by some people. The
Great Lakes Radio Consortium’s Jim Blum goes beyond the backyard to find out
there is little to fear:


(sound of cicadas)


Reporter Jim Blum: “I’m Jim Blum with naturalist Dan Best. Seventeen years ago this
month, Magicicada septemdecula and other species of periodic cicadas rose out
of the ground to lay eggs. Then, and now, and likely 17 years from now,
communities will expect a disaster. Dan, is it?”


Naturalist Dan Best: “No, I wouldn’t call it a disaster. Tremendous
natural phenomenon, yes, but disaster, no. Anytime you have large, big buzzy insects
around, people tend to get shook up, whether it’s bumblebees or dragonflies, but
especially when something shows up in prodigious numbers like these cicadas.”


JB: “Now, unlike a large outbreak of gypsy moths, the periodic cicadas don’t
actually eat the leaves.”


DB: “No, that’s right. The damage we are likely to see is the result of
female cicadas laying eggs.”


JB: “How?”


DB: “Well, they have a structure called an ovipositor, and in the end of a
twig they will use this like a little saw to make slits in the twig where they
will lay their eggs inside of that.”


JB: “How will that be apparent to us?”


DB: “Well, the twig will split as a result of several of these little egg laying
gouges in the twig, and from that point the twig may die, or the end of the
branch. And so you’ll notice withered brown leaves at the tips of branches.”


JB: “And that’s what they recognize as ‘flagging?'”


DB: “That’s the term.”


JB: “Now, what size trees are going to be affected?”


DB: “Branches or twigs that are half-inch in diameter or smaller. So on
big, mature trees that’s just the outer growth, no big deal. The trees
that are more vulnerable are the young trees, where literally all the
branches are that size.”


JB: “If this is not a disaster, what is it?”


DB: “I think it’s a tremendous natural phenomenon to experience. It only
occurs like a comet or a blue moon, and perhaps even less frequently than that.
You don’t want to miss it.”


(guitar music)


JB: “Now what’s a good time to see this emergence?”


DB: “Evening, just after dark. You’ll see the holes before the actual
emergence. And then, as they emerge, they’ll be coming up and you’ll see
them all over small trees. The edge of the woods is a good place to see
it.”


JB: “From the pictures I’ve seen, and from what I remember from 17 years ago,
the periodic cicada, bumblebee sized, black, orange eyes and wings. Do
they look like this when they come out of the ground?”


DB: “No, they don’t. What comes out of the ground are the nymphs, the
golden brown color, and no wings at all. Then they make their way up a tree
trunk or out on a branch, and this exoskeleton that they have splits open and
out emerges the adult which is a creamy white color with red eyes and a
couple of big black patches on it.”


JB: “Dan, are these cicadas going to be everywhere?”


DB: “Well, they are not going to be popping out of every square foot of ground in
the area, but there will be kind of a spotty emergence. But very heavy in
some places.”


JB: “If the visual spectacle of the emergence for some reason, doesn’t happen in my yard,
will I have missed out on the experience?”


DB: “No, because it’s almost impossible to escape what comes next.”


(sound up of cicadas)


DB: “The sound is an overwhelming, even annoying, series of buzzes and ticks.”


JB: “How do they make this noise?”


DB: “This loud noise is created by the males to attract the females. The
males vibrate two drum-like membranes to create the sound, which is then
resonated or amplified by a hollow chamber in their body.”


JB: “Not unlike the sound box of a guitar.”


DB: “That’s right.”


(strumming on guitar)


JB: “How long will we hear them?”


DB: “We’ll here this noise during the month of June and be over by about the
Fourth of July.”


JB: “About the same time that the annual or dog days cicadas show up.”


DB: “That’s right, that we’ll here during the hot days of July and August.”


JB: “Now why are those called annual cicadas?”


DB: “Well, unlike the 17-year cicada, which emerges from a single brood in
our area, we have several broods of these annual cicadas which have a much
shorter cycle in the ground. So every year, one way or the other, we have
annual cicadas.”


JB: “Why 17?”


DB: “Jim, I can’t tell you, I don’t know, it’s just one of those great mysteries
of nature.”


JB: “That’s naturalist Dan Best, and I’m Jim Blum, for the Great Lakes Radio
Consortium.”

(cicadas fade out)

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