Saving Seafood

Why Do Whales Migrate? They Return to the Tropics to Shed their Skin, Scientists Say

February 24, 2020 — The following was released by NOAA Fisheries:

Whales undertake some of the longest migrations on earth, often swimming many thousands of miles, over many months, to breed in the tropics. The question is why—is it to find food, or to give birth?

In a research paper in Marine Mammal Science, scientists propose that whales that forage in polar waters migrate to low latitudes to maintain healthy skin.

“I think people have not given skin molt due consideration when it comes to whales, but it is an important physiological need that could be met by migrating to warmer waters,” said Robert Pitman, lead author of the new paper and marine ecologist with Oregon State University’s Marine Mammal Institute. He was formerly with NOAA Fisheries’ Southwest Fisheries Science Center in La Jolla, California.

More than a century ago, whalers recognized that most whales that forage in high latitudes migrate to the tropics for calving. Scientists have never agreed on why. Because of their size, large whales should be able to successfully give birth in frigid polar waters. Due to reduced feeding opportunities in the tropics, most whales fast during their months-long migrations.

So why go to the trouble?

Read the full release here

Pelagic survey highlights NOAA’s growing collaborative relationship with industry

August 30, 2017 — Earlier this year, officials with the National Oceanic and Atmospheric Administration used the Lisa Marie, a private fishing boat, to collect data for its annual coastal pelagic species survey. The move was part of an effort to increase collaboration between the public and private sectors.

Earlier this summer as officials with the U.S. National Oceanic and Atmospheric Administration completed work on an annual survey of coastal pelagic species (CPS) in the Pacific Ocean, they received some assistance from a new source: the private sector.

Not only were representatives from the West Coast seafood trade industry on board a federal vessel for five days while survey samples were taken, but one fisherman allowed NOAA officials to outfit his boat with equipment to survey more shallow waters near the coastline. The collaborative venture marked a milestone in a public-private dialogue that’s been going on for years.

The CPS survey collects data primarily on Pacific sardines, said Kristen Koch, the acting science and research director of NOAA’s Southwest Fisheries Service Center in La Jolla, California, but it also includes observations on other CPS fish such as northern anchovy and jack and Pacific mackerels. Typically, officials use the Reuben Lasker, a NOAA vessel, to conduct the survey. However, private sector representatives felt the government was missing out on some key data in their work.

Government leaders welcomed the idea to get more data to fill in the gaps they also sought to fill.

“Data is like gold to us,” said Koch. “If we can collect more of the kind of data we need, it improves the precision of our assessments of these species.”

Read the full story at Seafood Source

Fishermen See ‘Science in Action’ Aboard NOAA Survey Ship

August 18, 2017 — Each spring and early summer, scientists set out along the West Coast aboard NOAA vessel Reuben Lasker to survey coastal pelagic species, or CPS, which includes small schooling fish such as northern anchovy, Pacific sardine, and jack and Pacific mackerels.

This year, with the help of West Coast fishermen, the scientists tested a new approach to extend their reach into nearshore waters to improve the accuracy of the survey results. The collaboration involved the fishing vessel Lisa Marie, of Gig Harbor, Washington, and brought two commercial fishermen aboard Lasker for an inside look at NOAA Fisheries surveys that inform stock assessments and guide decisions on how many fish can be caught by West Coast fishermen.

The idea emerged years before when the then-Director of NOAA’s Southwest Fisheries Science Center in La Jolla, California,  Cisco Werner, along with Deputy Director Kristen Koch and Fisheries Resources Division Director Gerard DiNardo, discussed the potential collaboration with Mike Okoniewski of Pacific Seafood and Diane Pleschner-Steele of the California Wetfish Producers Association.

Werner has since been named Chief Scientist of NOAA Fisheries.

The Magnuson-Stevens Fishery Conservation and Management Act requires NOAA Fisheries to use the best available science to help managers set catch limits and prevent overfishing. Annual surveys, using echosounders to detect and measure the abundances of CPS populations off the coasts of California, Oregon, Washington, and Canada’s Vancouver Island help fulfill this mandate. NOAA Fisheries also uses trawl catches, and fish-egg samples to help gauge fish reproduction and population trends.

“Acoustic-trawl surveys are our principal tool for monitoring the various species and determining how their abundances, distributions, and sizes are changing,” said David Demer, the Chief Scientist of the survey and leader of the Advanced Survey Technologies Group at Southwest Fisheries Science Center in La Jolla. “The surveys are very rigorous because they’re very important to our mission.”

Read the full story from NOAA’s Southwest Fisheries Science Center

Scientists, fishermen fight to save leatherback sea turtles

October 11, 2016 — Despite strict protections off the West Coast, leatherback turtles are in danger in other parts of the Pacific, scientists and fishermen said at a conference called to celebrate California’s official marine reptile.

The meeting, held in La Jolla last week, offered a status update on the ancient marine species, in advance of California’s Pacific Leatherback Conservation Day on Oct. 15. With populations down by more than 90 percent since the 1980s, the animals are ranked as one of eight marine species at greatest risk of extinction, according to the National Oceanic and Atmospheric Administration’s National Marine Fisheries Service.

Fishermen and researchers say that U.S. fishing limits designed to keep leatherbacks from getting caught in nets may unintentionally lead to more ensnarement in countries where rules are looser. For the globally roaming species, it will take more than one country’s efforts to stave off extinction.

Leatherbacks are ocean-going leviathans that can weigh up to a ton, and swim nearly 7,000 miles across the Pacific, devouring jellyfish.

Read the full story at the San Diego Union-Tribune

IATTC fails to adopt tuna conservation measures, makes shark progress

July 5, 2016 — The annual meeting of the Inter-American Tropical Tuna Commission (IATTC) ended on 1 July in La Jolla, California, without the adoption of new measures for the management of tropical tuna and for the conservation of bluefin tuna, though progress was made on shark conservation and on fishing aggregating device (FAD) management.

Members of the Regional Fisheries Management Organization (RFMO) responsible for the conservation and management of tuna and other marine species in the Eastern Pacific Ocean could not agree on the recommendations by scientific experts to extend the fishing closure for bigeye and yellowfin tuna to a total of 82 days in order to ensure sustainable fisheries in the region while accommodating for the recent increase in fleet capacity.

These discussions will resume at an extraordinary meeting to be held in October.

Read the full story at Seafood Source

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