Pacific Bluefin Tuna's Population Has Collapsed

Pacific Prey Wikimedia Commons 

Pacific Bluefin Tuna Population Has Dropped By 96 Percent -- Popsci.com 

The dark side of sushi's surge in popularity. For the Pacific bluefin tuna, sitting at the popular kids' table sure isn't paying off. The stock of the fish is at historically low levels and is being dangerously overfished, a new report shows. Fisheries scientists from the International Scientific

Committee to Study the Tuna and Tuna-Like Species of the North Pacific Ocean estimate that the Pacific bluefin population has declined from its unfished level by more than 96 percent. The report warns that stock levels likely won't improve by extending the current fishing levels. All the world's scrombrids -- a family that includes tunas and mackerels -- are on the endangered list.

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My Comment: The next step will be a ban on Pacific Bluefin Tuna fishing.

Japan Bluefin Tuna Sells For $1.76 Million

Japan Bluefin Tuna Sells For Record $1.76 Million -- NBC/AP 

A bluefin tuna sold for a record $1.76 million at a Tokyo auction Saturday, nearly three times the previous high set last year — even as environmentalists warn that stocks of the majestic, speedy fish are being depleted worldwide amid strong demand for sushi.

In the year's first auction at Tokyo's sprawling Tsukiji fish market, the 222-kilogram (489-pound) tuna caught off northeastern Japan sold for 155.4 million yen, said Ryoji Yagi, a market official.

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My Comment: Now that is a big (and expensive) fish.

Atlantic Cod Recovering

Photo: Cod and similar species on the Scotian Shelf have been eight to 18 per cent more massive for their age between 2006 and 2010 compared with 1992 to 2005. (Associated Press)

East Coast Cod Found To Be Recovering -- CBC

New evidence shows that Atlantic cod off Nova Scotia are recovering from their dramatic collapse two decades ago — and that the ecosystem is recovering with them.

That suggests major changes to marine ecosystems can be reversed with time, says a Canadian study published Wednesday in the scientific journal Nature.

It also "bodes well" for other cod populations further north along the East Coast that have yet to recover, says the study, led by researcher Kenneth Frank at the Bedford Institute of Oceanography in Dartmouth, N.S.

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Tuna Need Urgent Protection, Study Concludes

A school of bluefin tuna (Thunnus maccoyii).

CREDIT: NOAA Fisheries Service

From Live Science:

Five of the eight species of tuna now qualify as threatened or near-threatened, according to the world's main authority on the conservation status of animal species. The tuna face a bleak future if more isn't done to safeguard them from overfishing, researchers warn.

Published today (July 7), the draft assessment of the International Union for Conservation of Nature's Red List of Threatened Species shows most tuna species are declining.

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The Bitter Battle Over Bluefin Tuna

Glossy and greedy: Bluefin tuna is one of the world's most highly prized foodstuffs.

From The BBC:

"Welcome to the strange world of globalisation."

That is Roberto Mielgo's response to the fact that it is commercially viable to catch and keep live tuna in off-shore pens - or ranches - in the Spanish Mediterranean and feed them vast amounts of expensive caught fish (around 10kg of feed fish serve to make the tuna put on 1kg of body weight).

And to cull them by hand using divers, ship them to shore, package them in a purpose-built factory and fly them whole - on the same day - to market on the other side of the world.

Roberto Mielgo calls himself an independent fisheries consultant.

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Acid Oceans Leave Fish At More Risk From Predators

From The BBC:

Ocean acidification could cause fish to become "fatally attracted" to their predators, according to scientists.

A team studying the effects of acidification - caused by dissolved CO2 - on ocean reefs found that it leaves fish unable to "smell danger".

Young clownfish that were reared in the acidified water became attracted to rather than repelled by the chemical signals released by predatory fish.

The findings were published in the journal Ecology Letters.

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Fishing Quota Will Lead To Extinction Of Bluefin Tuna, Warn Conservationists

From Times Online:

Conservationists have accused the organisation charged with ensuring the survival of the bluefin tuna of pushing the fish to extinction.

Members of the International Convention for the Conservation of Atlantic Tuna (ICCAT) voted to allow 13,500 tonnes of tuna to be caught next year, which scientists say will lead to the disappearance of the fish from the Mediterranean within two years.

The European Union was blamed for having blocked plans at the Brazil conference for a moratorium on catching the fish in the Mediterranean.

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EPA Study Says Mercury-Tainted Fish Found In 49% Of U.S. Lakes And Reservoirs

From The Bloomberg:

Fish with potentially harmful levels of mercury were found in 49 percent of U.S. lakes and reservoirs studied, the Environmental Protection Agency said.

Lakes in almost half of the states had fish contaminated by toxic chemicals such as mercury, polychlorinated biphenyls or pesticides, the EPA said in a statement Tuesday on a study conducted from 2000 to 2003.

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'Last Chance' For Tuna Authority

Tsukiji market in Tokyo is the final destination for a large proportion of bluefin

From The BBC:

The annual meeting of the body charged with conserving Atlantic tuna opens on Monday to warnings that this is its "last chance" to manage things well.

The International Commission for the Conservation of Atlantic Tunas (Iccat) is criticised for setting high quotas and not tackling illegal fishing.

Stocks of bluefin tuna are at about 15% of pre-industrial fishing levels.

US Commissioner Rebecca Lent said her country and others feel this is Iccat's last chance to put things right.

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Hunting For Tuna: The Environmental Peril Grows

Tuna are unloaded at a wharf in Port Lincoln, South Australia. The town has the highest number of millionaires per capita in the country. Photo: AAP

From Time Magazine:

Nearly every day at dawn, John Heitz falls a little bit in love. Leaning over a 150-lb. (70 kg) yellowfin tuna, the 55-year-old American, whose business is exporting fish, circles his forefinger around its deep eye socket. "Look how clear these eyes are." He traces the puncture where the fish was hooked, and the markings under its pectoral fin where it struggled on the line. "Sometimes," Heitz says, "I see a good tuna, and it looks better to me than a woman."

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Tuna Ban 'Justified' By Science

The bluefin is highly prized for many dishes, notably sushi

From The BBC:

Banning trade in Atlantic bluefin tuna is justified by the extent of their decline, an analysis by scientists advising fisheries regulators suggests.

The International Commission for the Conservation of Atlantic Tunas' (ICCAT) advisers said stocks are probably less than 15% of their original size.

The analysis has delighted conservation groups, which have warned that over-fishing risks the species' survival.

ICCAT meets to consider the report in 10 days' time.

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Half Of Fish Consumed Globally Is Now Raised On Farms, Study Finds

These are moi, or Pacific threadfin, being sorted for market after harvest from an offshore aquaculture cage in Hawaii. (Credit: NOAA)

From Science Daily:

ScienceDaily (Sep. 8, 2009) — Aquaculture, once a fledgling industry, now accounts for 50 percent of the fish consumed globally, according to a new report by an international team of researchers. And while the industry is more efficient than ever, it is also putting a significant strain on marine resources by consuming large amounts of feed made from wild fish harvested from the sea, the authors conclude. Their findings are published in the Sept. 7 online edition of the Proceedings of the National Academy of Sciences (PNAS).

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Giant Robotic Cages to Roam Seas as Future Fish Farms?

A worker cleans an Aquapod fish cage off Peurto Rico in an undated photo. Another Aquapod has been outfitted with remote-control propellers. Someday such automated cages could herald an entirely new form of fish farming, with robotic cages roaming the seas, mimicking the movements of wild schools. Photograph courtesy Ocean Farm Technologies

From National Geographic:

In the future, giant, autonomous fish farms may whir through the open ocean, mimicking the movements of wild schools or even allowing fish to forage "free range" before capturing them once again. Already scientists have constructed working remote control cages.

Such motorized cages could help produce greener, healthier, and more numerous fish, just when we need them most.

The world's growing population is devouring seafood as quickly as it can be caught and has seriously depleted the world's wild fish stocks, experts warn.

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Mercury Found In All Fish Caught In U.S.-Tested Streams

Two USGS scientists analyze fish for mercury in the St. Marys River in northern Florida.
By Mark Brigham, AP

From USA Today:

Sports fishermen take heed: A government test of fish pulled from nearly 300 streams in the USA found every one of them contaminated with some level of mercury.

The U.S. Geological Survey's research marks its most comprehensive examination of mercury contamination in stream fish. The study found that 27% of the fish had mercury levels high enough to exceed what the Environmental Protection Agency considers safe for the average fish eater, those who eat fish twice a week.

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Can the World's Fisheries Survive Our Appetites?

Photo: Scottish fisherman Mike Nichol on board the trawler Carina in the North Atlantic helps haul in the catch. Chris Furlong / Getty

From Time Magazine:

Boris Worm, a marine biologist at Dalhousie University in Canada, made a startling prediction in the pages of Science in 2006: if overfishing continued at then-current rates, he said, the world would essentially run out of seafood by 2048. Worm's bold analysis whipped up controversy in the usually pacific world of marine science — one colleague, Ray Hilborn of the University of Washington, called the Science study "mindbogglingly stupid." But Worm held fast to his predictions: that the oceans had limits, and that marine species were declining so fast that they would eventually disappear.

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