Saving Seafood

Toxin Taints Crabs and Kills Sea Mammals, Scientists Warn

November 4, 2015 — The authorities in California are advising people to avoid consumption of crabs contaminated by a natural toxin that has spread throughout the marine ecosystem off the West Coast, killing sea mammals and poisoning various other species.

Kathi A. Lefebvre, the lead research biologist at the Wildlife Algal Toxin Research and Response Network, said on Wednesday that her organization had examined about 250 animals stranded on the West Coast and had found domoic acid, a toxic chemical produced by a species of algae, in 36 animals of several species.

“We’re seeing much higher contamination in the marine food web this year in this huge geographic expanse than in the past,” Ms. Lefebvre said.

She said that the toxin had never before been found in animals stranded in Washington or Oregon, and that there were most likely greater numbers of contaminated marine mammals not being found by humans.

The California Department of Public Health recently advised people to avoid consumption of certain species of crabs because of potential toxicity. Razor clam fisheries in Washington have been closed throughout the summer for the same reason.

In a statement released on Tuesday, the California department said that “recent test results” indicated dangerous levels of domoic acid in Dungeness and rock crabs caught in California waters between Oregon and Santa Barbara, Calif.

Read the full story at The New York Times

US probes dolphin death after Navy uses sonar

November 4, 2015 — HONOLULU (AP) ” The National Marine Fisheries Service on Wednesday said it was investigating the death of two dolphins found washed ashore in California shortly after Navy ships were using sonar in nearby waters.

The animals are being analyzed to try to determine what caused them to get stranded, agency spokesman Jim Milbury said.

The dolphins were common bottlenose dolphins, Navy spokeswoman Lt. Julie Holland said. They were found Oct. 21 at Imperial Beach and at Silver Strand beach in San Diego.

Two Navy ships were using mid-frequency active sonar 80 nautical miles away from where the dolphins were found, Holland said. They used the sonar for slightly more than an hour over two days from Oct. 19.

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

 

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

 

Lingering drought heightens worries of extinction for salmon

October 28, 2015 — SAN FRANCISCO (AP) – Another deadly summer of drought has heightened fears of extinction in the wild for an iconic California salmon, federal officials said Wednesday.

Officials with the National Marine Fisheries Service said preliminary counts indicate that hot, shallow waters caused by the drought killed most of this year’s juvenile winter-run Chinook before they made it out to the Pacific Ocean.

It “doesn’t look very good,” said Garwin Yip, a federal fisheries spokesman.

If a final count this winter confirms the bad news, it would mean a second straight summer in which 5 percent or less of the young fish survived California’s drought.

Since the fish spawn on a three-year cycle, the die-off would make management of next year’s water critical for the salmon’s survival in the wild.

Read the full story from the Associated Press at New Jersey Herald

 

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

Navy, environmental groups settle lawsuit, limiting some training that harms whales in Pacific

September 14, 2015 — HONOLULU (AP) — The Navy agreed to limit its use of sonar and other training that inadvertently harms whales, dolphins and other marine mammals off Hawaii and California in a settlement with environmental groups approved Monday.

A centerpiece of the agreement signed by a federal judge in Honolulu includes limits or bans on mid-frequency active sonar and explosives in specified areas around the Hawaiian Islands and Southern California, Earthjustice attorney David Henkin said.

Sonar at a great distance can disrupt feeding and communication of marine mammals, and it can cause deafness or death at a closer distance, Henkin said.

In some cases, training exercises can kill. Four dolphins died in 2011 in San Diego when they got too close to an explosives training exercise, he said.

The Navy estimated it could inadvertently kill 155 whales and dolphins off Hawaii and Southern California, mostly from explosives. It estimated it could cause more than 11,000 serious injuries off the East Coast and 2,000 off Hawaii and Southern California.

Lt. Cmdr. Matt Knight, a U.S. Pacific Fleet spokesman, said the settlement preserves key testing and training.

Read the full story from the Associated Press at U.S. News and World Report 

 

In California’s Protected Waters, Counting Fish Without Getting Wet

September 8, 2015 — Diver Dan Abbott unloads his scuba gear on a beach in Monterey, Calif. — his tank, flippers and a waterproof clipboard covered in tally marks. He spent the morning counting fish: pile perch, black perch, blue rockfish and kelp rockfish are among the 150 fish he spotted.

Abbott is diving with a team from Reef Check California, a group of volunteers doing underwater surveys by counting everything in the kelp forest in Monterey Bay.

He’s part of an effort to determine whether there are more fish in the waters now than there were eight years ago. That’s when this kelp forest was set aside as a marine protected area, where there’s little or no fishing allowed, part of a huge experiment to restore marine life.

There are more than a hundred protected areas off California, covering 16 percent of state waters, and the only way to know if they’re working is for Abbott and others to keep checking the marine population year after year.

Read the full story at New York Now

Why Freezing Didn’t Keep Sushi Tuna Safe From Salmonella

September 2, 2015 — A recent outbreak of Salmonella in frozen tuna might have sushi lovers wondering if it’s safe to eat that raw fish.

The outbreak in question began in California in March. All told, it sickened 65 people in 11 states. There were 35 cases in California, with another 18 in Arizona and New Mexico. The rest of the cases were scattered across the country, including four in Minnesota.

Most of the victims interviewed by public health investigators said they’d eaten sushi made with raw tuna in the week before they became ill. It was the Minnesota Department of Health that discovered the outbreak strains of Salmonella in some frozen raw tuna imported from Indonesia. The California importer, Osamu Corp., had shipped the frozen tuna to sushi restaurants and grocery stores that make sushi throughout the U.S.

In late August, the Centers for Disease Control and Prevention announced that the outbreak was over. But the agency warned that some of the recalled tuna might still be lurking in the freezers of restaurants uninformed about the outbreak, so people could still get sick.

Read the full story at New York Now

Drought Forces Trout to Be Trucked From California Hatchery

August 13, 2015 — FRESNO, Calif. (AP) — Tons of rainbow trout had to be rescued from a Central California fish hatchery and moved by truck to cooler lake water, sparing them from the state’s relentless drought, wildlife officials said Wednesday.

About 80,000 pounds of trout were scooped up from the San Joaquin Hatchery near Fresno and hauled 30 miles uphill to Shaver Lake in the Sierra Nevada foothills. Temperatures in Millerton Lake, which flow through into the hatchery on the San Joaquin River, had reached nearly 70 degrees, threatening the trout’s survival, The Fresno Bee reported (http://bit.ly/1Ns8OG3 ).

“The drought is having a devastating effect,” California Department of Fish and Wildlife spokesman Andrew Hughan said. “We’re really making an effort to save as many fish as we can and get them into cold water before it gets any warmer.”

Read the full story from the Associated Press at The New York Times 

Climate change causes timing shifts in fish reproduction

August 10, 2015 — SAN DIEGO, Calif. — Research by Rebecca Asch, a recent graduate of Scripps Institution of Oceanography at UC San Diego, shows a strong correlation between warmer ocean temperatures and changes in the timing of fish reproduction.

The study, “Climate Change and Decadal Shifts in the Phenology of Larval Fishes in the California Current Ecosystem ,” was published in the July 9 early edition of the Proceedings of the National Academy of Science. This is the first study to examine the effects of temperature, upwelling, and abundance of zooplankton on fish phenology in the Southern California Current ecosystem.

Climate variability has changed the seasonal cycle of larvae production by fishes in the California Current. Such shifts in seasonal, biological processes are known as phenology. Changes in phenology are studied by scientists as a key way to assess the effects of climate change on a species.

There have been extensive studies on the phenology of terrestrial (land) species, but comparatively few studies on how climate variability affects seasonal behavior of marine species. Existing studies indicate that changes in seasonal cycles are occurring earlier in most terrestrial ecosystems. Climate change may cause the phenology of marine animals to change more rapidly than terrestrial species.

Unseasonably warm ocean temperatures may also affect migration patterns, bringing several marine species usually found in regions closer to the Equator closer to Southern California. In February, a pod of false killer whales were seen from the Scripps Pier; this was the first time these whales have been seen north of central Baja California.

Read the full story at Phys.org