Saving Seafood

Do River Channels Always Change When Dams Are Removed? It Depends

September 8, 2020 — The following was released by NOAA Fisheries:

Dams are constructed for many purposes, including energy generation, water supply, flood control, and recreation. Dams can also impact the environment, both when they’re built and again when they’re removed. Researchers from the University of Maine, U.S. Geological Survey, and NOAA collaborated to determine what happens to the shape of rivers when a dam is removed. They found that the changes can be minimal under specific geologic and site conditions.

For more information about this study read our web story or the online journal article.

Will Klamath River Salmon Thrive Again After Dams Are Gone?

November 23, 2016 — Year after year, volunteers return to tributaries of the Klamath River, just like the fish they’re trying to help do the same thing.

Jimmy Peterson, a fisheries project coordinator for the Mid-Klamath Watershed Council, places rocks and stones to make fish passages in Fort Goff Creek, 60 miles up from the river’s mouth on California’s North Coast.

“This creek has extremely awesome habitat up top here,” Peterson says. “Extremely awesome.”

Then he translates: “The water stays really cold and there’s plenty of nice spawning gravel that go up fairly far into the watershed. There’s not a lot of human activity up there either, so it’s fairly untouched.”

Scientists estimate that a century ago, hundreds of thousands of coho may have run up the Klamath’s streams and tributaries. Now it’s a few thousand. Federal and private grants fund the council’s work, helping coho access “extremely awesome” habitat because coho are threatened with extinction.

Dams aren’t the only reason salmon, trout and other fish need help on the Klamath. But they are a big one. The promise of dam removal is free passage for fish up to cooler spots and native headwaters. And the Klamath River, near California’s northern border, may become the next big western river to see that happen. Federal energy regulators are considering a plan that would open hundreds of miles of the Klamath to the potential of the largest river restoration in U.S. history.

Read the full story at KQED

MAINE: Taking Down Dams and Letting the Fish Flow

October 24, 2016 — BANGOR, Maine — Joseph Zydlewski, a research biologist with the Maine Cooperative Fish and Wildlife Research Unit of the United States Geological Survey, drifted in a boat on the Penobscot River, listening to a crackling radio receiver. The staccato clicks told him that one of the shad that his team had outfitted with a transmitter was swimming somewhere below.

Shad, alewives, blueback herring and other migratory fish once were plentiful on the Penobscot. “Seven thousand shad and one hundred barrels of alewives were taken at one haul of the seine,” in May 1827, according to one historian.

Three enormous dams erected in the Penobscot, starting in the 1830s, changed all that, preventing migratory fish from reaching their breeding grounds. The populations all but collapsed.

But two of the dams were razed in 2012 and 2013, and since then, fish have been rushing back into the Penobscot, Maine’s largest river.

“Now all of a sudden you are pulling the cork plug and giving shad access to a truckload of good habitat,” Dr. Zydlewski said. Nearly 8,000 shad have swum upstream this year — and it’s not just shad.

More than 500 Atlantic salmon have made the trip, along with nearly two million alewives, countless baby eels, thousands of mature sea lamprey and dozens of white perch and brook trout. Striped bass are feeding a dozen miles above Bangor in waters closed to them for more than a century.

Nationwide, dam removals are gaining traction. Four dams are slated for removal from the Klamath River alone in California and Oregon by 2020.

Just a few of these removals have occurred on such large rivers, which play an outsize role in coastal ecosystems. But the lessons are the same everywhere: Unplug the rivers, and the fish will return.

Read the full story at the New York Times

Feds: Habitat, dams, hatcheries keys to saving Maine salmon

April 4, 2016 — PORTLAND, Maine — The Gulf of Maine’s endangered salmon will need restored habitats, removal of dams, aggressive hatchery programs and other conservations actions if its population is to rebound, according to a federal government plan to save the fading and iconic fish.

The U.S. Fish and Wildlife Service has released a recovery plan for the Gulf of Maine salmon, listed as endangered in 2000, that is intended as a roadmap to sustainability for a fish whose populations have plummeted since the 1800s.

Recovery will take time and patience — the plan estimates 75 years and $350 million, which would have to come from some combination of federal, state and private money. The wildlife service estimates 100,000 adult salmon returned to the Penobscot River each year in the 19th century, and less than 750 of the fish returned to spawn in Maine rivers last year.

Maine’s salmon face numerous threats, and one of the biggest is the continued presence of dams that prevent them from spawning, said Dan Kircheis, a fisheries biologist with the National Marine Fisheries Service. He said there are 400 dams in the state in areas that affect salmon.

Read the full story from the Associated Press at The Gloucester Times

To Save Its Salmon, California Calls in the Fish Matchmaker

January 15, 2016 — HORNBROOK, Calif. — On a frigid morning in a small metal-sided building, a team of specialists prepared to orchestrate an elaborate breeding routine. The work would be wet and messy, so they wore waders. Their tools included egg trays and a rubber mallet, which they used to brain a fertile female coho salmon, now hanging dead on a hook.

Diana Chesney, a biologist, studied a piece of paper with a matrix of numbers, each one denoting a male salmon and potential match for the female coho.

“This is the bible,” she said of the matrix. “It’s what Carlos says.”

John Carlos Garza, a geneticist based a day’s drive south in Santa Cruz, has become a key figure in California’s effort to preserve its decimated salmon stocks. Using the latest genetic techniques, he and his team decide which individual fish should be bred together. At several major state conservation hatcheries, like the coho program here at Iron Gate, no two salmon are spawned until after Dr. Garza gives counsel — a “salmon mating service,” he jokingly calls it.

His painstaking work is the latest man-made solution to help fix a man-made problem that is about 150 years old: dams, logging, mining, farming, fishing and other industries have so fractured and polluted the river system that salmon can no longer migrate and thrive. In fact, today, owing to the battered habitat, virtually all salmon in California are raised in hatcheries.

Traditionally, the practice entailed killing fertile salmon and hand-mixing eggs and male milt, or sperm, then raising the offspring packed in containers or pools. When they were old enough to fend for themselves, they were released to rivers or sometimes trucked or ferried to release points to find the ocean on their own, a practice that gave them a necessary transition before they hit saltwater and a semblance of the quintessential salmon experience of migrating to the sea and back. To that end, they eventually swam back to hatcheries, where they became the next breeders in the cycle.

While hatcheries have helped propagate the species, they have also created new problems. The salmon they produce can be inbred and less hardy through domestication, hurting their chances for surviving and thriving in the wild.

Read the full story at The New York Times

MAINE: Costs, fish, property values are factors in the future of 3 Mousam River dams

December 29, 2015 — KENNEBUNK, Maine — A Kennebunk electric utility is weighing whether to remove the three lowest dams on the Mousam River or face potentially costly upgrades to restore fish passage to a river that once hosted large runs of spawning fish.

Trustees at Kennebunk Light & Power District have until March 2017 to decide whether to seek federal relicensing of three dams that the nonprofit utility owns on the Mousam River or propose several alternatives for the facilities. One option under serious consideration – and being pursued by local conservationists and sportsmen – is the removal of some or all three of the dams, including the large Kesslen Dam located in the heart of downtown Kennebunk.

The Mousam River is the only major river system in Maine emptying into the Gulf of Maine that lacks any methods for fish such as American shad, alewives or Atlantic salmon to bypass the dams, effectively blocking them from accessing more than 300 miles of watershed. Removing the three dams would allow the lower 9 miles of the Mousam River to flow freely – although an additional 12 dams remain on the upper stretch of river – and is part of an intense river restoration push in Maine.

Read the full story at the Portland Press Herald

 

After a Century, Shortnose Sturgeon Return to Historic Habitat

November 17, 2015 — The following was released by NOAA Fisheries:

ORONO, Maine – Endangered shortnose sturgeon have rediscovered habitat in the Penobscot River that had been inaccessible to the species for more than 100 years prior to the removal of the Veazie Dam in 2013. University of Maine researchers confirmed evidence that three female shortnose sturgeon were in the area between Veazie (upriver of the dam remnants) and Orono (Basin Mills Rips), Maine in mid-October. Researchers had previously implanted these sturgeon with small sound-emitting devices known as acoustic tags to see if they would use the newly accessible parts of the river.

Among the most primitive fish to inhabit the Penobscot, sturgeon are often called “living fossils” because they remain very similar to their earliest fossil forms. Their long lives (more than 50 years) and bony-plated bodies also make them unique. Historically, shortnose sturgeon and Atlantic sturgeon (a related species also present in the watershed) had spawning populations in the Penobscot River as far upstream as the site of the current Milford dam, and provided an important food and trade source to native peoples and early European settlers. Overharvest and loss of suitable habitat due to dams and pollution led to declines in shortnose sturgeon populations and a listing as endangered under the U.S. Endangered Species Act (ESA) in 1967. In 2012, Gulf of Maine populations of Atlantic sturgeon were listed as threatened under the ESA.  

Today, a network of sound receivers, which sit on the river bottom along the lower river from Penobscot Bay up to the Milford Dam, detect movement and location of tagged fish. According to Gayle Zydlewski, an associate professor in the University of Maine School of Marine Sciences, the three individual fish observed were females. These fish have since been tracked joining other individuals in an area identified as wintering habitat near Brewer, Maine. Wintering habitat in other rivers is known to be staging habitat for spawning the following spring.

“We know that shortnose sturgeon use the Penobscot River throughout the year, and habitat models indicate suitable habitat for spawning in the area of recent detection upriver of Veazie, although actual spawning has not yet been observed,” Zydlewski said.

Since 2006, Zydlewski has been working with Michael Kinnison, a professor in UMaine’s School of Biology and Ecology, and multiple graduate students, including Catherine Johnston, to better understand the sturgeon populations of the Penobscot River and Gulf of Maine. Johnston, who has been tagging and tracking sturgeon in the Penobscot for two years to study the implications of newly available habitat to shortnose sturgeon, discovered the detections of sturgeon upstream of the Veazie dam remnants. Each new bit of information adds to the current understanding of behavior and habitat preferences of these incredible fish. 

“We’re very excited to see sturgeon moving upstream of where the Veazie Dam once stood, and into their former habitats,” said Kim Damon-Randall, assistant regional administrator of the National Oceanic and Atmospheric Administration (NOAA) Fisheries’ Protected Resources Division. “We need to do more research to see how they’re using it, but it’s a tremendous step in the right direction.”

Habitat access is essential for the recovery of these species. The removal of the Veazie Dam is only a portion of the Penobscot River Restoration Project, which, when combined with the removal of Great Works Dam in 2012, restores 100 percent of historic sturgeon habitat in the Penobscot. In addition to dam removals, construction of a nature-like fish bypass at the Howland Dam in 2015 significantly improves habitat access for the remaining nine species of sea-run fish native to the Penobscot, including Atlantic salmon and river herring.   

“Scientific research and monitoring of this monumental restoration effort has been ongoing for the past decade,” said Molly Payne Wynne, Monitoring Coordinator for the Penobscot River Restoration Trust. “The collaborative body of research on this project is among the most comprehensive when compared to other river restoration projects across the country,” Wynne said.

NOAA Fisheries is an active partner and provides funding for this long-term monitoring collaboration that includes The Penobscot River Restoration Trust, The Nature Conservancy and others. These efforts are beginning to shed light on the response of the river to the restoration project. Restoration of the full assemblage of sea-run fish to the Penobscot River will revive not only native fisheries but social, cultural and economic traditions of Maine’s largest river.

After measurement and implantation of a small tagging device, graduate student L. Izzo releases a shortnose sturgeon back into the Penobscot (ESA Permit #16036 compliant, photo courtesy G. Zydlewski).

 

In the Dry West, Waiting for Congress

November 6, 2015 — KLAMATH FALLS, Ore. — Drought in the West is an ugly thing. Rivers trickle away to nothing, fires rage, crops fail, ranchers go broke, tribal people watch fish die. As Westerners fight over the little water left, tempers crack, lawsuits fly and bitterness coats whole communities like fine dust.

As the climate warms, the West gets meaner.

The Klamath River begins in southern Oregon and meets the Pacific Ocean among the redwoods in Northern California, draining nearly 16,000 square miles. Until recently, who got water and how much had been deeply contentious issues. In particular, the irrigators and the Indian tribes were angry at one another, and the users in the river’s upper basin were angry with users in the lower basin.

But in recent years, something changed. Hostility gave way to compromise. Just about everybody who wants some of that precious river flow has made nice, given and taken, sat down and compromised.

Three major agreements have been wrapped up in Senate Bill 133, introduced by Senator Ron Wyden, Democrat of Oregon, and several colleagues. The bill is supported by tribes that want to protect the fish; ranchers who want to feed their cattle; farmers who grow alfalfa and potatoes; fly fishermen and duck hunters; ecologists; a power company; and many local politicians of various ideological stripes.

Canadian eel tracked on 2,400-kilometre migration to Sargasso Sea

October 27, 2015 — It’s a mystery that has puzzled scientists for a century — how swarms of baby eels appear in the Sargasso Sea near Bermuda when adults have only been found in faraway places like Canada’s St. Lawrence River.

For the first time, Canadian researchers have tracked an adult female eel from Nova Scotia all the way to the northern edge of the Sargasso Sea with a satellite tracker — a 45-day journey of about 2,400 kilometres, described in a new paper published today in Nature Communications.

If they can confirm the path taken by that eel is the typical migration route used by Canadian eels, that may help scientists figure out measures that could be taken to conserve the endangered fish.

American eels, known by the scientific name Anguilla rostrata, are found in watersheds from Venezuela in the south to Greenland in the north, says Julian Dodson, a University of Laval researcher who co-authored the new paper.

In Canada, they historically lived throughout the St. Lawrence Seaway and Great Lakes, although their populations have fallen dramatically in the past 20 years, largely because of fishing and hydroelectric dams that they have trouble crossing.

Males typically live further south than females.

Read the full story at CBC News

Gulf of Maine’s cold-craving species forced to retreat to deeper waters

October 27, 2015 — For 178 years, dams stood across the Penobscot River here, obstructing salmon and other river-run fish from reaching the watershed’s vast spawning grounds, which extend all the way to the Quebec border.

Now, two years after the dam’s removal, the salmon’s proponents fear the fish face a more fearsome threat: a warming sea.

In recent years, the Gulf of Maine has been one of the fastest-warming parts of the world’s oceans, and climate change models project average sea surface temperatures here to increase by another 5.5 degrees Fahrenheit by 2065, a development that could extirpate Atlantic salmon and other cold-loving species, many of which already find Maine at the southern edge of their ranges.

“We’re all for taking down the dams and all the things that are going on to restore habitat, but how much are they looking at the evidence?” asks Gerhard Pohle of the Huntsman Marine Science Center in St. Andrews, New Brunswick, co-author of a study predicting how the changes are likely to affect 33 commercial species over the next 75 years. “Distribution of salmon in the Gulf of Maine would be such that there wouldn’t be many left at all.”

The warming gulf is already presenting challenges to many of its cold-loving denizens. Scientists at the National Marine Fisheries Services, or NMFS, have recorded the steady retreat of a range of commercially or ecologically important fish species away from the Maine coast and into deep water in the southwestern part of the gulf, where bottom water temperatures are cooler.

The retreat, which intensified over the past decade, includes cod, pollock, plaice, and winter and yellowtail flounder. Other native species that once ranged south of Long Island – lobster, sand lance and red hake – have stopped doing so, presumably because the water there is now too warm.

“You can imagine that when you have species at the southern end of their ranges, they will be really sensitive to these changes,” says Michael Fogarty, chief of the Ecosystem Assessment Program at the NMFS Northeast Fisheries Science Center in Woods Hole, Massachusetts. “They will either shift distribution or their survival rates might change.”

Read the full story at Portland Press Herald