Saving Seafood

Chesapeake Bay Dead Zone Smaller Than Previous Years Due To Mild May Temperatures

June 29, 2022 — Researchers are predicting this summer’s dead zone in the Chesapeake Bay will be smaller than the long-term average taken between 1985 and 2021, according to environmental staff.

The change in size is due to the below-average amount of water entering the bay from the watershed’s tributaries this past spring, Chesapeake Bay Program staff said.

Program staff made the announcement alongside researchers from the University of Maryland Center for Environmental Science, the University of Michigan, and U.S. Geological Survey.

Decreased nutrient and sediment pollution from jurisdictions within the watershed also contributed to the smaller dead zone, staff said.

The dead zones consist of areas of low oxygen, known as hypoxic regions. This is where there are dissolved oxygen concentrations of less than two milligrams per liter— primarily caused by excess nutrient pollution flowing into the bay, staff said.

Read the full story at CBS Baltimore

Tracking Fish in the Chesapeake Bay Helps Researchers and Resource Managers

March 2, 2022 — Equipment recently deployed in the Chesapeake Bay is already giving scientists and resource managers insight into fish behavior. Arrays of acoustic telemetry receivers let researchers know when fish that have been tagged swim near the receivers. The data is helping researchers increase knowledge about fish, their migrations, and how they use different habitat areas in the Chesapeake Bay.

Acoustic Receivers Around the Bay

The NOAA Chesapeake Bay Office (NCBO) is working with partners to help researchers get data from five groups of receivers. Three arrays form gates across strategic points in northern, middle, and southern bay.

Northern Array 

The northern array includes four receivers across the Bay near the Chesapeake Bay Bridge, close to Annapolis. This array, funded by NCBO, is operated in partnership with the Maryland Department of Natural Resources.

Southern Array 

This array is composed of 12 receivers near Virginia Beach. It is also funded by NCBO and is operated in partnership with the Virginia Marine Resources Commission.

Mid-Bay Array

This array of six receivers is managed by the University of Maryland Center for Environmental Science. It’s located near the mouth of the Patuxent River, on Maryland’s Western Shore.

NOAA Chesapeake Bay Interpretive Buoy System

All five buoys currently deployed in the NOAA Chesapeake Bay Interpretive Buoy System are outfitted with receivers.

Choptank River

We have placed three receivers in the Choptank River near oyster restoration projects. These receivers are on loan from NOAA Fisheries’ Northeast Fisheries Science Center.

Read the full story at NOAA Fisheries

5-Year Reviews for the Gulf of Maine, New York Bight, and Chesapeake Bay Distinct Population Segments (DPS) of Atlantic Sturgeon

February 17, 2022 — The following was released by NOAA Fisheries:

Today, NOAA Fisheries is releasing the 5-Year Reviews for the Gulf of Maine, New York Bight, and Chesapeake Bay Distinct Population Segments (DPS) of Atlantic sturgeon. These reviews summarize and evaluate new information on the status of each DPS and its major threats, using new data that has become available since the DPSs were listed in 2012.

Each DPS continues to be at a low level of abundance, and stressors including bycatch, vessel strikes, habitat loss and alteration, and global climate change lead us to recommend that the Gulf of Maine DPS remains listed as threatened, and the New York Bight and Chesapeake Bay DPSs remain listed as endangered. The reports further identify recommendations for future actions to promote the recovery of each of the Gulf of Maine, New York Bight, and Chesapeake Bay DPSs of Atlantic sturgeon. The 5-year reviews for the Carolina and South Atlantic DPSs of Atlantic sturgeon are on-going.

 

Researchers Study the Effects of Harmful Algal Blooms

December 1, 2021 — The sample bottle came back from the river, over the gunwale, and into the boat. The water sample was a dark reddish-brown, like strong, steeped tea that you are unable to see through. Literally tens of thousands of algal cells made up every drop of the water sample. Back at the laboratory, scientists at the Virginia Institute of Marine Science (VIMS) will analyze the sample to determine the type and density of algal species in the water. The samples, taken from the York River in the Southern Chesapeake Bay allow scientists to study harmful algal blooms, also called HABs. According to NOAA’s National Centers for Coastal and Ocean Science, almost every state in the nation now experiences some kind of HAB event. The number of hypoxic water bodies in the United States has increased 30 fold since the 1960s, with more than 300 coastal systems now impacted.

As you might guess from the name, the tiny microscopic organisms making up HABs are algae, which are a very diverse group of organisms. Phytoplankton are a type of algae usually responsible for creating blooms. Most often, these phytoplankton are made up of an equally diverse group of organisms known as dinoflagellates, which can be found in both fresh and marine waters.

Blooms Occur Worldwide

HABs are a growing concern worldwide, occurring in the Gulf of Mexico and surprising places such as the Alaskan Arctic. Globally warming water temperatures, a result of our changing climate, is one reason blooms are occurring more frequently and over a global scale.

Read the full story at NOAA Fisheries

Researchers map best conditions for forage fishes in the Chesapeake

October 28, 2021 — Big fish eat smaller fish, but only if there are smaller fish to eat. A new study led by researchers at William & Mary’s Virginia Institute of Marine Science maps the conditions most suitable for key species of forage fishes in the Chesapeake Bay, offering guidance for any future efforts to protect or restore the habitat required to yield sufficient prey for predatory fishes such as striped bass.

Lead author on the study, which appears in the October issue of Frontiers in Marine Science, is Dr. Mary Fabrizio, a professor and chair of Fisheries Science at VIMS. Co-authors are fellow VIMS researcher Dr. Troy Tuckey, along with Drs. Aaron Bever and Michael MacWilliams of Anchor QEA, LLC. Bever is a VIMS alum.

“Small fishes such as bay anchovy are important components of the diets of predatory fishes in Chesapeake Bay,” says Fabrizio, “but factors that affect local abundances of these  fish have been largely unexplored.”

To throw light on these factors, the research team set out to quantify and map suitable habitats for four common species of forage fishes in Bay waters, and to assess the relationship between habitat extent and fish abundance. In addition to bay anchovy, the forage species studied were juvenile spot, juvenile spotted hake, and juvenile weakfish.

The team based their study on data generated by counting the number of forage fishes caught in a trawl net during fishery surveys conducted by VIMS and the Maryland Department of Natural Resources between 2000 and 2016. These surveys sample at more than 100 sites throughout the Bay each month. They coupled these catch data with output from computer models simulating the environmental conditions at each sampling site. These conditions include water depth and temperature, salinity, stratification, dissolved-oxygen levels, and current speeds. The researchers also noted whether the bay floor beneath each net tow was sandy or muddy, and the distance to the nearest shoreline.

Read the full story at Phys.org

Fishery managers set deadline on rockfish rebuild

October 27, 2021 — At its 2021 Annual Meeting last week, the Atlantic Striped Bass Board of the Atlantic States Marine Fisheries Commission (ASMFC) took a positive step toward rebuilding our beloved rockfish stock from its currently depleted condition.

The move came in response to news from the Maryland Department of Natural Resources (MD DNR) that its 2021 Juvenile Striped Bass Index was 3.2, well below the annual average of 11.4 for the third consecutive year. In fact, it
has been below average for ten of the past 16 years. Virginia’s index of 6.30 was closer to, but still below, its long-term average of 7.77.

Concern about rockfish has been building for at least five years, and ASMFC’s Striped Bass Board initiated development of a new amendment (number 7, but the first since 2003) to the fishery management plan last winter. The Board’s May meeting sketched out six priorities for the Commission’s Plan Development Team to build into the amendment. The team submitted its draft for Board approval at last week’s meeting.

Read the full story at Chesapeake Bay Magazine

 

Maryland oyster industry hoping for rebound as new season begins

October 26, 2021 — This time last year, Jason Wilford was preparing to bring his farm-grown oysters to a Thanksgiving pop-up sale in Easton.

Events like that one were something of a lifeline for Wilford, a newcomer to the industry. With the coronavirus pandemic raging as the weather grew colder in the fall of 2020, many seafood restaurants were closed or offered only carryout. There was practically nowhere for his first batch of hand-raised oysters to go.

Experts say covid-19 depressed demand for oysters, in part because shucking them wasn’t popular among diners looking for quick to-go meals. That sank prices for harvesters on the Chesapeake Bay.

This year, aquaculture farmers such as Wilford and those in the rest of the oyster industry — watermen, seafood restaurants and distributors — are hoping for a rebound in demand.

Read the full story at the Washington Post

Virginia’s striped bass forecast looks stable as juvenile numbers hold steady

October 20, 2021 — Juvenile striped bass numbers are holding steady in Virginia’s Chesapeake Bay tributaries, the latest annual survey by the Virginia Institute of Marine Science found.

But a parallel survey in Maryland waters showed below-average numbers.

The surveys look at striped bass that hatched in the spring and that will be large enough to catch, legally, in three to four years.

Preliminary results of the Virginia survey showed an average of 6.3 fish for each haul of a seine net in the James, York and Rappahannock rivers. These young striped bass usually measure between 1.5 and 4 inches. That’s the 9th consecutive year of average or above average results, VIMS said.

Read the full story and listen to the audio at the Daily Press

 

Maryland Striped Bass Survey Below Average for 3rd Year

October 19, 2021 — Maryland’s juvenile striped bass survey finds rockfish reproduction is below average for the third year in a row, continuing a worrisome trend. Virginia’s survey, meanwhile, shows a nine-year streak of average or above-average reproduction.

Both states conduct surveys of young-of-year striped bass to track reproductive success of the Bay’s treasured fish. The Maryland Department of Natural Resources (DNR) reports an index of 3.2 in the 2021 survey, which remains well below the long-term average of 11.4.

DNR is optimistic, saying in a press release, “The coastal striped bass population has decreased in size, but is still capable of strong reproduction with the right environmental conditions. Variable spawning success is a well-known characteristic of the species.”

They do acknowledge that the below-average numbers “are a concern”. In 2019 the Atlantic States Marine Fisheries Commission (ASMFC) determined the striped bass species was being overfished, and set new limits for East Coast states to follow. Still, some environmental groups and even anglers feel that states like Maryland should be doing more.

Read the full story at Chesapeake Bay Magazine

 

Biologists use trucks to help shad reach spawning ground

September 23, 2021 — The long-running effort to get American shad back to their historic spawning grounds this year enlisted a tool that had been abandoned two decades ago: trucks.

With operation of the multi-million dollar fish lifts halted at Conowingo Dam, biologists resorted to capturing shad below the dam and trucking them upstream before releasing the fish back into the Susquehanna River to continue their spawning migration.

By the time the trucks stopped running on June 5, they hauled more than 6,300 shad upstream. That’s a fraction of the number that swam upriver during historic shad runs, but it’s the most that got past the first three dams on the river in more than a decade.

And it wouldn’t have happened without the trucks. Fish lifts at the 94-foot-high dam have not operated for two years because of concerns that invasive species such as northern snakeheads and blue catfish were moving upstream through the fish lifts, too.

“From a shad perspective, we feel like in the short term it is best to get as many to the spawning grounds as we can,” said Sheila Eyler, who coordinates fish restoration efforts on the Susquehanna for the U.S. Fish and Wildlife Service.

American shad definitely needed the helping hand.

Read the full story at the Bay Journal