Saving Seafood

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 The sugar kelp had declined dramatically and been replaced by invasive, shrub-like seaweed that looked like a giant shag rug.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

Fishing Partnership Support Services: Pass a price on carbon to protect fisheries and livelihoods

July 31, 2017 — A few years ago, scientists, fishermen and fishing managers concluded that cod stocks were rebuilding off the coast of Massachusetts. This understanding led ground fishermen (those who catch cod and other groundfish) spanning coastal New England to invest their life savings into their fishing businesses.

Soon after, industry experts changed their tune, reporting that drastic changes were underway. With livelihoods and families on the line, cod stocks began collapsing, leaving thousands devastated both financially and mentally. Today, an astounding 87 percent of Massachusetts ground fishermen suffer from mild to severe PTSD after experiencing the financial consequences of the crash, according to a Northeastern University study.

The situation only worsens as fishermen resort to unsafe practices — going farther out to sea in subpar boats, downsizing crews, and working longer hours on insufficient sleep. It is no surprise that New England ground fisherman are 200 times more likely to die on the job than the average worker, and that fishermen have the highest suicide rates among U.S. workers.

With ocean temperatures in the Northeast increasing more rapidly than global averages, sea animal populations are already noticeably shifting. Populations of cod, lobster, sea bass, and many others are decreasing in size or migrating farther north. And in turn, food chains are altered and fishermen struggle to pay the bills.

From cod to fishermen to families, climate change has the power and potential to cause true devastation, and the time to act is now. In Massachusetts, we have the opportunity to confront this issue head-on and cut greenhouse gas emissions through carbon pricing legislation H.1726 and S.1821.

Read the full option piece at the New Bedford Standard-Times

Ocean Warming Is Already Affecting Arctic Fish And Birds

September 13, 2016 — Up until a few years ago, mackerel were unknown in Greenland’s cold waters. The small oily fish typically spawned west of the British Isles and then migrated toward the northeast along the Norwegian current to feed for the summer. But in 2007, they began to show up in large numbers in the Irminger Current around Iceland. On the ocean highway, where they once turned right, they now turned left.

By 2011, the mackerel had found their way into Greenlandic waters, prompting the launch of a new fishery. Three years later, the mackerel fishery made up 23 percent of Greenland’s export earning, an “extreme example of how climate change can impact the economy of an entire nation,” Teunis Jansen, a researcher at the Technical University of Denmark, said in a release.

The mackerel aren’t the only species being affected by warmer oceans. Soaring temperatures have pushed entire groups of species toward the poles, caused increases in disease in plants and animals and changed weather patterns, according to a report launched this week by the International Union for Conservation of Nature (IUCN). Marine species are moving northward at a rate roughly five times faster than the migration of land animals.

The report, released during the IUCN World Conservation Congress in Hawaii, highlights the impacts of ocean warming on marine life, from microorganisms to mammals. Eighty scientists from a dozen countries worked on the report, considered to be the most comprehensive collection of research on the planet’s warming oceans.

Truly Staggering

“We were astounded by the scale and extent of ocean warming effects on entire ecosystems made clear by this report,” said Dan Laffoley, an IUCN marine adviser and one of the report’s lead authors.

The world’s oceans have acted as a buffer against climate change. A “staggering 93 percent” of the heat produced by human activities has been absorbed by the world’s oceans, Laffoley said. If the heat had entered the atmosphere instead of the oceans, the Earth would have warmed not by the 1C (1.8F) we have already experienced, but by 36C (64.8F). “Up to now, the ocean has shielded us from the worst impacts of climate change,” the report’s authors write.

Read the full story at the Huffington Post

Is global warming causing marine diseases to spread?

March 29, 2016 — PORTLAND, Maine –Global climate change is altering the world’s oceans in many ways. Some impacts have received wide coverage, such as shrinking Arctic sea ice, rising sea levels and ocean warming. However, as the oceans warm, marine scientists are observing other forms of damage.

My research focuses on diseases in marine ecosystems. Humans, animals and plants are all susceptible to diseases caused by bacteria, viruses, parasites and fungi. Marine diseases, however, are an emerging field.

Infectious agents have the potential to alter ocean life in many ways. Some threaten our food security by attacking important commercial species, such as salmon. Others, such as bacteria in oysters, may directly harm human health. Still others damage valuable marine ecosystems – most notably coral reefs.

To anticipate these potential problems, we need a better understanding of marine diseases and how climate change affects their emergence and spread.

Read the full article at the Portland Press Herald