Saving Seafood

Measuring Atlantic Bluefin Tuna with a Drone

June 10, 2020 — This novel use of drones is a promising way to remotely monitor these hard-to-see fish

Researchers have used an unmanned aerial system (or drone) to gather data on schooling juvenile Atlantic bluefin tuna in the Gulf of Maine.

This pilot study tested whether a drone could keep up with the tuna while also taking photographs that captured physical details of this fast-moving fish. The drone was equipped with a high-resolution digital still image camera. Results show that drones can capture images of both individual fish and schools. They may be a useful tool for remotely monitoring behavior and body conditions of the elusive fish.

Individual fish lengths and widths, and the distance between fish near the sea surface, were measured to less than a centimeter of precision. We used an APH-22, a battery-powered, six-rotor drone. The pilot study was conducted in the Atlantic bluefin tuna’s foraging grounds northeast of Cape Cod in the southern Gulf of Maine.

“Multi-rotor unmanned aerial systems won’t replace shipboard surveys or the reliance on manned aircraft to cover a large area,” said Mike Jech, an acoustics researcher at the Northeast Fisheries Science Center in Woods Hole, Massachusetts and lead author of the study. “They have a limited flight range due to battery power and can only collect data in bursts. Despite some limitations, they will be invaluable for collecting remote high-resolution images that can provide data at the accuracy and precision needed by managers for growth and ecosystem models of Atlantic bluefin tuna.”

Read the full story at Environment Coastal & Offshore

MSC faces NGO criticism in Atlantic bluefin hearing, new report

June 2, 2020 — In a hearing taking place 1 and 2 June, the World Wildlife Fund (WWF) is questioning the merits of the Marine Stewardship Council’s (MSC) certification of the first Atlantic bluefin tuna fishery, citing a “questionable evaluation process that has repeatedly ignored the fragile status of the stock.”

According to WWF, MSC’s current certification of the bluefin tuna fishery has dismissed “the best available science and therefore produced a evaluation of the fishery that does not reflect the reality at sea.”

Read the full story at Seafood Source

84% of Global Tuna Catch Comes from Stocks at Healthy Levels, While 15% Require Stronger Management

April 2, 2020 — The following was released by the International Seafood Sustainability Foundation:

Of the total commercial tuna catch worldwide, 84% came from stocks at “healthy” levels of abundance, according to the March 2020 International Seafood Sustainability Foundation (ISSF) Status of the Stocks report. In addition, 15% of the total tuna catch was from overfished stocks, and 1% was from stocks at an intermediate level of abundance. The previous version of this report was released by ISSF in October 2019.

Several tuna stocks worldwide are considered overfished and/or subject to overfishing:

  • The Atlantic Ocean bigeye, Eastern Pacific yellowfin, Indian Ocean yellowfin and Pacific bluefin tuna stocks are currently overfished and subject to overfishing.
  • Overfishing is occurring as well on three other stocks: Eastern Pacific bigeye, Indian Ocean bigeye and Indian Ocean albacore.
  • All skipjack and most albacore stocks are healthy.

Ratings for the following species have changed since last reported in October: 

  • The Spawning Biomass (SSB) ratio for Atlantic Ocean yellowfin has improved from yellow to green.
  • The fishing mortality rate ratio for Indian Ocean bigeye has downgraded from green to orange.
  • The fishing mortality ratio for Indian Ocean albacore has downgraded from green to orange.

ISSF publishes its signature Status of the Stocks report twice each year using the most current scientific data on 23 major commercial tuna stocks.

Key Statistics in the Report

  • ​​Abundance or “spawning biomass” levels: Globally, 65% of the 23 stocks are at healthy levels of abundance, 17.5% are overfished and 17.5% are at an intermediate level.
  • Fishing mortality levels: 70% of the 23 stocks are experiencing a well-managed fishing mortality rate, and 30% are experiencing overfishing.
  • Total catch: In 2018, the catch of major commercial tuna stocks was 5.1 million tonnes. 58% was skipjack tuna, followed by yellowfin (29%), bigeye (8%) and albacore (4%). Bluefin tunas accounted for 1% of the global catch.
  • Largest tuna catches by stock: The five largest catches in tonnes, unchanged since the previous report, are Western Pacific Ocean skipjack, Western Pacific Ocean yellowfin, Indian Ocean skipjack, Indian Ocean yellowfin and Eastern Pacific Ocean skipjack.
  • Tuna production by fishing gear: 66% of the catch is made by purse seining, followed by longline (10%), pole-and-line (8%), gillnets (4%) and miscellaneous gears (12%).  These percentages changed minimally since the previous report.

The Status of the Stocks report is reviewed by the ISSF Scientific Advisory Committee, which provides advice on its content. The report does not advocate any particular seafood purchase decisions.

New Requirements Protect Bluefin Tuna, Expand Opportunities in Other Fisheries

March 31, 2020 — The following was released by NOAA Fisheries:

Today, NOAA Fisheries announced measures that provide more fishing opportunities for vessels targeting Atlantic swordfish and some tuna species. We will continue under these measures to protect bluefin tuna from overfishing.

The changes give fishermen using pelagic longlines access to new fishing areas originally closed to reduce the number of bluefin caught unintentionally. Under the new rules, longline fishermen in the Gulf of Mexico are also required to use weak hooks only when bluefin tuna are spawning. This means they are only required to use them January through June rather than year-round.

Regardless of where or when they fish, longline fishermen are still not allowed to target bluefin tuna. They can keep some caught unintentionally, but they have to stay within their individual allocation of the U.S. bluefin quota. This allows them to fish for economically valuable species like swordfish and other tunas while protecting bluefin.

The measures are in part a response to the success of the Individual Bluefin Quota (IBQ) Program in reducing bluefin bycatch. We also designed the measures to help reverse a trend of underharvesting the U.S. swordfish quota.

“The success of the IBQ Program has allowed us to simplify and streamline Atlantic HMS management,” said Randy Blankinship, who leads the group responsible for managing Atlantic bluefin in the United States. “With this rule, we are optimizing fishing opportunities for pelagic longline fishermen while continuing to manage and conserve bluefin tuna through the IBQ program and other management measures.”

Read the full release here

Why marine protected areas are often not where they should be

March 26, 2020 — There’s no denying the grandeur and allure of a nature reserve or marine protected area. The concept is easy to understand: limit human activity there and marine ecosystems will thrive.

But while the number of marine protected areas is increasing, so too is the number of threatened , and the health of  is in decline.

Why? Our research shows it’s because marine protected areas are often placed where there’s already low , rather than in places with high biodiversity that need it most.

Not where they should be

Many parts of the world’s protected areas, in both terrestrial and , are placed in locations with no form of manageable human activity or development occurring, such as fishing or infrastructure. These places are often remote, such as in the centres of oceans.

And where marine protected areas have been increasing, they’re placed where pressures cannot be managed, such as areas where there is increased ocean acidification or dispersed pollution.

Read the full story at PHYS.org

‘Tuna King’ buys 608-pound fish for $1.8 million at Sunday auction in Japan

January 7, 2020 — One fish, two fish, red fish… million-dollar tuna fish.

Japanese businessman Kiyoshi Kimura, who has dubbed himself the “Tuna King,” purchased a 608-pound fish for $1.8 million at a Sunday auction.

The blue fin fetched the second-highest price in history at auction Sunday, Japanese Broadcasting Corporation NHK reported.

Caught in Aomori, a political region of Japan, the giant fish sold for 193 million yen — equivalent to nearly $1.8 million.

“Yes, this is expensive, isn’t it? I want our customers to eat very tasty ones this year, too,” Kimura said after the auction, as reported by Agence France-Presse.

Read the full story at the New York Daily News

Sustainable Management Means We Can Have Our Tuna and Eat It Too

December 3, 2019 — The following was released by NOAA Fisheries:

Bluefin tuna is often used as a poster species for the impacts of overfishing. But we have good news for seafood lovers eyeing bluefin sashimi at their local sushi restaurant: U.S.-caught Atlantic bluefin tuna is a sustainable food choice.

Bluefin tuna are some of the most valuable fish in the Atlantic. In 2017 alone, U.S. commercial fishermen generated an estimated $9.6 million in revenue from harvesting bluefin. That year, fishermen earned an estimated $6.45 for every pound of bluefin they harvested–more than any other Atlantic tuna.

That value may sound low to those who’ve read about bluefin selling for millions or watched popular fishing shows touting higher prices for this species. As with any product, the value of bluefin will fluctuate with demand, quantity, and quality. Commercial marketing and traditions like celebrating the first bluefin purchased each year can also drive up prices in limited situations. But the million-dollar price tags occasionally reported are far from the norm. In fact, the median value a bluefin tuna in 2018 was just over $2,000.

Atlantic bluefin tuna are also a coveted recreational species that support millions of dollars in economic value each year. A 2015 study conducted by the Virginia Institute of Marine Sciences analyzed recreational anglers’ willingness to pay for bluefin tuna trips. The results showed that the private boat bluefin tuna fishery had an estimated value of $14 million that year.

Read the full release here

Report: ICCAT bluefin rules leave loopholes for IUU

November 15, 2019 — A new report, recently published on ResearchGate, has found that the current catch documentation method for Atlantic bluefin tuna used by the International Commission for the Conservation of Atlantic Tunas leaves large loopholes that can be exploited by fishers catching more than what is allowed, allowing them to have illicit catch enter E.U. markets.

The report, funded by the WWF, is focused exclusively on the eastern bluefin tuna stock. It comes in the wake of the 2018 bluefin tuna trade scandal, which found an illicit trade network selling large amounts of illegally harvested bluefin tuna in Europe. A complex, multi-organization investigation that included the Spanish Guardia Civil and EUROPOL – dubbed Operation Tarantelo – discovered that the illicit trade of illegal bluefin tuna catch had been occurring for years. The trade involved most of the countries in the northern Mediterranean, with illegal bluefin tuna coming from Maltese farms and Italian fishing boats. One of the largest Spanish tuna farming operators, Ricardo Fuentes y Hijos, was found to be the mastermind behind the trade on the Spanish side, and used a number of companies to issue false ICCAT bluefin catch documentation. The volume of the resulting illicit trade was estimated to be around 2,500 metric tons a year, which would have represented 18.6 percent of the total quota for the E.U. in 2017.

Read the full story at Seafood Source

As bluefin recover, a new fight about how to fish for them

September 30, 2019 — A federal plan that could loosen the rules about fishing for one of the most debated species in the ocean has attracted the attention of fishermen and environmentalists, some of whom fear years of conservation work could be undone.

Preservation of the Atlantic bluefin tuna has long been a subject of international debate, and sometimes discord. The giant sushi fish, which occasionally sell for more than $1 million and often weigh several hundred pounds, are at a fraction of historical population levels but have shown positive signs in recent years.

The federal government is considering some changes to the way the fish are managed. The National Oceanic and Atmospheric Administration has said some of the changes would give fishermen who use longlines, a method of fishing used to catch large fish, more flexibility by increasing their amount of open fishing area, including in the Gulf of Mexico.

The Gulf of Mexico is a critical spawning area for bluefin, and parts of it are closed down to longliners in the spring to protect the fish. Reopening it to fishing could jeopardize the bluefin stock in U.S. waters and beyond, said Shana Miller, senior officer for international fisheries conservation with the Ocean Foundation.

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

As bluefin recover, a new fight about how to fish for them

September 25, 2019 — A federal plan that could loosen the rules about fishing for one of the most debated species in the ocean has attracted the attention of fishermen and environmentalists, some of whom fear years of conservation work could be undone.

Preservation of the Atlantic bluefin tuna has long been a subject of international debate, and sometimes discord. The giant sushi fish, which occasionally sell for more than $1 million and often weigh several hundred pounds, are at a fraction of historical population levels but have shown positive signs in recent years.

The federal government is considering some changes to the way the fish are managed. The National Oceanic and Atmospheric Administration has said some of the changes would give fishermen who use longlines, a method of fishing used to catch large fish, more flexibility by increasing their amount of open fishing area, including in the Gulf of Mexico.

The Gulf of Mexico is a critical spawning area for bluefin, and parts of it are closed down to longliners in the spring to protect the fish. Reopening it to fishing could jeopardize the bluefin stock in U.S. waters and beyond, said Shana Miller, senior officer for international fisheries conservation with the Ocean Foundation.

Read the full story from the Associated Press at the Houston Chronicle