Saving Seafood

Can farmed fish feed the world sustainably?

September 14, 2016 — The world’s population is expected to soar by 2.5 billion people by 2050, bringing a host of global challenges – including how to feed so many hungry mouths.

If projections hold, the global demand for animal protein will double over the next four decades, rising along with pressure to find ecologically sustainable food production practices.

Could farmed fish save the day? Just maybe, says UC Santa Barbara’s Steve Gaines. He and his team looked at wild-caught fish, farmed fish and land-based farming to assess the most viable long-term options.

The surprise: Fish farming floated above the rest for ecologic and economic reasons.

But there’s one big catch: Aquaculture has gotten a bad rap with American consumers.

“I meet people all the time who say, ‘I will only eat wild fish because aquaculture is bad,’” said Gaines, dean of the Bren School of Environmental Science & Management at UC Santa Barbara.

Gaines has been working to change minds about aquaculture, speaking at conferences around the country like this week’s Monterey Bay Aquarium Sustainable Foods Institute.

While some forms of aquaculture can harm the environment, others have a much lower impact, especially when compared to raising livestock – and in some cases even compare favorably to an entirely vegetarian diet, he said.

Read the full story from the University of California

Pollutants in Fish Could Disrupt Your Defenses to Toxins

April 18, 2016 — Human defense mechanisms could be disrupted by the presence of a class of organic pollutants in fish and other food, according to new research.

The study, published in the journal Science Advances, appears to be the first to identify the mechanism by which chemicals like flame retardants—present in many household furniture items, like sofas and mattresses—and the pesticide DDT block a key protein from removing toxins from the body. P-glycoprotein, the protein in question, defends against toxins that entered the body by transporting them for removal. The new research shows that persistent organic pollutants, known as POPs, latch onto proteins and prevent them from functioning.

“These environmental chemicals form intimate interactions,” says study author Amro Hamdoun of the Scripps Institution of Oceanography at the University of California, San Diego. “But instead of being expelled, these proteins interfere with the ability of p-glycoprotein from doing its job.”

Awareness about the risks of POPs is nothing new. Public health campaigners have sought to remove POPs from the environment for decades, and a 2001 treaty even committed countries to take measures to reduce human exposure to the pollutants.

Read the full story at Time

Here’s How the Number of Fish in the Ocean Could More Than Double by 2050

March 31, 2016 — Fish populations around the world have been decimated by overfishing — but new research suggests that this could soon change if the world got its act together.

Fishermen around the world could haul around 16 million more metric tons of fish than they do today and generate $53 billion more in profits while more than doubling the amount of fish left in the oceans by 2050 if they adopted sustainable fishing practices, according to a report published in the Proceedings of the National Academy of Sciences.

Those practices would involve a so-called “catch share” model of fisheries management. In catch share systems, regulators figure out the maximum number of fish that can be hauled from the sea without hurting future fish populations. The regulators then divvy up that amount of fish into shares that are distributed to individual fishermen. Each fisherman has a set amount of fish they are can catch in the year.

“If you can reform fisheries and eliminate their competitive nature, there’s enormous room for profits, catch, and abundance,” said Ray Hilborn, a professor of marine biology and fisheries science at the University of Washington who co-authored the study with researchers at the University of California, Santa Barbara and the Environmental Defense Fund.

Read the full story at VICE News

Cleaner fuels for fishing boats could backfire on the climate

February 5, 2016 — Fish is better than pork and beef—not just for your body, but for the planet. That’s long been the thinking, anyway. But a new study has uncovered a hidden climate impact of the fishing industry—one that, ironically, will get worse as boats switch to cleaner fuels. In some cases, the effect could make fishing for tuna as hard on the climate as raising pork, and trawling for shrimp about half as bad as raising beef.

Hogs and cattle get a bad rap because they—and their manure—emit a lot of methane, a powerful greenhouse gas. But the fishing industry also contributes to climate change: mostly from the carbon dioxide (CO2) from burned diesel fuel that persists in the atmosphere for hundreds of years. The boats produce other short-lived pollutants, such as sulfur oxides and black carbon, which have cooling and warming effects, respectively. But they have typically been neglected as unimportant in the grand scheme of things.

The new study may change that. Elliott Campbell and Brandi McKuin, environmental engineers at the University of California (UC), Merced, estimated fishing industry emissions by combining fisheries catch records with the amount of fuel typically needed to catch various species. Given the total burned fuel, they estimated the amounts of the pollutants, using information about engine types and fuel types. Black carbon, a form of soot that arises from incomplete combustion, has been underestimated by an order of magnitude in previous studies, the team reports in the Journal of Geophysical Research: Atmospheres.

Read the full story from Science Magazine

Fish Stocks Are Declining Worldwide, And Climate Change Is On The Hook

December 14, 2015 — For anyone paying attention, it’s no secret there’s a lot of weird stuff going on in the oceans right now. We’ve got a monster El Nino looming in the Pacific. Ocean acidification is prompting hand wringing among oyster lovers. Migrating fish populations have caused tensions between countries over fishing rights. And fishermen say they’re seeing unusual patterns in fish stocks they haven’t seen before.

Researchers now have more grim news to add to the mix. An analysis published Monday in the Proceedings of the National Academy of Sciences finds that the ability of fish populations to reproduce and replenish themselves is declining across the globe.

“This, as far as we know, is the first global-scale study that documents the actual productivity of fish stocks is in decline,” says lead author Gregory L. Britten, a doctoral student at the University of California, Irvine.

Britten and some fellow researchers looked at data from a global database of 262 commercial fish stocks in dozens of large marine ecosystems across the globe. They say they’ve identified a pattern of decline in juvenile fish (young fish that have not yet reached reproductive age) that is closely tied to a decline in the amount of phytoplankton, or microalgae, in the water.

Read the full story at NPR