Saving Seafood

D.B. Pleschner: Nearshore anchovy abundance not proof fishery is collapsing

November 2, 2017 — Recently, Dr. William Sydeman of the Farallon Institute, published a study claiming that the abundance of anchovy near shore — especially in places like Monterey — is evidence that the population is collapsing.

Sydeman’s logic is based on an old argument that collapsed populations always shrink inshore. But there’s one big problem with that theory — it’s unsupported by scientific evidence. In fact, that logic was based on an old sardine theory that has since been debunked. There’s certainly no evidence that low anchovy biomass results in an increase in anchovy in the nearshore area of Central California.

In fact, the opposite is likely true. According to the Monterey Herald, the anchovies that flooded into Monterey Harbor in September were 3 inches long. Pete Guglielmo, an anchovy processor in Monterey, exclaimed, “Inside Monterey harbor and the outer break wall, you can walk on 3-inch anchovy. What a sight to see! They are running the air pumps in the harbor to keep them alive.”

In other words, the abundance of 3-inch (young-of-the-year) anchovy in the nearshore region implies that there is a strong 2017 year-class. A record abundance of young-of-the-year also was documented in scientific cruises going back to 2015, as well as observed by fishermen in both northern and southern California.

Read the full story at the Monterey Herald

 

‘Rule of Thumb’ Management Approach Is Wrong For Forage Fish, Dr. Ray Hilborn Tells U.S. Senate Subcommittee

WASHINGTON (Saving Seafood) – October 31, 2017 – At a hearing of the U.S. Senate Commerce Subcommittee on Oceans, Atmosphere, Fisheries and Coast Guard last week, respected fisheries scientist Dr. Ray Hilborn testified that fisheries managers “can do better than a one-size-fits-all” approach to managing forage fish. He also said there was “no empirical evidence to support the idea that the abundance of forage fish affects their predators.”

Dr. Hilborn’s comments came in response to questioning from Sen. Roger Wicker (R-MS) about whether fisheries managers should manage forage fish according to a “rule of thumb” approach, where fisheries are managed according to a set of broad ecological and management principals, or a “case-by-case” approach, where management is guided by more species-specific information.

Dr. Hilborn, a professor at the University of Washington’s School of Aquatic and Fishery Sciences, was part of a team of top fisheries scientists that recently examined these issues, as well as what effects fishing for forage fish species had on predator species. Their research indicated that previous studies, like a 2012 report from the Lenfest Forage Fish Task Force, may have overestimated the strength of the predator-prey relationship.

Before the hearing, Dr. Hilborn spoke with Saving Seafood about his research and his message for lawmakers.

“It’s very clear that there really are no applicable rules of thumb, that every system is independent [and] behaves differently, and we need to have the rules for each individual forage fish fishery determined by looking at the specifics of that case,” Dr. Hilborn told Saving Seafood.

He also discussed his team’s finding that forage fish abundance has little impact on their predators. They looked at nearly all U.S. forage fish fisheries, including the California Current system and Atlantic menhaden, and concluded that predator species generally pursue other food sources when the abundance of any one forage species is low.

“The predators seem to go up or down largely independent of the abundance of forage fish,” Dr. Hilborn said, adding, “For Atlantic menhaden, for their major predators, the fishery has reasonably little impact on the food that’s available to them.”

Another key message Dr. Hilborn had for the Subcommittee was that fisheries managers must determine what they want to accomplish so that scientists can advise them accordingly.

“The time has come to refocus our fisheries policy on what we actually want to achieve because rebuilding is only a means to an end,” Dr. Hilborn told Saving Seafood. “Do we want to maximize the economic value of our fisheries? Do we want to maximize jobs? Do we want to maximize food production?”

In his testimony, Dr. Hilborn praised U.S. fisheries policy that has “led to rebuilding of fish stocks and some of the most successful fisheries in the world.” He attributed this success to a variety of factors, including funding of NOAA, regionalizing fisheries management decisions, and requiring managers to follow science advice. As a result, overfishing should no longer be the top priority for fisheries managers, he testified.

“The major threats to U.S. fish stock and marine ecosystem biodiversity are now ocean acidification, warming temperatures, degraded coastal habitats, exotic species, land based run off, and pollution,” Dr. Hilborn testified. “Overfishing remains a concern for a limited number of stocks but should not continue to be the most important concern for U.S. federal fisheries policy.”

The hearing was the latest in a series examining reauthorization of the Magnuson-Stevens Fishery Conservation and Management Act, the nation’s supreme fisheries law. It was organized by subcommittee chairman Sen. Dan Sullivan (R-AK), and focused on fisheries science.

Watch the full hearing here

Boom and Busted: Lessons from Alaska’s Mysterious Herring Collapse

In trying to untangle a herring crash from the aftermath of the 1989 Exxon Valdez oil spill, scientists in Prince William Sound are revealing just how resilient – and unpredictable – marine ecosystems can be.

October 13, 2017 — ON A COLD day in June, Scott Pegau leans toward the passenger window of a Cessna floatplane and peers out at the teal waters of Prince William Sound. The glacier-rimmed pocket of seawater on the southern coast of Alaska is protected from the open ocean by a string of rugged islands. It is both moody and alluring. Clouds dally on the snowy peaks and fray against the forested hillsides. The sea is flat and frigid, except for a single row of waves lapping at the rocky shore.

Pegau aims his gaze at the shallow waters behind the breakers. After a few minutes of searching, above a deep bay on one of the outer islands, he finally spots what he’s looking for: a school of juvenile herring. Pegau can distinguish them from other schooling species by the unique way they sparkle – an effect produced by sunlight playing off their silver flanks as the fish bank and roll. Try as I might, I can’t make out any twinkling, just the inky splotch of a few tons of small fish swarming below the surface.

“Small H1,” Pegau says into the headset microphone, tucked snugly under his thick, gray mustache. That’s code for a small school of one-year-old herring. He enters the location on his computer; huddled in the back seat, I make a tick mark on the backup tally. It’s the first of dozens of schools we’ll see on our flight.

Pegau conducts these surveys every year in hopes of understanding what’s in store for the herring population in Prince William Sound. The fish mature and begin to join the spawning stock at the age of three, so the counts give scientists and managers a clue about how many adults may be coming up the pipeline. Researchers and fishers alike always hope the answer will be many. But every year for the past quarter century, they have been disappointed.

The herring population in Prince William Sound crashed in 1993, just four years after the Exxon Valdez oil spill released 11 million gallons of crude into these waters. The collapse put an end to an $8-million-dollar-a-year fishery, and left a hole in the middle of the marine food web. Scientists have spent years trying to understand if and how the spill played a role in the herring’s demise here, and the results have been hotly contested. All of the legal proceedings finally closed in 2015, with herring listed as an impacted species but with most herring fishers feeling poorly compensated.

Even more concerning is the fact that, unlike most species hit by the spill, the herring haven’t bounced back over the decades since. Populations of forage fish are known to boom and bust, so most scientists thought it was only a matter of time before they rebounded. But 25 years later, there’s still no sign of recovery on the horizon.

“There’s definitely a possibility that the ecosystem went through a tipping point,” says Pegau, who coordinates the herring program at the Prince William Sound Science Center, an independent research institute whose work is funded in part by money from the spill settlement. A host of factors, which scientists are still trying to untangle, could be to blame, from hungry whales to virulent disease. “There’s no one thing that’s keeping them down,” Pegau says. “I think pretty much everyone is convinced of that.”

Read the full story at News Deeply

Authors of Recent Research on Forage Fish Respond to Criticism from Lenfest Task Force

WASHINGTON – September 20, 2017 – In April, a team of respected fisheries scientists led by Dr. Ray Hilborn published a study that found fishing of forage species likely has a lower impact on predators than previously thought. This conclusion challenged previous forage fish research, most notably the 2012 Lenfest Oceans Program report “Little Fish, Big Impact,” which recommended leaving more forage fish in the water to be eaten by predators.

The Lenfest task force responded to this new research with a Letter to the Editor of Fisheries Research, where the Hilborn et al. study was published. In response to this letter, Hilborn et al. wrote their own letter, which was published August 5 in Fisheries Research and is reproduced below:

Our paper highlighted that key biological relationships between forage fish and their predators were not included in the models used in the LENFEST report. These missing elements were (1) the high level of natural variability of forage fish, (2) the weak relationship between forage fish spawning stock size and recruitment and the role of environmental productivity regimes, (3) the size distribution of forage fish, their predators and subsequent size selective predation and (4) the changes in spatial distribution of the forage fish as it influences the reproductive success of predators. We demonstrate that each of these elements can have a major impact on how one evaluates the impact of fishing forage species on their predators. The LENFEST report used EwE models without these factors to determine the very specific recommendations they made about how to manage forage fish.

We certainly agree that in some cases fishing forage fish will affect their predators, but in other cases there may be little if any impact – it all depends on the biology that was not included in the models used.

This critique of our paper suggests that we are offering alternative evaluation of the impact of fishing forage fish that are, like the LENFEST recommendations, broadly applicable. We make no such claim and much of their critique is against the straw man they have constructed. We are not arguing that fishing forage fish does not affect predators. Rather we show how, in specific cases, there may be little if any impact of fishing forage fish and that general conclusions simply are not possible.

We suggest that the very specific quantitative measures proposed in the LENFEST report result from models that do not have these components and that if these elements were included in the models the conclusions would likely be different. While the authors of the letter argue that they conducted a comprehensive literature review, the specific recommendations came from their modelling, and it is the modelling we criticize and their critique makes few attempts to defend.

We stated “Pikitch et al. (2012) argued forcefully that their analysis provided general conclusions that should be broadly applied. However, relevant factors are missing from the analysis contained in their work…” Their response is that their recommendations were “tailored to the level of uncertainty and data availability of each system.” What we refer as “general conclusions” contain a set of recommendations for three uncertainty tiers, but our point is that the biology of each system is different, not the availability of data or uncertainty, and the differences in biology should be considered when evaluating management options for forage fisheries.

The specificity of their recommendations is clear – for high information situations (which would include the California Current, Humboldt Current, NE Atlantic sand eel and herring) their recommendation is “In any case, lower biomass limits should not be less than 0.3 B0, an MAX F should not exceed 0.75 FMSY or 0.75 M.” These numbers are not the result of their case studies or literature review but the result of their models that did not include a number of important elements.

Finally, we agree that situations where detailed information is lacking are challenging for management, and that is why it is important to identify species and system attributes that make systems less resilient to fishing. Low trophic level species constitute the largest potential sources of increased fish production in the world and much of the recent suggestions for “balanced harvesting” relies on significant increases in exploitation rates on trophic levels associated with forage fish. Since almost all of these potential low trophic level species would be considered in the “low information tier” the LENFEST recommendation is that new fisheries not be allowed until sufficient data are collected. Given that few countries will devote resources to research on fisheries that do not exist, the LENFEST recommendation essentially says no new fisheries on these species, and thus in effect precludes development of what may be significant food resources.

We believe the authors of our paper and the LENFEST report all accept that in some cases predators may be highly dependent on forage fish, but in other cases there may be little dependence. Management should be based upon what is known about the dependence of the predators on forage fish and the relative importance the local agencies place on maintaining high predator abundance verses the benefits of full exploitation of the forage fish. The major forage fisheries of the world are very valuable and currently intensively studied. What is needed for each of these fisheries is a new set of models that incorporate the elements that were missing from the LENFEST analysis.

Ray Hilborn, Ricardo O. Amoroso, Eugenia Bogazzi, Olaf P. Jensen, Ana M. Parma, Cody Szuwalski, Carl J. Walters

Federal officials take first steps to protect chub mackerel, other forage species in the Mid-Atlantic

September 6, 2017 — For the first time, the National Marine Fisheries Service has taken action to protect forage species in the Atlantic Ocean.

The new regulation, initially approved last year by the Mid-Atlantic Fishery Management Council, covers such species as anchovies, herrings, mackerel, and sardines up to 200 miles off the coastline from New England to central North Carolina. The Fisheries Service, part of the National Oceanic and Atmospheric Administration, chose to protect the fish because of the important role they play in the ecosystem.

The fish, along with some crustaceans and mollusks, are considered prey for larger fish sought by commercial and recreational fishermen as well as marine mammals and birds.

Read the full story at Seafood Source

Mid-Atlantic Unmanaged Forage Omnibus Amendment Final Rule Published

August 25, 2017 — The following was released by NOAA Fisheries:

NOAA Fisheries announces a new rule to protect unmanaged forage fish. Forage fish are small schooling species that serve as prey for larger commercially and recreationally important fish, as well as for marine mammals and sea birds. Anchovies, herring, chub mackerel, and sardines are some common forage fish.

Commercial fisheries often catch forage fish, but we know little about the amount of forage species caught in Mid-Atlantic waters. Because of their importance to the food web, the Mid-Atlantic Fishery Management Council wants to protect the ecological role these species play in the Mid-Atlantic and to collect more information on catch. This new information will help inform future scientific assessments and management decisions.

This is the first rule in the Atlantic to list forage species as ecosystem component species. This action would set landing and possession limits for 17 species and species groups to prevent the expansion of directed commercial fisheries on these species in Mid-Atlantic federal waters (see map below).

Read the rule as filed in the Federal Register and the permit holder bulletins for commercial fishermen and for dealers.  Mid-Atlantic fishermen will receive a copy of a forage fish identification guide, which is also available electronically on the Mid-Atlantic Council’s website.

MASSACHUSETTS: Pogies have been abundant in North Shore waters

August 7, 2017 — I can’t remember the last time there have been so many pogies (Brevoortia tyrannus for you Latin fans) in the water. Huge schools of them can be found right now from Salem to Salisbury. The big stripers and tuna have just been feasting on them.

These fish, also known as menhaden on the South Shore, bunker further south and about thirty other names along the Atlantic coast from Nova Scotia to Florida, grow to roughly 15 inches in length and weigh in at about 1 pound. Native Americans in precolonial America called the fish ‘munnawhatteaug,’ which means ‘fertilizer.’

They are a rather oily forage fish with a scale-less head that composes about one-third of it’s body length, are fairly flat-sided with a deeply forked tail. They can range in color from dark blue, green, blue gray, or blue brown above, with silvery sides, belly, and fins, and with a strong yellow or brassy luster. There is a conspicuous dusky spot on each side close behind the gill opening, with a varying number of smaller dark spots farther back, arranged in irregular rows.

They feed in a rather unique manner. An adult pogy swims along with it’s tooth-less mouth wide open and its gills spread. As tiny plankton, annelid worms, and crustacea flow into the mouth they are caught in a whole series of very fine comb-like gill rakers. As they move through the ocean these small fish filter as much as 7 gallons of water per minute! Imagine how much water is filtered when a whole school is feeding.

They have no defense mechanism other than being hidden in a huge school. They are oil-rich so every prey fish in the ocean targets them. Pollock, cod, tuna, stripers, sharks, bluefish and swordfish all savage these schools. Menhaden are a major source of omega-3 fatty acids, which have been shown to cut risks of heart disease and possibly other diseases, such as Alzheimer’s.

Read the full story at the Newburyport Daily News

Forage Fish Should Be Managed on a Case-by-Case Basis: Menhaden Science Committee

Findings by ASMFC BERP Workgroup align with recent forage fish research by Hilborn et al.

WASHINGTON – July 31, 2017 – The following was released by the Menhaden Fisheries Coalition. Saving Seafood previously covered Hilborn et al., which found that previous forage fish research may have overestimated the impact of forage fishing on their predators. Saving Seafood also produced a video about the study, which can be found here:

Earlier this year, a team of scientists led by Dr. Ray Hilborn found, among other conclusions, that forage fish are best managed on a case-by-case basis that accounts for their unique environmental roles. In a memo earlier this month, an inter-state scientific review committee tasked with incorporating the ecological role of menhaden into management determined that this conclusion aligns with their own findings.

The Atlantic States Marine Fisheries Commission’s (ASMFC) Biological and Ecological Reference Points (BERP) Workgroup, which is leading development of ecosystem-based fisheries management for Atlantic menhaden, reviewed the Hilborn et al. paper earlier this summer. It concluded that the paper’s recommendation of using stock-specific models to evaluate ecosystem needs were similar to models being developed by the workgroup.

“The [workgroup] is currently developing a suite of intermediate complexity menhaden-specific models that align with the general recommendations from both Dr. Hilborn and the 2015 Stock Assessment Peer Review Panel,” said the July 14 memo, Review of Hilborn et al. 2017.[1] “The [workgroup] anticipates that these models will be ready for peer review in 2019.”

The Hilborn et al. study, published in April in Fisheries Research, found that there were several variables in forage fish species that make imprecise, one-size-fits-all management approaches difficult. Most importantly, there seems to be little correlation between the number of predator species in the water and the number of forage fish, making it nearly impossible to determine a catch level that is appropriate for forage fish as a whole. Other variables include the natural variability of forage fish, which is different from species to species, and relative locations of predators and forage species.

“We suggest that any evaluation of harvest policies for forage fish needs to include these issues, and that models tailored for individual species and ecosystems are needed to guide fisheries management policy,” the paper finds.

The ASMFC will consider the work of the BERP, including its review of Dr. Hilborn’s paper, at its upcoming 2017 summer meeting, to be held from August 1-3 in Alexandria, Virginia.

[1] ASMFC Biological Ecological Reference Points Workgroup, “Memorandum: Review of Hilborn et al. 2017,” July 14, 2017

What factors play a role in analyzing forage fish fishing regulation?

July 7, 2017 — The interaction of predators, fishing and forage fish is more complicated than previously thought and that several factors must be considered, says researcher.

The group of researchers was evaluating the interaction after results from an earlier report found that fishing of forage species had a large effect on predator population, said the Marine Ingredients Organization (IFFO). Those harvested fish are used in several areas including as feed ingredients.

The new study was initiated because there were some questions regarding the methods used in the initial project, said Ray Hilborn, with the school of aquatic and fishery sciences at the University of Washington and corresponding author.

“When the original Lenfest [Forage Fish Task Force] report came out, a few of us said it seemed that the methods they were using were not up to the questions they were asking,” he told FeedNavigator. The report also offered several policy recommendations, he added.

“It was on our radar screen,” he said. “And one of the things I’ve been interested in looking at is the intensity of natural fluctuation in populations, and forage fish are notable for how much they vary naturally.”

The interaction between forage fish populations and predators is more complicated than may have been suggested by earlier studies tracking that relationship, and several factors need to be considered when analyzing the role that fishing plays on that relationship, he said. “The key point isn’t that there isn’t an impact, but that you have to argue case-by-case,” he added.

Several factors need to be considered when assessing the interaction among predators, forage species, and fishing of those forage species, the researchers said in their study. “We show that taking account of these factors generally tends to make the impact of fishing forage fish on their predators less than estimated from trophic models,” they added.

Read the full story at Feed Navigator

LYNTON S. LAND: Bay fishery to keep deteriorating unless nutrients from land are addressed

June 28, 2017 — The March Bay Journal 2017 commentary, Don’t let menhaden become a case of could have, should have, would have, laments the decline in Bay menhaden populations and blames the reduced number of predatory “sport” fish on Omega Protein’s harvest.

The Atlantic States Marine fisheries Commission is quite clear this year that “Atlantic menhaden are neither overfished nor experiencing overfishing” (asmfc.org/species/atlantic-menhaden).

In Maryland, juvenile menhaden are sampled annually through the Estuarine Juvenile Finfish Survey. The index of juvenile menhaden has been low since 1992, and “environmental conditions seem to be a major factor driving recruitment.” (dnr.maryland.gov/fisheries/Documents/Section_4_Atlantic_Menhaden.pdf).

Something other than overfishing must contribute to, or even be responsible for, reduced Bay menhaden populations. I contend that the primary cause of depleted finfish stocks, including bottom-feeding fish like croaker that do not eat menhaden, and the menhaden themselves, is poor water quality, not overfishing.

As a child in the late 1940s, I recall visiting my uncle’s cottage on the water near Solomons Island, MD, where we caught large bluefish and rockfish. He would give me a quarter to pull up eelgrass from under his boat so the propeller wouldn’t chop it up and foul the engine’s water pump. Dense meadows of grass were obvious beneath the clear water. I doubt there is much eelgrass anywhere near Solomons Island today and Bernie Fowler’s “Wade-In” documents turbidity and the fact that there has been no recent improvement.

I moved to Virginia’s Northern Neck on the Little Wicomico River, near Smith Point, in 1998. At that time, I could exit the jetties and turn to the southeast into about 30 feet of water and easily catch large croaker, as well as spot, trout and flounder. I haven’t caught fish there, nor seen them on the depth sounder, in many years.

The pound nets nearby still catch menhaden for crab bait, although they are smaller than fish in the past. They no longer catch many “food fish.”

In about 2000, big Omega trawlers fishing for menhaden were common up to the Maryland-Virginia line. Now, I never see the trawlers and most of the plentiful menhaden are being caught outside the Bay, where the population is robust. In late summer, schools of Spanish mackerel and bluefish once chased bait on the bar west of Smith Point Light. Casting into the schools, as they were being worked by birds, or trolling beside them, was great fun and very productive. No more.

Spanish mackerel, my favorite fish, are no longer abundant and I rarely see birds actively working the water. Trolling for big rockfish was almost always successful a decade ago. Lately it is more often unsuccessful, although a few are still being caught.

Read the full opinion piece at the Bay Journal