Saving Seafood

Marine heatwaves are getting hotter, lasting longer and doing more damage

June 1, 2018 — On land, heatwaves can be deadly for humans and wildlife and can devastate crops and forests.

Unusually warm periods can also occur in the ocean. These can last for weeks or months, killing off kelp forests and corals, and producing other significant impacts on marine ecosystems, fishing and aquaculture industries.

Yet until recently, the formation, distribution and frequency of marine heatwaves had received little research attention.

Long-term change

Climate change is warming ocean waters and causing shifts in the distribution and abundance of seaweeds, corals, fish and other marine species. For example, tropical fish species are now commonly found in Sydney Harbour.

But these changes in ocean temperatures are not steady or even, and scientists have lacked the tools to define, synthesize and understand the global patterns of marine heatwaves and their biological impacts.

At a meeting in early 2015, we convened a group of scientists with expertise in atmospheric climatology, oceanography and ecology to form a marine heatwaves working group to develop a definition for the phenomenon: A prolonged period of unusually  at a particular location for that time of the year. Importantly, marine heatwaves can occur at any time of the year, summer or winter.

Read the full story at PHYS

 

Where’s the kelp? Warm ocean takes toll on undersea forests

August 22, 2017 — APPLEDORE ISLAND, Maine — When diving in the Gulf of Maine a few years back, Jennifer Dijkstra expected to be swimming through a flowing kelp forest that had long served as a nursery and food for juvenile fish and lobster.

But Dijkstra, a University of New Hampshire marine biologist, saw only a patchy seafloor before her. The sugar kelp had declined dramatically and been replaced by invasive, shrub-like seaweed that looked like a giant shag rug.

“I remember going to some dive sites and honestly being shocked at how few kelp blades we saw,” she said.

The Gulf of Maine, stretching from Cape Cod to Nova Scotia, is the latest in a growing list of global hotspots losing their kelp, including hundreds of miles in the Mediterranean Sea, off southern Japan and Australia, and parts of the California coast.

Among the world’s most diverse marine ecosystems, kelp forests are found on all continental coastlines except for Antarctica and provide critical food and shelter to myriad fish and other creatures. Kelp also is critical to coastal economies, providing billions of dollars in tourism and fishing.

The likely culprit for the loss of kelp, according to several scientific studies, is warming oceans from climate change, coupled with the arrival of invasive species. In Maine, the invaders are other seaweeds. In Australia, the Mediterranean and Japan, tropical fish are feasting on the kelp.

Read the full story from the Associated Press at Boston.com

Kelp Farming Promises Economic and Ecological Benefits

May 9, 2017 — We tend to think of spring as planting time, but kelp farmers in the Gulf of Maine are in the midst of their annual harvest right now. Growers and ocean researchers say kelp could be a huge win-win-win – improving the local environment, boosting other fisheries, and all while providing a saleable food source.

Ten  years ago, there were no kelp farms in the northeast. Now, there are more than a dozen. So, what gives?

“I think what’s been driving the increase is that the demand for domestically produced seaweed is rapidly growing in the U.S., principally due to American consumers’ increased awareness of the quality of waters where some of their [imported] seaweed may be coming from,” said Paul Dobbins, president of Maine-based kelp distributor Ocean Approved. “And the wild harvest, which has been going on for centuries here along the New England coast, can only provide so much.”

There’s also growing recognition among scientists that farmed seaweed can absorb excess nutrients and carbon dioxide, improving local water quality and boosting nearby fisheries, particularly shellfish. Nichole Price of Bigelow Laboratory for Ocean Sciences and Susie Arnold of Island Institute have been working with Dobbins to measure those benefits.

Read the full story at WCAI

How Seaweed Could Protect Your Oysters

September 14, 2016 — When you’re sitting at a raw bar feasting on oysters, the environment may be the furthest thing from your mind. But Washington state’s shellfish industry is threatened by a global problem – ocean acidification.

The oceans absorb about half of all human emissions of carbon dioxide. That extra carbon makes the water more acidic and interferes with the ability of clams, mussels, and oysters to build strong shells.

For help keeping the fishery productive, researchers are turning to an unexpected ally: a fast-growing type of seaweed called kelp.

Kelp absorbs carbon during photosynthesis. So Jan Newton of the University of Washington says scientists believe that growing and then removing kelp before it decays may take enough carbon out of the water to provide a better environment for shellfish. However …

Newton: “The oceans are extremely large, and this effect will be very much a localized effect.”

To test the approach, scientists began planting floating beds of kelp offshore this past spring. And over the next two years, Newton and her colleagues will monitor CO2 levels in the surrounding waters.

Read the full story from Yale University

Environmental Advocates, Fishermen At Odds Over Turning Cashes Ledge Into National Monument

February 2, 2016 — It’s clear from listening to fishermen that they’re ambivalent about the fisheries management process and the rules it produces. They feel like the rules are stacked against them, but they abide by the council’s decisions, because that is the process they have signed onto. The presidential order would fall outside that process.

Jackie Odell advocates for New England groundfishermen with the Northeast Seafood Coalition. She said the fisheries management process is public and transparent, and decisions are data-driven, goal-specific and reached through compromise.

“You know, there’s legislation that’s out there to protect this process,” she said. “And if we don’t want to use that process what are we doing and why? Why are all stakeholders — states, fishermen, NGOs, scientific community — all engaging in a process that in the end we are going to say, it doesn’t matter.”

But, she added, the fishing industry and environmental groups don’t have to be adversaries: Fishermen are also concerned about mining and natural gas exploration.

Witman, the longtime Cashes Ledge researcher, agrees.

“In the long run, I think we want the same thing. We both value a healthy resilient ocean that can support fisheries,” he said.

But the sticking point might be one of perspective.

Many fishermen, including Testaverde, entered this profession because it’s what their family had been doing for generations. They take immense pride in their work and their heritage. They fear a future in which their descendants won’t experience that.

Skerry, the photographer, fears a future in which one of Earth’s beautiful places is irrevocably damaged.

Read the full story at WBUR News

Seaweed can help feed the world – but will we eat it?

November 2, 2015 — Let’s say you want to farm.

And let’s say there is a crop that requires you to plant and harvest, but do very little in between. It needs no fertilizing, no weeding, no watering, and it has very few enemies in the form of pests or disease. It gets all it needs from the environment around it and, under optimal conditions, can grow almost six inches a day. It’s healthful for people, and it actually leaves the environment better than it finds it.

That’s the case in favor of seaweed, and it’s a case that Charlie Yarish, a professor in the department of marine sciences at the University of Connecticut at Stamford, has been making for nigh on half a century. They call him “Captain Seaweed.” I visited his lab, and I’m a believer.

Yarish has spent decades doing the work that brings an interesting idea – let’s farm seaweed! – to the point where growers can start viable farms. There are some 3,500 kinds of seaweed, and figuring out which kind to grow, and where, and how, is a big job. The first rule? “Always grow a species native to the water you’re growing in,” says Yarish. Because some seaweeds are wildly invasive, that’s an important point.

One of the farmers who has taken advantage of Yarish’s research is Paul Dobbins. He’s a co-owner of Ocean Approved, a company that farms sugar kelp off the coast of Maine and sells it frozen, rather than dried. In a kind of busman’s holiday (I farm oysters), I went out with him to take a look at the kelp. It was early spring, and most of his crop had already been harvested, but he still had a line or two in the water. We pulled up to the buoy that marked a line, and he reached into the water.

What he pulled into the boat was a remarkable abundance of plant. Sugar kelp gives magic beanstalks a run for their money: It can grow from seedling to 15 feet over one winter. In the process, it cleans the water by removing some of the nutrients that can lead to algae blooms. Along with shellfish, kelp is one of the few farmed foods with a positive environmental impact.

And it doesn’t consume much in the way of resources. There’s the gas for the boat. There’s the labor in planting, harvesting and processing. And that’s about it.

There are a couple of ancillary non-environmental benefits. Most shellfish farming takes place from spring through early winter, so a crop that can grow from early winter through spring is an excellent complement; it can use both the space and the labor in the off-season.

Read the full story at Portland Press Herald