New grant to “fill gap” in sardine stock assessment

New aerial surveys of sardines off Southern California will address fishermen’s concerns that sardine abundance estimates are effectively “missing California fish.”

Collaborative Fisheries Research West has awarded a $16,000 grant to a California sardine industry group to help pay for two spotter-pilot surveys. The first survey is being flown this summer and the second will occur in the spring of 2014.

The project’s leaders hope to use digitally enhanced photos of fish schools taken during the flights to develop a scientifically rigorous method for calculating sardine abundances. If this can be done, they will ask the Pacific Fishery Management Council, which manages the Pacific sardine fishery with NOAA Fisheries, to consider including California aerial survey data into its future stock assessments, from which harvesting limits are set.

Read the full article here.

California Department of Fish and Wildlife pilot Tom Evans (left) flies transects while spotter Devin Reed (right) identifies sardine schools, which are then photographed. Credit: K. Lynn/CDFW

Environmental cost of conservation victories

In recent years, Marine Protected Areas (MPA), where fishing is severely restricted or not allowed, have become the Holy Grail of marine conservation for both nongovernmental organizations and governments. In the United States, the Papahānaumokuākea Marine National Monument in the NW Hawaiian Islands became the first large-scale reserve closed to fishing in 2006 (1). This reserve is 90% the size of California and was followed by the Pacific Remote Islands Marine National Monument, about half the size of California, in 2009 (2). In total, the United States has established MPAs 19-times the size of California or roughly the area of the Continental United States.

The United States is not alone. The South Georgia and South Sandwich Islands Marine Protected Area in British sub-Antarctic waters is roughly 2.5-times the area of California, and most recently Australia has declared its economic zone in the Coral Sea a no-take area of 3.1 million square kilometers, an area eight times the size of California. All of these areas are heralded as great conservation victories and the Convention on Biodiversity has set a target of 10% of the ocean protected by 2020.

Are these indeed victories? Not necessarily. I suggest it is likely that the world’s environment is actually worse off once such victories are evaluated globally.

Read the full article here.

Harvard study finds eating tuna, mackerel, swordfish boosts memory

Eating tuna could boost memory and slow age-related mental decline, say researchers from Harvard Medical School.

They looked at the diet of 6,000 women with an average age of 72 and monitored them for nearly ten years, measuring their memory and mental ability at different points.

The women who ate tuna, mackerel or swordfish once a week had significantly better verbal memory compared to women who did not regularly eat the fish. There were no links between memory and consumption of light-meat fish or shellfish. It’s thought the benefits are down to the high omega-3 content in tuna and mackerel — other studies suggest this may help boost memory.

Read the full story here.

Sperm as superfood? It’s a healthy snack for squid and other critters

Certain females consume male ejaculate and sperm as if they were food, using the nutrients to fuel their own bodies as well as their eggs, according to new research.

The study, published in the journal Biology Letters, adds yet another dimension to the battle between the sexes.

“If males have their sperm consumed, rather than used for egg fertilization, they will lose that reproductive opportunity. Therefore, it is in the male’s best interests to try to ensure at least some of his sperm reaches the female’s eggs,” lead author Benjamin Wegener, a researcher at Monash University’s School of Biological Sciences, explained to Discovery News.

Read the full story here.

The southern bottletail squid occupies the waters off the coast of Australia.

Acidifying Oceans Could Spell Trouble for Squid

Acidifying oceans could dramatically impact the world’s squid species, according to a new study led by Woods Hole Oceanographic Institution (WHOI) researchers and soon to be published in the journal PLOS ONE. Because squid are both ecologically and commercially important, that impact may have far-reaching effects on the ocean environment and coastal economies, the researchers report.

“Squid are at the center of the ocean ecosystem—nearly all animals are eating or eaten by squid,” says WHOI biologist T. Aran Mooney, a co-author of the study. “So if anything happens to these guys, it has repercussions down the food chain and up the food chain.”

Research suggests that ocean acidification and its repercussions are the new norm. The world’s oceans have been steadily acidifying for the past hundred and fifty years, fueled by rising levels of carbon dioxide (CO2) in the atmosphere. Seawater absorbs some of this CO2, turning it into carbonic acid and other chemical byproducts that lower the pH of the water and make it more acidic. As CO2 levels continue to rise, the ocean’s acidity is projected to rise too, potentially affecting ocean-dwelling species in ways that researchers are still working to understand.

Mooney and his colleagues—lead author Max Kaplan, then an undergraduate student from the University of St. Andrews in the U.K. and now a WHOI graduate student, and WHOI scientists Daniel McCorkle and Anne Cohen—decided to study the impact of acidifying seawater on squid. Over the summer of 2011, Mooney and Kaplan gathered male and female Atlantic longfin squid (Loligo pealeii) from the waters of Vineyard Sound and transported them to a holding tank in the WHOI Environmental Systems Laboratory. When these squid mated and the females laid their egg capsules—each of which can contain 200 to 300 fertilized eggs—the researchers transferred some of the capsules to one of two smaller tanks filled with Vineyard Sound seawater.

Read the full story here.

Adult Atlantic longfin squid (Loligo pealeii) are ecologically and economically important in the northern Atlantic Ocean. The research team gathered adult squid in Vineyard Sound to study how their hatchlings respond to normal and acidified ocean conditions in the lab. (Tom Kleindinst, Woods Hole Oceanographic Institution)

Fishery Management: An Analysis of Fish Stock Assessments

Center for American Progress

Counting Fish 101

An Analysis of Fish Stock Assessments

George Lapointe, Linda Mercer, and Michael Conathan   

Science is integral to fishing operations. Without the ability to estimate how many fish exist in the ocean there’s no way to determine how many of them we can catch while allowing the remaining fish populations to stay viable. But fish live in a mostly invisible world beneath the ocean surface, they move around constantly, and they eat each other.

This creates a dynamic population structure that’s incredibly difficult to track, making fish virtually impossible to count. Thus, fisheries scientists—like political pollsters or other statisticians—must rely on imperfect data to make their predictions about the status and health of fish populations.

They take these data—some of which they collect, some of which come from fishermen—and plug them into scientific models which, in turn, create estimates of population health. Because the entire population of a given species is frequently divided into subpopulations known as “stocks,” these estimates are called “stock assessments,” and they form the backbone of modern fishery management in the United States.

These assessments provide an estimate of the current state of a fish population and, in some cases, forecast future trends. This tells us whether fishery management goals are
being met and indicates the type of conditions to which the fishery will have to adapt in the near future. In an ideal world, scientists would have the resources to provide managers with updated stock assessments for each species every year, but their expense and complexity mean they can only be updated periodically.

Regardless of how frequently they can be updated, strong, science-based stock assessments are the key to future sustainability, not just of the fish but also of the fishing industry. Fishing is an inherently unstable business, yet strong, accurate science can give fishermen a better understanding of whether their resource will remain healthy, and if it does, how many fish they will be allowed to catch. This in turn allows fishermen to make informed business decisions and stabilizes coastal economies.

Read the full report here.

Sea Level’s Rise Focus of Summit

Projections of dramatic change draw group to UCSD to strategize about vulnerabilities of affected areas

LA JOLLA — Climate researchers, social scientists and policy experts from across the Pacific Rim convened at UC San Diego last week to get ahead of seas projected to rise so dramatically that they could create some of the most visible effects of global warming.

Representatives from about 20 leading research universities and nonprofit groups in South Korea, Russia, Indonesia and elsewhere met to prepare for potentially catastrophic effects on 200 million people and trillions of dollars of coastal assets.

Sea levels off most of California are expected to rise about 3 feet by 2100, according to recent projections by the National Research Council. Higher seas create challenges for port cities from San Diego to Singapore, including the potential for dramatically increased damage to coastal roads, homes and beaches — especially during storms.

“All future development has to be assessed in regards to future rises in sea level,” Steffen Lehmann, professor of sustainable design at the University of South Australia, said during the conference. “Reducing the vulnerabilities of urban (areas) is the big topic, the big task ahead of us now.”

Potential responses include managing a retreat from eroding bluffs and reshaping coastal areas to buffer development from higher water levels. “The missing link (is) between the science and those guys in planning offices and architecture firms and city municipal offices,” Lehmann said.

David Woodruff, director of the University of California San Diego’s Sustainability Solutions Institute, organized the workshop to address that problem with cross-disciplinary discussions that move toward international action.

“We are trying to affect societal change,” he said. “The sooner we start scoping options, the less expensive it will be to save current infrastructure.”

The workshop was sponsored by the Association of Pacific Rim Universities, a consortium of 42 leading research institutions. Participants drafted a report about rising sea levels for top university leaders so they can make the topic a priority with national-level leaders around the Pacific Rim.

“I really think universities can play a key role,” said UC San Diego’s Charles Kennel. “They are right at the pivot point between connecting knowledge to action. … One of the places they need to transfer their knowledge to is adaptation to climate change.”

A warming climate causes sea levels to rise primarily by heating the oceans — which causes the water to expand — and by melting land ice, which drains water to the ocean. Sea levels at any given spot depend on a complex interaction of factors, such as ocean and atmospheric circulation patterns and tectonic plate movements.

Global sea level has risen about 7 inches during the 20th century, the National Research Council said.

While sea-level-rise projections aren’t a sure thing, they are widely accepted by mainstream scientists. Skeptics see it as a waste of money to plan for problems that may not materialize for decades, or may be more modest than predicted.

Read more on the Union-Tribune San Diego.

KUOW (NPR) Radio – Ray Hilborn on Overfishing: How Big Is The Problem?

Fish is a significant source of protein in the human diet; around 90 million tons are caught every year. Are some fisheries in danger of collapse? What species are being managed the right way? UW professor and fisheries expert Ray Hilborn talks to David Hyde about his new book “Overfishing: What Everyone Needs To Know.”

Listen to the full interview here via KUOW NPR – 94.9 FM (Seattle).

Ray Hilborn is a professor of fisheries at the University of Washington. Reporter Ross Reynolds hosts this fast–paced news call–in program. Engaging, stimulating and informative – a forum where listeners have the chance to speak directly with experts on news–oriented topics. The Conversation covers the very current topics and issues of the day.

Whales Show Signs of Coping With Man-Made Noise Underwater

By WILLIAM J. BROAD | Senior Science Writer

Perhaps we can save the whales — or at least their hearing.

International Efforts to Assess the Status of Pacific Sardine Stocks

Fisheries Resources Division

Scientists from the U.S. and Canada are working together to strengthen Pacific sardine stock assessments.  SWFSC scientists conduct regular Pacific sardine stock assessments to determine harvest guidelines for this economically important species.  In May, Canadian and NMFS scientists, together with independent experts, considered how to integrate data from Fisheries and Oceans Canada’s West Coast Vancouver Island swept-area trawl survey (WCVI) into the Pacific sardine stock assessment.

Preliminary results of the review suggest that including the Canadian survey data could strengthen and enhance the U.S. stock assessment in the future, especially as the survey evolves. Inclusion of the Canadian survey into the assessment may provide valuable insights into the northern most extension of the Pacific sardine population, the largest size classes, and the timing and extent of migration during different years. The Pacific Fishery Management Council will consider whether to incorporate the Canadian data into the U.S. stock assessment based on the independent review results. The earliest the data could be incorporated would be for the 2014 fishing season.

For more information on SWFSC’s coastal pelagic research programs, please visit the Fisheries Research Division

Management information on Pacific sardine in U.S. waters may be found at the Council’s website: http://www.pcouncil.org/coastal-pelagic-species/background-information/