Saving Seafood

Gulf of Maine Longline Survey in Rocky Habitats Now in Sixth Year

February 21, 2020 — For fisheries managers around the world, trawl gear is an efficient way to sample species inhabiting the sea floor or the benthic column above. Depending on the size of the net, grid surveys will capture enough of the animals in the area at the time to compile data used in abundance models that go into stock assessments.  Unless the fish swim out of the net before it is hauled. Or unless the sea bottom is rocky or pinnacled.

In those areas, longline gear can help fill in the blind spots for regional surveys. Longline gear can be lain across rock piles, and retrieved without destroying the gear itself. It differs from a trawl net in several ways: the longline has baited hooks distributed evenly across its length, it is stationary, anchored to the sea floor with location buoys at the sea surface at each end, and it can be deployed by smaller vessels.

Read the full story at Seafood News

Gulf of Maine Longline Surveys Target Species in Rocky Habitats

February 19, 2020 — The following was released by NOAA Fisheries:

Abundance, distribution, age, and other data are vital for assessing and managing important fish species. To obtain these data, the Northeast Fisheries Science Center’s Cooperative Research Branch works with commercial fishing vessels to conduct annual spring and fall bottom longline surveys in the Gulf of Maine.

The longline survey uses random stratified sampling to detect the abundance and distribution of fish species and how they are changing over time. It focuses on areas where researchers know less about some species and the rougher terrain makes it harder to sample with trawl gear.

The team spent several days this fall staging the 50-foot F/V Mary Elizabeth in Scituate, Massachusetts and 40-foot F/V Tenacious II in East Dennis. In just over 3 weeks, they completed the planned 45 stations on November 2, in a typically breezy New England autumn.

Weather was also on their side in the spring. On May 7, they had completed the 45 stations in the survey in about 2 weeks. To take advantage of the limited fair weather windows that occur during seasonal transitions, each vessel makes multiple 2–4 day trips.

Read the full release here

Listening for Right Whales in the Gulf of Maine

February 18, 2020 — The following was released by NOAA Fisheries:

Two passive acoustic data collection efforts are underway in the Gulf of Maine to gather information on North Atlantic right whales. One will deploy fixed archival-acoustic recorders mounted on the ocean bottom for a specific period of time. The other will use autonomous underwater vehicles called gliders, equipped to record acoustic information and report it back in near real-time.

“Real time monitoring provides the opportunity for direct conservation action through alerting vessels to the presence of endangered whales and to slow down to avoid striking the whales, while archival monitoring helps build a long-term 24/7 picture of their presence,” said Sofie Van Parijs, who leads the Passive Acoustic Research Group at the Northeast Fisheries Science Center.

“These new efforts will support routine passive acoustic monitoring of North Atlantic right whales and other baleen whale species throughout priority areas, and improve our understanding of changes in their movement patterns,” she said.

Right whales have changed their historic migration patterns in recent years, and tracking them is a difficult task.

Like most whales, this species does not spend much time on the ocean surface where they can be seen by researchers during aerial or ship-based surveys. Sound is the whale’s primary means of communicating, so if they are present in an area, they are probably making sounds. Underwater microphones can detect those sounds and even report back to researchers in near real-time.

Passive acoustic monitoring – detecting and recording sounds, in this case underwater – offers scientists another tool for learning about whale behavior and migration patterns. Advanced underwater microphones or hydrophones and autonomous underwater vehicles can detect and record those sounds. Computer programs help differentiate species and indicate time, direction and location.

These instruments can remain in the water continuously for months at a time. Along with visual sightings made from ships and aircraft, the sound recordings are revealing information about where and when whales of various species are present.

Read the full release here

Researchers Return to Study Gray Seal Pups in New England

February 6, 2020 — The following was released by NOAA Fisheries:

It’s gray seal pupping season in New England! NOAA researchers are working with colleagues to gather data from pups on Muskeget and Monomoy islands off the southeastern Massachusetts coast.

Pupping season generally runs from mid-December to early February, peaking in mid-January. Our researchers have conducted studies of animal abundance, distribution, and health on the islands in January for the past eight years. One research team is working on Muskeget Island off Nantucket, the largest gray seal breeding and pupping colony in the United States. Another team is on Monomoy, an island near Chatham on Cape Cod that is part of the Monomoy National Wildlife Refuge.

Kimberly Murray, who coordinates the seal research program at the Northeast Fisheries Science Center’s Woods Hole Laboratory and leads the team on Muskeget Island, outlined the teams’ goals. “We plan to place 20 satellite tags and nine acoustic tags on the weaned gray seal pups, and to collect as many health samples from pups as we can. Our goal is to sample 50 pups on Muskeget and 100 on Monomoy, but that depends on factors such as weather conditions, scheduling, and departure of weaned pups.”

The team also sampled 14 weaned gray seal pups on Seal Island in Maine. They placed five satellite tags and two acoustic tags on seal pups there to learn where those pups go. On January 30 researchers sampled and tagged 15 gray seal pups on the Coskata-Coatue Wildlife Refuge, which includes Great Point Light, on Nantucket and collected scat or seal poop for microbiome/microplastics/food habits work.

Read the full release here

Updated Shark Tagging Atlas Provides More than 50 Years of Tagging and Recapture Data

February 3, 2020 — The following was released by NOAA Fisheries:

A 52-year database of the distribution and movements of 35 Atlantic shark species revealed new information on some of the least known species. It also uncovered a few surprises about where sharks go and how long they live.

Scientists collected data for sharks tagged and/or recaptured between 1962 and 2013. The sharks were found in the Atlantic Ocean and associated areas, including the Gulf of Mexico, the Caribbean Sea, and the Mediterranean Sea. Participants tagged a total of 229,810 sharks of 35 species and recaptured 13,419 sharks of 31 species in that time span. The scientific journal Marine Fisheries Review recently published the data.

This new atlas updates an earlier version covering 1962 to 1993 and adds information on 22 species. Detailed profiles are provided for 14 shark species, including bull and tiger sharks and smooth dogfish. The updated data significantly extended their known ranges and movements.

The Cooperative Shark Tagging Program is the largest and longest-running in the world. The program is a collaborative effort among recreational anglers, the commercial fishing industry, biologists, and NOAA Fisheries. Its goal is to study the life history of sharks in the Atlantic Ocean.

Initiated in 1962 by biologist and shark researcher John “Jack” Casey at the Northeast Fisheries Science Center, the original group of 74 volunteer anglers began participating in the project in 1963. Since then the program has expanded to include thousands of participants along the entire North American and European Atlantic coasts, including the Gulf of Mexico.

“The program’s long-term data has shown the importance of tagging large numbers of each species and recording information in a database to determine shark movements,” said Lisa Natanson, a shark researcher in the Apex Predators Program at the Northeast Fisheries Science Center’s Narragansett Laboratory in Rhode Island. For example, until the tagging program was 34 years old, no one knew that tiger sharks cross the Atlantic.

Read the full release here

Surveys Collect Data Year-Round on Marine Life along U.S. East Coast

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

While the weather outside may be frightful this time of year, Northeast Fisheries Science Center researchers continue collecting data from planes, ships, and underwater.

Many of the studies are part of the Atlantic Marine Assessment Program for Protected Species, or AMAPPS. This multi-year program is funded by NOAA, the Bureau of Ocean Energy Management, the U.S. Fish and Wildlife Service, and the U.S. Navy. Researchers put information about abundance, distribution, ecology, and behavior of protected species—from whales, dolphins, and seals to marine turtles and seabirds—into an ecosystem context. This helps resource managers with conservation measures and decision-making.

Aerial Surveys

NOAA Fisheries scientists and colleagues from state and non-profit organizations conducted aerial surveys in the Northeast region through December 2019. Flights will resume on February 1. The focus is on right whale sightings in and near Nantucket Shoals, where many whales have been aggregating recently. We will also survey other areas where right whales were seen in the past.

Two recent aerial surveys used NOAA Twin Otter aircraft. The Northeast center’s aerial whale survey team conducts one based at Air Station Cape Cod. Center staff and colleagues from other marine research organizations conducted a survey specifically for AMAPPS last fall, based at Barnstable Municipal Airport in Hyannis, Massachusetts.

AMAPPS surveys moved to southeast U.S. waters off Florida and Georgia in early December and will continue there through the end of January 2020.

Read the full release here

Growing body of evidence makes case for offshore mussel farming

January 16, 2020 — Calling it “an opportunity too good to ignore,” NOAA scientists are giving a thumbs-up to offshore mussel farming in the Northeast United States based on new research and a trove of data. The news signals a step forward on how to chip away at the $15 billion US seafood trade deficit.

Serial entrepreneur Phil Cruver claimed “first mover” status in the space in 2012 when he founded the 100-acre Catalina Sea Ranch off Long Beach, California. Despite waves of publicity since, regulatory and funding concerns have given entrepreneurs the jitters such that only research trial farms have followed.

But this new strong scientific basis for offshore mussel farming could be the first step in changing all that.

The researchers at the Milford Laboratory, part of NOAA’s Northeast Fisheries Science Center, have authored a series of papers—including one yet-to-be-published—that give prospective aquaculture entrepreneurs “fundamental knowledge” for farm planning, as well as a broad overview of environmental, economic, and social issues.

Read the full story at Aquaculture North America

Scientists Work to Save World’s Smallest Sea Turtle

January 9, 2020 — The combination of the curving shape of Cape Cod, the region’s strong winds and currents, and the rapid cooling of the ocean in October and November make for a deadly threat to the rarest and smallest sea turtle on Earth.

That’s the problem being addressed by a series of research projects conducted by an oceanographer at the Northeast Fisheries Science Center in Woods Hole, Mass., and a doctoral student at the University of Rhode Island. The scientists used satellite-tracked oceanographic instruments called drifters to determine where Kemp’s ridley turtles that are late to return south in the fall are most likely to float ashore near death along the Cape Cod shoreline.

The critically endangered turtles lay their eggs on beaches on the Gulf Coast of Mexico in a mass nesting event called an arribada. After spending their first few years far offshore in the Sargasso Sea near Bermuda, many of the young turtles visit the waters of the Gulf of Maine to feed on crabs and other small marine creatures that live on the seafloor.

“There are little warm water bridges from the Gulf Stream that come up here, and we think some of the turtles are riding those into the area,” URI student Felicia Page said. “The problem comes when those little bridges close off and the water in Cape Cod Bay and the Gulf of Maine stay warm, which keeps the turtles here longer than they should instead of heading south in September.”

Read the full story at EcoRI

Atlantic Halibut Subject of NOAA Research

December 9, 2019 — NOAA Fisheries is working with fishermen across Cape Cod to see if the Atlantic halibut is showing signs of recovery in the Gulf of Maine as well as the New England region.

A three-part study is currently underway to see if the halibut population is rebuilding after the size of the fish shrunk over centuries.

The Northeast Fisheries Science Center is working with local fishermen to understand the life history, stock structure, and movement patterns of the Atlantic halibut.

Read the full story at CapeCod.com

Learning More About Atlantic Halibut: Fishermen and Scientists Go “Under the Hood”

December 4, 2019 — SEAFOOD NEWS — A three-part study is underway to better understand life history, stock structure, and distribution of Atlantic halibut along the U.S. east coast. The study is being done by the Northeast Fisheries Science Center (NFSC) and The Cape Cod Fishermen’s Alliance with support from a Saltonstall-Kennedy grant developed by The Nature Conservancy.

Atlantic halibut was a reliable commercial fishery for nearly three centuries, but today is only commercially viable off the Canadian east coast. Commercial stocks in Canada appear to be increasing in recent years. The Canadian stock is fished on the southern Grand Banks and Scotian Shelf, extending to the northern edge of Georges Bank and in the Gulf of Maine. U.S. fishermen targeting other species are seeing more Atlantic halibut and wonder if stocks may be returning to U.S. waters as well.

Fishermen in Cape Cod and researchers at the NFSC want to know basic life history, stock structure, and where Atlantic halibut go during the year and during their lifetimes. The NFSC is helping with the life history component, especially reproductive biology.

That part of the study is focused on three questions: When and where do halibut spawn? Is there one overall population in the region, or are there several populations?  And when do they mature?

“We would catch maybe 6 to 12 halibut a year in our scientific surveys during the last decade,” said Rich McBride, head of the NFSC’s Population Biology Branch. “That was not nearly enough for a study about the animal’s life history. We needed more samples than what we were catching.”

Two years ago the New England Fishery Management Council gave special permission for study participants to take up to six halibut per trip, exceeding the current trip limit of one.

The study needed 450 to 500 more samples from about 250 fish. Alliance members hit that target this year. They have provided about half the samples available for the study.

The Alliance, based in Chatham, Massachusetts worked with researchers to provide training to fishermen on collecting biological data. Fishermen learned how to gather samples from the heart, spleen, gonad (reproductive organ), earbones (for aging), and a fin clip. They recorded fishing location, the time, and the length and weight of the fish.

“When fishermen caught halibut in the course of a fishing trip, they would collect the samples,” explained George Maynard, research and policy coordinator for the Alliance. “Back on shore, I would collect the samples from the fishermen and bring them back to the lab for preservation and archiving. The tissue samples were all preserved and shipped to our collaborators in Canada for genetic analysis.”

Maynard prepared gonad samples and brought them to McBride at the NEFC for processing. McBride and his colleagues want to get an idea of each halibut’s maturity status.

“To get at those answers, we’re looking at developing eggs ‘under the hood,’ at the cellular level,” said McBride. “Having some sense of their current life history would be helpful as we move forward.”

“The next steps will be to combine these data with the length/weight and time of capture data from the fishermen, and aging data from the Massachusetts Division of Marine Fisheries,” said Maynard. “That will allow us to build a clearer picture of the size and age at which halibut reach maturity, and what time of year they spawn.”

The other two parts of the three-part study include a stock structure analysis using genetic samples led by the Bedford Institute of Oceanography in Halifax, Nova Scotia. The University of Massachusetts-Dartmouth’s School for Marine Science and Technology is leading a satellite-tagging effort to understand halibut habitat use and distribution.

This story was originally published on SeafoodNews.com, a subscription site. It is reprinted with permission.