Saving Seafood

Scientists turn underwater gardeners to save precious marine plant

February 3, 2022 — Whoever said there’s nothing more boring than watching grass grow wasn’t thinking about seagrass. Often confused with seaweeds and rarely receiving the attention they deserve, there’s nothing boring about seagrasses. In fact, they are one of the most productive ecosystems in the world.

Next time you are swimming and enjoying the sea’s cool embrace look down and try to spot the slender blades of seagrass, a remarkable marine plant that plays a vital role in the coastal environment but is now under threat.

Forming dense underwater meadows, seagrasses are vital to maintain fisheries, absorb carbon and protect coastlines from erosion—but their future is threatened by , pollution and other impacts of human activities, scientists say.

The plants grow in shallow coastal waters in all regions except the Antarctic. They act as nurseries or feeding grounds for hundreds of species of seafood, including sea bream, octopus, cuttlefish and Alaska pollock—one of the most fished species in the world.

Read the full story at Phys.org

The simple food that fights climate change

December 3, 2020 — Simmering in pots around the world is a food that could spark a revolution. Most of us have probably eaten it at some point, but it’s an overlooked part of our diet. This natural source of protein is laden with essential nutrients that could fulfil the dietary needs of nearly one billion people in the most vulnerable populations on the planet. It could be a viable alternative to intensively-farmed meats such as beef. And it comes with smorgasbord of environmental and sociological gains.

The animals that are the source of this food require no feeding, need no antibiotics or agrochemicals to farm. And they actively sequester carbon. They can even protect fragile ecosystems by cleaning the water they live in. Welcome to the remarkable and unglamorous world of the bivalve.

This biological corner of our oceanic ecology is not as attention-grabbing as fish or mesmerising as a deep-sea octopus. Instead it includes the evolutionarily simpler family of shell-dwelling creatures consisting of mussels, clams, oysters and scallops. These hinge shelled molluscs have quietly embraced the lower reaches of the food chain as filter feeders, sustaining themselves on microscopic organic matter present in the waters of their immediate environment.

Their lowly status, however, perhaps means their potential has been largely overlooked. But as the world attempts to find ways of feeding a growing population with less environmental impact, many experts believe we may need to make these shellfish a larger part of our diet.

“Bivalves have the remarkable potential to provide people with food that is not only environmentally sustainable but also nutrient dense,” says David Willer, a zoologist at the University of Cambridge in the UK.

Read the full story at BBC

Octopus Farms Could Become a Reality. Scientists Warn This Isn’t a Good Idea

October 8, 2020 — Some researchers have wanted to commercially farm octopus for decades. From trying to raise hatchlings themselves to storing the wild invertebrates in submerged cages, scientists have tried a range of techniques to cultivate watery fields with on-demand access to the elusive creatures.

The closest researchers have gotten is catching wild octopus for a few months of captive rearing before harvest. Today, there are still no functional octopus farms raising the sea creatures from hatchlings in operation — and that’s how some researchers argue things should stay.

In 2019, a handful of scientists started to raise questions about the ethical and ecological issues that might come from farming these remarkably intelligent animals. Speaking up about these concerns before octopus farming becomes a reality was part of the point, says Jennifer Jacquet, an interdisciplinary scientist at New York University. “Our goal was to create that dialogue before [octopus farming] becomes embedded in our society,” she says.

Read the full story at Discover Magazine

Boom in taste for octopus squeezes market

August 14, 2018 — Whether it’s spiced in the Spanish style or sliced as Japanese sashimi, octopus as a dish is becoming a victim of its own popularity.

Prices for the tentacled mollusc have about doubled in the past two years due to a global boom in appetite for these classic dishes. And supplies have tightened, with fisheries not yet able to farm octopus and relying on ocean currents to yield a good harvest.

This year has been hard, with lower catches in major producing countries like Morocco and Spain.

“The price will rise even more,” says Carmen Torres Lorenzo, who has been selling fish for three decades in the market of Bueu in Spain’s northwestern region of Galicia, famed for its octopus dish. “I wish a lot of octopus would appear … and the price will come down, but that won’t happen.”

The price of a regular size, locally caught octopus has risen from about 7 euros to 14 euros per kilogram (from $8 to $16 for 2.2 pounds) in the last two years. The price is typically somewhat higher in other countries, like the U.S., that do not specialize in its fishing.

The Food and Agriculture Organization says prices are expected to continue to grow as demand has risen in all major markets, including Japan, the United States, China and Europe. Meanwhile, catches have been limited, even in the biggest producing countries, Morocco, Mauritania and Mexico.

Some scientists in Japan and Spain are working on techniques to farm octopus, but they are not ready yet for commercial purposes. Octopus eggs are laid on the ocean floor, where they are fertilized and transported by currents, a condition that is hard to reproduce in a controlled environment.

“There is a lot of demand for this product, and what we can offer is little, so the price skyrockets,” said says Jose Manuel Rosas, president of Bueu’s fishermen guild.

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

After decades of facing off against each other, fishermen and conservationists team up.

April 19, 2018 — History was made April 9 when the Pacific Fishery Management Council, a 14-member body that regulates fisheries on the entire U.S. West Coast, voted unanimously to protect more than 136,000 square miles of seafloor habitat that includes corals, sponges, rocky reefs and undersea canyons from bottom trawl fishing.

Those fragile, slow-growing habitats are important to species like rockfish, sablefish and octopus, and when they become damaged by bottom trawl fishing gear, whether by being toppled or crushed, the habitat can take centuries to recover, if ever.

In that same vote, the council also reopened 3,000 square miles of historical fishing grounds that were closed to allow depleted rockfish stocks to recover.

Read the full story at the Monterey County Weekly 

 

Figuring Out When and Why Squids Lost Their Shells

March 7, 2017 — Shaped like a torpedo and about as swift, squids are jet-propelled underwater predators. Together with their nimble brethren, the octopus and cuttlefish, they make for an agile invertebrate armada.

But that was not always the case. Hundreds of millions of years ago, the ancestors of the tentacled trio were slow, heavily armored creatures, like the coil-shelled ammonites and the cone-shelled belemnites.

Alastair Tanner, a doctoral student at University of Bristol in England, wanted to better understand why those cephalopods lost their shells. But though both ammonites and the belemnites have left behind rich fossil records, their shell-less descendants have not.

So Mr. Tanner conducted a genetic analysis of 26 present day cephalopods, including the vampire squid, the golden cuttlefish and the southern blue-ringed octopus.

Read the full story at the New York Times

Squid Are Thriving While Fish Decline

May 24, 2016 — The squids are all right — as are their cephalopod cousins the cuttlefish and octopus.

In the same waters where fish have faced serious declines, the tentacled trio is thriving, according to a study published Monday.

“Cephalopods have increased in the world’s oceans over the last six decades,” Zoë Doubleday, a marine ecologist from the University of Adelaide in Australia, and lead author of the study, said in an email. “Our results suggest that something is going on in the marine environment on a large scale, which is advantageous to cephalopods.”

Read the full story at the New York Times

Adorable ‘ghost-like’ octopus spotted on sea floor near Hawaii

March 5, 2016 — For a team of federal researchers looking for geologic data on the ocean floor, the pale, ghostly appearance of a unique octopus species inspired diverse reactions.

“That animal is not in the … guide,” said a researcher during the live-feed video from the NOAA Office of Ocean Exploration and Research. “In the immortal words of Taylor Swift, I have never – like ever – seen that one.”

They found the well-armed sea creature, believed to be a new species of octopus, sitting on flat rock 4,000 meters (13,123 feet) below sea level near Hawaii, Michael Vecchione, a National Oceanic and Atmospheric Administration (NOAA) zoologist, wrote in a statement.

“This animal was particularly unusual because it lacked the pigment cells, called chromatophores, typical of most cephalopods, and it did not seem very muscular,” Mr. Vecchione wrote. “This resulted in a ghostlike appearance, leading to a comment on social media that it should be called Casper, like the friendly cartoon ghost.”

Vecchione saw what he called a “remarkable little octopod” while monitoring the video feed from the remotely operated vehicle Deep Discover, which launched from the NOAA’s only federally funded vehicle for deep-sea research, the ship Okeanos Explorer, Christine Dell’Amore reported for National Geographic. 

Read the full story at The Christian Science Monitor