Saving Seafood

We Know Plastic Is Harming Marine Life. What About Us?

May 16, 2018 — In a laboratory at Columbia University’s Lamont-Doherty Earth Observatory, in Palisades, New York, Debra Lee Magadini positions a slide under a microscope and flicks on an ultraviolet light. Scrutinizing the liquefied digestive tract of a shrimp she bought at a fish market, she makes a tsk-ing sound. After examining every millimeter of the slide, she blurts, “This shrimp is fiber city!” Inside its gut, seven squiggles of plastic, dyed with Nile red stain, fluoresce.

All over the world, researchers like Magadini are staring through microscopes at tiny pieces of plastic—fibers, fragments, or microbeads—that have made their way into marine and freshwater species, both wild caught and farmed. Scientists have found microplastics in 114 aquatic species, and more than half of those end up on our dinner plates. Now they are trying to determine what that means for human health.

So far science lacks evidence that microplastics—pieces smaller than one-fifth of an inch—are affecting fish at the population level. Our food supply doesn’t seem to be under threat—at least as far as we know. But enough research has been done now to show that the fish and shellfish we enjoy are suffering from the omnipresence of this plastic. Every year five million to 14 million tons flow into our oceans from coastal areas. Sunlight, wind, waves, and heat break down that material into smaller bits that look—to plankton, bivalves, fish, and even whales—a lot like food.

Read the full story at National Geographic

 

Zero Dollars for Marine Mammals?

February 27, 2018 — The future of marine mammals is at risk in U.S. waters. President Trump’s proposed budget for fiscal year 2019 would eliminate the Marine Mammal Commission. With an annual operating budget of $3.4 million, which comes to just over one penny per American per year, the Marine Mammal Commission has for 45 years been assiduously developing science and policy to protect seals, sea lions, dolphins, whales, dugongs and walruses. Through the 1972 Marine Mammal Protection Act (MMPA), Congress charged the commission with providing independent oversight of marine mammal conservation policies and programs being carried out by federal regulatory agencies. Obviously, with a proposed budget of zero dollars, it would be impossible to execute the federally mandated objectives of fostering sustainable fisheries (through the Magnuson-Stevens Fishery Conservation and Management Act [MSA]) and protecting endangered species (through the Endangered Species Act [ESA]).

Marine mammals are more than just lovable creatures. They are important components of productive marine and coastal ecosystems that overall generate $97 billion of the gross domestic product. Whales function as ecosystem engineers by cycling vital nutrients between deeper and surface waters in the oceans. Without this nutrient cycling, oceans would produce less plankton and phytoplankton, which would eventually mean less fish. Also, through complex food-web interactions, marine mammals help to regulate fish populations. For example, marine-mammal–eating killer whales (often called “transient” killer whales) will eat seals, a common predator of pelagic fish—enabling fish populations to stay high. This kind of interaction is called a trophic cascade and is very common in marine ecosystems.

Serving as an independent oversight body, the commission has the critical task of assessing the scientific validity and effectiveness of research conducted to meet the federal mandates of the MMPA, ESA and MSA. If we as a country can’t even protect the charismatic species, I worry for all the less adorable parts of nature. So we need to draw a line in the sand. In this era of “fake news,” maintaining this entity to guard against encroachments to science-based policymaking on is more valuable than ever.

Read the full story at the Scientific American

 

Susan Larsen: What’s causing right whale decline?

January 30, 2018 — There is no argument that the North Atlantic Right Whale is in dire straits. Dr. Mark Baumgartner, a biologist from the Woods Hole Oceanographic Institute, gave a compelling presentation on “The Plight of the Right Whale” this past Tuesday evening, Jan. 23, at the Vineyard Gazette office. Since it was advertised, it was well attended.

One point of interest was that the right whales were making a healthy comeback, a two-decade period of modest annual growth; the population rebounded from 270 living whales in 1992 to 483 in 2010. From 2010, the numbers began to decline rapidly, with 2017 being a particularly devastating year, a loss of 17 whales. Dr. Baumgartner stressed the main focus was on whale entanglements with snow crab and lobster gear, and the urgent measures needed to be taken immediately within the fishery. Massachusetts fishermen are leading the way with break away links at the base of surface buoys (to 600lbs in 2001), sink rope (mandated in 2003), gear reductions and seasonal gear restrictions in Cape Cod Bay. He also touched on ship strikes as being a cause of death. However, the Marine Mammal Commission stated on their website, “other potential threats include spills of hazardous substances from ships or other sources, and noise from ships and industrial activities.”

But what Dr. Baumgartner could not explain was the scarcity of food that these leviathans need to feed on and their low birth rate. He showed the audience slides on the Calanus finmarchicus, known as copepods and remarked that this type plankton, sought after by these whales, are basically comprised of fat, or as Dr. Baumgartner called them “buttersticks.” Each adult whale needs to consume between 1,000-2,000 a day to remain healthy. The birth rate has dropped 40 percent from 2010-2016 and all five calves that were born in 2017 were to older mothers. “Since about 2011, we’re not seeing those sub-adults and juveniles in Florida and the question is, well, where are they?” asks Jim Hain, senior scientist at Associated Scientist at Woods Hole. Scott Kraus, a marine mammalogist from the New England Aquarium in Boston says, “Females are having young just every 9 years or more, compared with every 3 years in the 1980’s.”

Perhaps the decline is linked to the environmental disaster on April 20, 2010, the Deep Water Horizon oil spill in the Gulf of Mexico. From April 20, 2010, to July 15, 2010, more than 200 million gallons of oil spilled into the Gulf followed by another one million gallons of Corexit, a dispersant mixture of solvents and surfactants that break down the oil into tiny droplets. It is documented that for 3 months, marine microorganisms have ingested these toxins, which are carried along the Gulf Stream, a strong underwater current that flows through the Gulf of Mexico, skirts around Florida, flowing between Cuba and up the Eastern seaboard. Since the right whale gives birth off the coasts of Georgia and Florida, could these toxic chemicals be part of their decline?  “The chemicals in the oil product that move up through the food web are a great concern for us,” said Teri Rowles, coordinator of NOAA’s marine-mammal health and stranding response program. It is also documented that female mammals including humans who have been in contact with these toxins have suffered from irregular menstrual cycles, infertility, miscarriages and stillborns, along with premature aging and other debilitating side effects. John Pierce Wise Sr., co-author of the 2014 study and head of the Wise laboratory of Environment and Genetic Toxicology at the University of Southern Maine says, “To put it simply, after a sudden insult like an oil spill, once it’s over, it takes a long time for the population effects to fully show themselves.” This same article states “research has shown that the calves of other baleen whales (other than Bryde’s whale) may be particularly vulnerable to toxins that build in their tissues.”

A letter dated Aug. 17, 2017, from the office of the Massachusetts Attorney General in “Reference for information and comments of the 2019-2024 National Outer Continental Shelf Oil and Gas Leasing Program,” refers to the Deepwater Horizon disaster and its “harm to coastal communities and marine environment” and “long ranging impacts on marine mammals. The impacts on sea turtles could span the Atlantic.” The letter also states, “from 2010 through September 2016, there were 43 significant oil spills.”

In an article dated Dec. 5, 2017, ecologist Peter Corkeron of NOAA’s Northeast Fisheries Center in Woods Hole at the North Atlantic Right Whale Consortium’s annual meeting, “They’re (female right whales) dying too young, and they’re not having calves often enough.” This study found the females are struggling to reproduce. Dr. Baumgartner is the president of the North Atlantic Right Whale Consortium.

Read the full letter at the Martha’s Vineyard-Times 

 

Whale research to highlight changes in gulf

November 2, 2017 — BAR HARBOR, Maine — Upcoming new research into the feeding habits of baleen whales in the Gulf of Maine – one of the fastest-warming bodies of water on the planet – could shed light on impacts of climate change on oceans worldwide.

The study of whale foraging ecology will be undertaken by members of College of the Atlantic’s Allied Whale marine mammal research program, in partnership with Cetos Research Organization, during a five-year project beginning in spring 2018.

Paired with data from a similar Allied Whale study done before temperatures began rising so dramatically in the gulf in 2004, this new research will give scientists their first broad picture of how the ocean’s top predators are adapting to a rapidly changing environment.

“The warming gulf has the potential to radically affect prey structure, and we have the control data from before the warming started to go by,” said Allied Whale Director Sean Todd, the Steven K. Katona Chair in Marine Science at COA and a principal investigator on the project.

Read the full story at the Mount Desert Islander