Saving Seafood

Fisheries Managers Cast Doubt on Sardine Survey Methods

April 13, 2017 — SEAFOOD NEWS — Fishing for Pacific sardines in California has been banned for the third consecutive year.

The Pacific Fishery Management Council voted Monday afternoon in Sacramento to close the fishery through June 30, 2018, because the population limit of 150,000 metric tons wasn’t met.

Researchers estimate that only about 87,000 metric tons of the oil-rich fish are now swimming around off the coast.

The decision blocks commercial fishers in San Pedro, Long Beach and elsewhere across the West Coast from anything other than small numbers of incidental takes. While sardines don’t command the high price of California shellfish, their plentiful numbers and popularity make them one of the state’s most-caught finfish.

But fishery managers say there’s reason to believe sardines are much more plentiful than studies have found.

National Oceanic and Atmospheric Administration’s Southwest Fisheries Science Center Deputy Director Dale Sweetnam said the acoustic-trawl method that researchers use to estimate the number of sardines is flawed.

The count is done from a large NOAA ship that surveys the entire West Coast by sampling schools of fish, and then bounces sound waves off of them to create a diagram that estimates the size.

But the ship is too large to go into harbors or coastal areas where sardines like to congregate.

“There are questions about the acoustic detector being on the bottom of the ship — how much of the schools in the upper water columns are missed by the acoustics,” Sweetnam said. “Also, the large NOAA ship can’t go in shallow waters, but most of the sardine fishery is very close to shore.”

The fisheries service will soon employ a California Department of Fish and Wildlife plane, along with drones, to survey coastal areas for sardines.

“It will take some time because we’re going to have to determine a scientific sampling scheme,” Sweetnam said. “We’re starting this collaborative work with the fishing industry to extend our sampling grid-lines to shore.”

However, environmental activists cheered the decision to close the sardine fishery for a third season.

Oceana, a worldwide conservation advocacy organization, blames the sardine population decline on overfishing.

“Over the last four years we’ve witnessed starved California sea lion pups washing up on beaches and brown pelicans failing to produce chicks because moms are unable to find enough forage fish,” said Oceana campaign manager Ben Enticknap.

“Meanwhile, sardine fishing rates spiked right as the population was crashing. Clearly, the current sardine management plan is not working as intended and steps must be taken to fix it.”

Industry representatives, however, argue that fishers are reliable environmental stewards and that they are just as eager as environmental activists to protect the long-term survival of marine species.

California fishers were able to replace sardine takes with increased numbers of squid in recent years. This year, promising anchovy stocks and other fish may keep the industry solvent.

California Wetfish Producers Association Executive Director Diane Pleschner-Steele said fishermen are frustrated.

“Fishermen are just ready to pull their hair out because there’s so many sardines and we can’t target them,” Pleschner-Steele said. “I’m relieved that the Southwest Fisheries Science Center acknowledges problems with the current stock assessment and has promised to work with the fishermen to develop a cooperative research plan to survey the near-shore area that is now missed. Unfortunately, this does not help us this year.”

This story originally appeared on Seafoodnews.com, a subscription site. It is reprinted with permission.

New and rare whale species identified from carcass found in Pribilofs

July 27, 2016 — A stroll on the beach of a remote Bering Sea island two years ago has produced a scientific breakthrough — the discovery of a previously unidentified species of beaked whale that dwells in the deep waters of the North Pacific Ocean.

The conclusion, described in a study published in the journal Marine Mammal Science of the California-based Society for Marine Mammalogy, stems from the 2014 discovery of a beached whale carcass by a local monitoring program called Island Sentinel. Karin Holser, a teacher on St. George Island in the Pribilofs, alerted authorities, and Michelle Ridgway, a Juneau-based biologist involved with a Pribilof science camp, responded quickly.

“She was the one who said, ‘This looks like a Baird’s beaked whale, but it doesn’t,'” said Phillip Morin, a research molecular geneticist with the National Oceanic and Atmospheric Administration and lead author of the new study.

The whale was about two-thirds the size of a Baird’s beaked whale, which typically grows to 35 or 40 feet, Morin said. It was clearly not a juvenile, as its teeth were worn and yellow, “so they were not baby teeth,” he said. Its skull had a distinct slope and its dorsal fin was different from that of the typical Baird’s beaked whale.

Tissue samples were sent to the Marine Mammal and Turtle Division of NOAA Fisheries’ Southwest Fisheries Science Center in California, where Morin works and where the world’s most extensive collection of cetacean tissues is kept. The whale’s skull was sent to the Smithsonian Institution in Washington — and students from the Pribilofs visited the lab there to take part in the examination.

DNA analysis showed it was a species different from the 22 previously known species of beaked whales in the world and the two known to swim in the North Pacific.

Read the full story at Alaska Dispatch News

Fisheries scientists to address flaws in past forage fish research

WASHINGTON (Saving Seafood) – May 2, 2016 – Dr. Ray Hilborn, a marine biologist and fisheries scientist at the University of Washington, has launched a new initiative aimed at addressing key issues surrounding forage fish science and the impacts of forage fishing on predator species. Dr. Hilborn’s Forage Fish Project is one of several scientific efforts occurring in the next few months to expand the existing body of scientific research on forage fish.

Comprised of 14 renowned fisheries scientists from around the globe, the Forage Fish Project held its inaugural conference last month in Hobart, Australia, where it identified shortcomings in the existing forage fish research. Specifically, it found several issues with work produced by the Lenfest Forage Fish Task Force, whose April 2012 report, “Little Fish, Big Impact,” concluded forage fish are vulnerable to overfishing, among other findings.

The Forage Fish Project, which includes two members of the Lenfest Task Force, began work to address these flaws, with the goal of producing an accompanying study later this year.

In Hobart, Project members found that most of the models used in previous forage fish studies, like the Lenfest Task Force report, left out factors such as the natural variability of forage fish stocks, and the extent of size overlap between fisheries and predators. The group also found multiple indications that the Lenfest study greatly overstated the negative impact of forage fishing on predator species.

“Most [food web] models were not built with the explicit intention of evaluating forage fish fisheries, so unsurprisingly many models did not include features of forage fish population biology or food web structure that are relevant for evaluating all fishery impacts,” according to minutes from the Hobart meeting.

Two upcoming fishery management workshops will also evaluate forage species on the East and West Coasts of the U.S., the first organized by the Southwest Fisheries Science Center and the Pacific Fishery Management Council. The workshop, which will be held in La Jolla, Calif., from May 2-5, will focus on how to improve stock assessment methods for northern anchovy and other coastal pelagic species. Attendees will evaluate model-based assessment approaches based on routinely assessed pelagic species from around the world, consider non-assessment approaches to estimate fish stocks, and develop recommendations for how the SWFSC should evaluate coastal pelagic fish stocks in the future.

A similar forage fish workshop will be held May 16-17 in Portland, Maine. This workshop will focus on Atlantic herring, with the goal of establishing a rule to specify its acceptable biological catch (ABC), the recommended catch level for any given fish species. An effective ABC rule will consider the role of Atlantic herring in the ecosystem, stabilize the fishery at a level that will achieve optimum yield, and address localized depletion in inshore waters.

Ultimately, these various forage fish workshops and projects are striving to use the best available science to update previous research and determine sound management practices for forage species.

Read the full minutes from the Forage Fish Project conference in Hobart, Australia

Learn more about the upcoming coastal pelagic species workshop in La Jolla, Calif.

Learn more about the upcoming Atlantic herring workshop in Portland, Maine

In Mexico, Fish Poachers Push Endangered Porpoises to Brink

March 1, 2016 — In 2013, Song Shen Zhen, a 75-year-old resident of Calexico, California, was attempting to re-enter the United States from Mexico when border patrol noticed a strange lump beneath the floor mats of his Dodge Attitude. The plastic bags beneath the mats contained not cocaine, but another valuable product: 27 swim bladders from the totoaba, a critically endangered fish whose air bladders, a Chinese delicacy with alleged medicinal value, fetch up to $20,000 apiece. Agents tracked Zhen to his house, where they discovered a makeshift factory containing another 214 bladders. Altogether, Zhen’s contraband was worth an estimated $3.6 million.

The robust black market is grim news for totoaba — but it’s an even greater catastrophe for vaquita, a diminutive porpoise that dwells solely in the northernmost reaches of the Gulf of California, the narrow body of water that extends between the Baja Peninsula and mainland Mexico. Since 1997, around 80 percent of the world’s vaquitas have perished as bycatch, many in gill nets operated by illegal totoaba fishermen.

Today, fewer than 100 vaquitas remain, earning it the dubious title of world’s most endangered marine mammal. Scientists fear the porpoise could vanish by 2018. “The possible extinction of the vaquita is the most important issue facing the marine mammal community right now,” says Barbara Taylor, a conservation biologist with the U.S. National Oceanic and Atmospheric Administration’s Southwest Fisheries Science Center.

The vaquita — “little cow” in Spanish — is a creature of superlatives. Not only is it the most imperiled cetacean, it is also the smallest, at less than five feet long from snout to tail, and the most geographically restricted: Its entire range could fit four times within Los Angeles’ city limits. Prominent black patches ring its eyes and trace its lips, giving Phocoena sinus a charming, panda-like appearance. The porpoise, which typically travels in pairs or small groups and communicates using rapid clicks, is famously cryptic; conservationists recently went two years without documenting a single sighting. Some Mexican fishermen insist the vaquita is already extinct, photographic evidence notwithstanding.

Read the full story at Yale Environment 360

Sturgeon Tag Find Brings NOAA Scientists to California School

October 30, 2015 — A green sturgeon tag is a real find, for a kid on the beach and for NOAA scientists.

Ethan Mora and Liam Zarri, researchers from NOAA’s Southwest Fisheries Science Center in Santa Cruz, woke up early on a recent October morning to gather critical scientific data on green sturgeon. But they weren’t off to some remote research station; they were going to an elementary school in Napa to reward one of the students with $20 for finding a lost satellite tag.

Deja Walker, a third-grade student at Napa Valley Boys and Girls Club, was strolling with her grandparents on Stinson Beach near San Francisco in early October when she noticed some boys throwing around what looked like a toy. When the kids tossed it aside, she investigated and found the nearly foot-long tube offered a reward for its return to NOAA.

What Deja didn’t know was that she had found one of several satellite tags used by NOAA researchers to understand the impact of commercial halibut fishing on green sturgeon, one of nature’s most prehistoric fish.

Green sturgeon are bottom feeders, scavenging on invertebrates and small fish. They can grow to about eight feet in length and live for about 70 years. Although they spawn in fresh water, the adults may travel up and down the West coast from Mexico to Alaska.

Sturgeon have meandered throughout our oceans and rivers since dinosaurs roamed the Earth. But despite their long history, one population of green sturgeon in California may be edging closer towards extinction. The southern population, or those green sturgeon that spawn in the Sacramento River basin, were listed as threatened under the Endangered Species Act (ESA) in 2006 because of the loss of historical spawning habitat.

Read the full story at The Fishing Wire

 

Large numbers of Guadalupe fur seals dying off California

LOS ANGELES, Calif. (AP) — September 29, 2015 — ” Scientists are looking at ocean-warming trends to figure out why endangered Guadalupe fur seals are stranding themselves and dying in alarming numbers along the central California coast.

Approximately 80 emaciated fur seals have come ashore since January ” about eight times more than normal ” leading the National Oceanic and Atmospheric Administration this week to declare an “unusual mortality event” for the animals. The classification diverts additional resources to study the animals, which have been traditionally under-researched, officials said.

Researchers will try to determine if the die-off is a result of a disruption in the seal’s feeding patterns from a large-scale warming of the Pacific Ocean, Toby Garfield, an official with NOAA’s Southwest Fisheries Science Center, said Tuesday.

Read the full story from the Associated Press at the New Bedford Standard-Times