December 28, 2023 — The results of a study on bluefin tuna genetics, intended to support better conservation and help aid in the creation of effective management plans, recently appeared in the scientific journal Molecular Ecology.
AZTI Technological Centre, an organization that specializes in marine and food research, led the study and said the results will support sustainable management plans that better anticipate when changes in abundance or distribution occur.
January 13, 2023 — The top bluefin tuna sold during the first auction of the year at Tokyo’s Central Wholesale Market in Toyosu reached JPY 36,040,000 (USD 274,120, EUR 256,785), carrying on a tradition started at the market’s former location in Tsukiji and signaling some recovery from the pandemic.
The high price has nothing to do with the actual value of tuna, nor with its relative scarcity. As in years past, it’s a PR stunt and a reasonably inexpensive way for the purchaser to get worldwide name recognition.
March 4, 2022 — The Slope Sea off the Northeast United States is a major spawning ground for Atlantic bluefin tuna (Thunnus thynnus), a new paper affirms. This finding likely has important implications for population dynamics and the survival of this fish, according to the paper, “Support for the Slope Sea as a major spawning ground for Atlantic bluefin tuna: evidence from larval abundance, growth rates, and particle-tracking simulations,” published in the Canadian Journal of Fisheries and Aquatic Sciences.
“Overall, our results provide important supporting evidence that the Slope Sea is a major spawning ground that is likely to be important for population dynamics,” the paper states. Spawning in the Slope Sea “may offer the species additional resilience in the face of both harvesting and climate change,” the paper adds.
The paper presents larval evidence supporting the recognition of the Slope Sea as a major spawning ground, including that larvae collected in the Slope Sea grew at the same rate as larvae collected in the Gulf of Mexico, indicating that this region is good larval habitat.
“In comparison to everything else we know about this species, the Slope Sea is a perfectly good place to be born as a larva,” said lead author Christina Hernández, who was a doctoral student in the Massachusetts Institute of Technology (MIT) – Woods Hole Oceanographic Institution (WHOI) Joint Program in Oceanography/Applied Ocean Science and Engineering at the time of the study.
Read the full story at the Woods Hole Oceanographic Institution
November 24, 2021 — The International Commission for the Conservation of Atlantic Tunas (ICCAT), approved increases to the total allowable catch (TAC) of bluefin and bigeye at its annual meeting, which ended Tuesday, 23 November.
ICCAT is the regional fisheries management organization (RFMO) responsible for conservation of tunas and tuna-like species in the Atlantic Ocean and adjacent seas, including the Mediterranean. ICCAT fishery managers agreed to raise the Atlantic bluefin TAC for the western side of the Atlantic by 376 MT, or 16 percent, from 2,350 MT to 2,726 MT, as the 2021 western Atlantic bluefin tuna stock assessment estimates that the total biomass has increased by 9 percent between 2017 and 2020. This was a reversal from the 2020 meeting, when discussions revolved around reducing the total allowable catch. TAC for the eastern Atlantic is unchanged. The total quota for Atlantic bluefin tuna for 2022 will be 3,483 MT.
November 10, 2021 – A new study of western Atlantic bluefin tuna population data is expected to improve management practices and a valuable marketplace for fishermen from Maine to Texas.
Thousands of commercial and recreational fishermen capture the tuna, one of the strongest and fastest predators in the open ocean, off the East Coast each year.
The tuna is “among the most sought-after commercial fish in the world’s oceans,” University of Maine assistant professor Walt Golet said in a news release.
The National Oceanic and Atmospheric Administration awarded Golet, a research assistant professor with the School of Marine Sciences, more than $276,000 to lead a team of researchers who will collect and analyze updated the animal’s population data. The new data will help reduce uncertainties in assessment models that estimate the amount of fish in the fishery, which can help guide management practices and prevent overfishing, he said.
Golet was also awarded almost $300,000 from NOAA for a project to help bolster the industry. The research includes developing best practices for handling, particularly cleaning and chilling the fish, and outreach to improve consumer perceptions and markets.
October 27, 2021 — The Inter-American Tropical Tuna Commission (IATTC) has approved a higher catch limit for Pacific bluefin tuna.
Based on IATTC Scientific Committee projections that indicated a 100 percent chance of reaching an initial stock rebuilding target by 2024, the IATTC approved a 15 percent increase in the catch limit for adults (over 30 kilograms) and no change for juveniles. The decision was made at IATTC’s full commission meeting, which ran from 13 to 22 October.
Read the full story at SeafoodSource
October 21, 2021 — Regional fishery management organizations (RFMOs) that regulate Pacific bluefin tuna have moved closer to adopting a catch increase, based on an improved outlook for meeting stock recovery goals.
During its 5-7 October electronic meeting, the Northern Committee (NC) of the Western and Central Pacific Fisheries Commission (WCPFC) approved, by consensus, the recommendation of the sixth Joint IATTC and WCPFC-NC Working Group Meeting on the Management of Pacific Bluefin Tuna (JWG06).
Read the full story at SeafoodSource
September 8, 2021 — The regional fishery management organization that sets tuna harvest-limits in the Eastern Pacific Ocean once again deferred a decision on the Pacific bluefin harvest after failing to reach consensus on the details of a proposed increase.
At the 23 to 27 August meeting of the full commission of the Inter-American Tropical Tuna Commission (IATTC) a proposal by the United States reflecting the recommendations of the online 27 to 29 July Sixth Joint Inter-American Tropical Tuna Commission Northern Committee Working Group Meeting was taken up, but the parties didn’t reach a consensus agreement on specific details in the new language. As a result, the IATTC gave itself more time to negotiate the details before another full commission meeting in October 2021.
Read the full story at SeafoodSource
September 7, 2021 — The populations of four of the most commercially fished tuna species are showing signs of recovery but rising sea levels mean the Komodo dragon is now classed as endangered on the latest Red List of species at risk of extinction.
The International Union for Conservation of Nature (IUCN) that compiles the list is also stepping up monitoring of marine species such as coral and deep sea snails to see how they are impacted by climate change and threats such as deep sea mining.
“Ocean species tend to be neglected as they are under the water and people don’t really pay attention to what is happening to them,” Craig Hilton-Taylor, head of the IUCN Red List unit, told Reuters.
But as catch quotas and efforts to target illegal fishing showed signs of working, the outlook for tuna appears to be improving.
Atlantic bluefin tuna, a huge warm-blooded migratory predator that is prized for sushi and can sell for thousands of dollars, jumped three categories from “endangered” to “least concern” on the list, although some regional stocks remained severely depleted.
Read the full story at Reuters
July 15, 2021 — Last year, fish consumption reached a global annual average of 37.5 pounds per person. Meanwhile, cod and bluefin-tuna populations have collapsed, and animals ranging from whales to turtles have been added to the Endangered Species Act. Our voracious appetite isn’t the only problem. Fishermen catch a lot of things unintentionally, in what Tim Werner, director of the New England Aquarium’s Marine Conservation Engineering program, calls the “collateral damage” of commercial fishing: bycatch.
Compared with the more intractable problem of overfishing, technological solutions to bycatch abound. Bycatch ensnares coral, sponges, starfish, sharks, whales, turtles and even birds. It is “one of the more immediate threats that marine diversity faces,” Werner says. It has led to the assumed extinction of the Yangtze River dolphin, has nearly wiped out the Gulf of California’s vaquita porpoise (fewer than 200 remain), and threatens the survival of the North American right whale (400 remain) and the short-tailed albatross. A United Nations report estimates bycatch at 7.5 million tons a year, or 5 percent of the total commercial-fishing haul. Because most available data is self-reported, Werner says that the U.N.’s numbers “woefully underestimate” the problem. A more representative statistic, he says, comes from Gulf of Mexico shrimp fisheries, some of which dredge up to five pounds of bycatch for every pound of shrimp.
The good news is that compared with the more intractable problem of overfishing, technological solutions to reduce bycatch abound. Shrimp companies, for example, have begun using “turtle-excluding devices,” metal grates at the front of a trawl net that let the shrimp in and keep the turtles out. Fishermen who use long subsurface “gillnets” have begun to deter porpoises by equipping these nets with battery-powered acoustic “pingers.” In the best cases, pingers have reduced casualties from 25 porpoises per net to one. At Florida Atlantic University, associate professor Stephen Kajiura is trying to protect sharks by affixing rare-earth elements to the lines that fishermen use to catch tuna. The metals react with seawater to create an electromagnetic field that repels sharks (as well as skates and rays).