Østerskaller sælges for en høj dollar, mens biologer kæmper for at beskytte skaldyrsenge

Bådkaptajnen sad på toppen af ​​kragereden på en lille pram, og skærmede sine øjne mod julisolen og kastede sit blik mod tumulten nedenfor.

Brummen fra tungt udstyr og klapren fra østersskaller brød morgenens stilhed, da arbejdsmandskaber stablede tusindvis af pund tørrede skaller på dækket og skabte til sidst en høj 12 fod høj.

Da den sidste granat var blevet placeret på bunken, manøvrerede kaptajnen prammen væk fra Russ Point Landing og ned ad en tidevandsbæk nær Fripp Island på en mission for at redde vilde østers.

Det statsstøttede arbejde var en del af en indsats for at beskytte truede østerspopulationer ved at returnere skaller fra restauranter, østerssteg i baggården og andre kilder til tidevandsområder. Ved at lægge skaller tilbage i mudderet genopbygges revene, de refugier, babyøsters har brug for for at vokse og formere sig.

Men bestræbelser på at genoprette østersrev på steder som Beaufort County står over for en trussel, der kan påvirke stort set alle, der er afhængige af høsten af ​​vilde østers.

South Carolina og nærliggende stater har problemer med at finde de skaller, de skal sætte tilbage i tidevandsområder for at genoprette østersbestanden.

På et tidspunkt, som blev betragtet som havaffald, er østersskaller blevet en værdifuld - men begrænset - vare langs den sydatlantiske kyst.

"Dette er afgjort et multi-state, nationalt problem:at finde skaller," sagde Ben Dyar, en østersspecialist ved South Carolina Department of Natural Resources.

Uden tilstrækkelige forsyninger af skaller kunne østerspopulationer lide, hvilket begrænser den kommercielle høst og øger prisen på skaldyr i restauranter. Færre østersrev og lavere bestande kan også betyde mere forurenede vandveje, fordi østers filtrerer forurenende stoffer fra vandet.

Der er flere årsager til manglen på skaller, herunder den vejafgift, som overhøst har taget gennem årene i de sydatlantiske stater. Men folk smider også skallerne efter at have serveret østers i fiskehuse eller ved lokale østerssteg. Folk bruger skaller til at bane indkørsler og forbedre haver. Og de knuser skaller for at sælge til kyllingefoder eller som ingredienser i kosmetiske produkter.

Manglen er så udtalt, at nogle stater har brugt millioner af dollars gennem årene på at købe skaller for at restaurere og genopbygge østersrev - nogle gange konkurrerer de om de begrænsede skaller, der tilbydes af at smide huse fra Texas til Virginia.

Priserne er steget fra et godt stykke under en dollar per skæppe for to årtier siden til mange gange mere end i dag. Prisen løber nu fra $3 til $7 pr. skæppe, siger nogle rystede husejere og statslige dyrelivsembedsmænd.

South Carolina, med store moser og hundredvis af fiskerestauranter, bruger i gennemsnit omkring 100.000 USD årligt på at købe skaller fra andre stater, ifølge South Carolina Department of Natural Resources.

Alt i alt har staten ved hjælp af en række forskellige finansieringskilder brugt næsten 1 million dollars siden 2012 på at erhverve mere end 407.000 skæpper østersskaller, hvilket svarer til omkring 22 millioner pund ifølge DNR.

South Carolina havde betalt mindre end $3 pr. skæppe, men gennemsnitsprisen er steget over $3 i de seneste to år, siger DNR.

Konkurrencedygtigt marked

Masser af andre stater er også sultne efter østersskaller.

Georgia bruger omkring $138.000 årligt på at købe skaller og transportere dem til Peach State. Skaller kommer ofte fra Florida og nogle gange Texas.

Nogle af de største udgifter på den sydlige Atlanterhavskyst er omkring Chesapeake Bay i Maryland og Virginia.

Virginia bruger 2 til 3 millioner dollars årligt på at købe østersskaller fra instate shucking houses og andre kilder i staten, sagde statens embedsmænd der.

Maryland har endda købt jernbanevogne med fossile østersskaller fra Florida for at hjælpe med deres østersrestaureringsprogrammer i Chesapeake Bay, hvor østersbestanden er faldet fra historiske niveauer.

"Det hele er skørt," sagde Ted Wilgis, en østersrevspecialist hos nonprofitorganisationen North Carolina Coastal Federation. "Det blev bare en budkrig."

Nogle stater, herunder South Carolina, har for nylig haft større succes med at købe skaller end North Carolina, fordi Tar Heel State har en grænse for, hvor meget den kan bruge. I Georgien siger embedsmænd, at det ikke altid er let at finde østers, når de vil købe dem.

"Østerskaller er blevet en værdifuld vare, hvor efterspørgslen langt overstiger udbuddet," sagde Cameron Brinton, en havbiolog med Georgias Coastal Resources Division.

Østers, som vokser i de fleste kystområder i USA, har en livscyklus, der afhænger af tidevandet og hvor succesrige larveøsters er til at finde hårde overflader.

Baby østers, lidt mere end utydelig goo efter gydning, flyder på tidevandet og holder sig til hårde overflader, lige fra eksisterende østersrev til kajpæle eller brostøtter. In South Carolina, this process occurs during the spring and summer.

Once attached, they nestle into cracks and crevices, where they form their own shells and grow up.

But the best hard surfaces for baby oysters to stick to are existing oyster reefs, experts say.

'Shells are the profit'

Jeff Milliken's family has run oyster shucking businesses for more than 60 years in the coastal crossroads of Shallotte, North Carolina, selling canned oysters to grocery stores and restaurants.

Oyster sales always kept his family business afloat, providing a decent living for the Millikens.

But for years, oyster shells left over from the shucking process were little more than waste material. Piles of oyster shells at the shucking house were virtually given away.

That began to change in the 1980s, as people increasingly sought to buy the shells, Milliken said. And that has enriched his family business.

The company sometimes sells what it calls scoops of oyster shells, the amount that can be held in the bucket of a front-end loader, for about $500. In the 1980s, the charge was closer to $50, he said.

"My dad always made the point that the oysters pay the bills and the shells are the profit," Milliken, 60, said. "The shells have become very lucrative."

The South Carolina Department of Natural Resources buys large amounts of Milliken's shells to restore oyster beds.

"South Carolina has pretty much bought all of our production for reseeding the beds in South Carolina," Milliken said. "We do sell to the public but not like we used to. A lot of it is held for the state of South Carolina."

In addition to buying shells from people like Milliken, states are trying to re-use oyster shells, rather than letting them be dumped in landfills and in the woods, or crushed and used to pave driveways.

Commercial harvesters who lease oyster grounds from state agencies for private use often must put back a substantial percentage of oyster shells after they pluck shellfish from the mud.

Some states have launched oyster shell recycling programs that encourage restaurant owners to hold the shells until state natural resources officials or environmental groups can pick them up and replant them on public oyster grounds in the wild—as the South Carolina DNR did this summer near Fripp Island in Beaufort County.

State agencies and environmental groups from Maryland to Georgia have established shell drop-off sites on the coast for people who haul whole oysters home for backyard and community oyster roasts. State officials and volunteers then pick up shells at these drop-off sites and return them to marshes and sounds.

Additionally, some states have begun to allow oyster farming that could offset losses from wild populations.

Meanwhile, in North Carolina, Virginia and Maryland, resource managers are working to establish artificial reefs to offset the shortage of oyster shells and replenish wild shellfish populations near the Outer Banks and in the Chesapeake Bay.

For those reasons, oysters aren't likely to disappear from the landscape as a result of the shell shortage, many natural resources officials say. But losing wild oyster reefs could deplete the populations, they say. Even with some success from artificial oyster reefs, returning shells to the wild is generally considered the best way to replenish and enhance natural reefs, some experts say.

Some restaurant owners say it's vital to recycle oyster shells.

"If oysters are harvested but none of the shells are recycled," Hilton Head Island restaurateur and chef Chris Carge said, "the oyster seeds are just going to drift away" and eventually, the local oyster population will dwindle significantly.

Should oyster populations drop because there aren't enough shells to restore wild populations, it could diminish local fishing economies, drive up oyster prices for restaurants, hurt water quality and affect other marine species that thrive around oyster reefs, state officials say.

In South Carolina, for instance, more than 100 species of marine animals rely on oyster reefs for survival. These mounds of shells, which are submerged below the water at high tide, provide habitat for small bait fish, which then attract larger, popular sports fish, including red drum, sea trout and flounder, according to the state Department of Natural Resources.

Commercially caught oysters generate a dock value, or wholesale value, of some $3 million annually in South Carolina, making oysters the state's fourth-largest fishery, the DNR said in a report last winter.

Without an adequate supply of shells to replenish populations, oyster harvesting seasons might need to be shortened, a change sure to upset commercial and recreational fishermen.

"At some point, it is very plausible that there would have to be other measures and other tools taken to help manage that resource, meaning closing areas down for harvest for longer periods of time," Dyar said, noting it could have a corresponding effect on oyster prices.

Maintaining healthy oyster populations also is important because they filter out pollution in water, keeping tidal creeks cleaner.

Chicken feed and makeup

Perhaps the biggest reason for the lack of shells is historic over-harvesting in some areas, as well as the decline of shucking houses in others.

The Nature Conservancy found that 85% of the world's oyster reefs have been lost since the late 1800s because of over-harvesting, pollution and other factors, according to a South Carolina Sea Grant Consortium report.

Places like South Carolina also no longer have canneries where large supplies of oyster shells could be found to return to the salt marshes for restoration. At one point the state had 16 canneries, but the last one closed in 1986, according to the state DNR.

Some years, it is harder to find shells than in other years, depending on how many oysters are harvested. Beyond that, the lack of oyster shells may result, in part, from the public's increasing appetite for buying oysters in the shell, rather than in cans, and demand by a variety of businesses.

Poultry farms, construction companies and cosmetics manufacturers are among businesses that use oyster shells in their products. The calcium in oyster shells is believed to enhance many products, prompting efforts to find shells and grind them up.

Some poultry farmers purchase chicken feed supplements made from oyster shells. When fed to chickens, crushed oyster shells are believed to make egg shells harder.

Lesa Vold, a spokeswoman for the Egg Industry Center, said egg farmers like shell-based feed, but also are using other sources of calcium in places where shells are hard to find. The center supports egg producers across the country.

Milliken said his company for years sold crushed oyster shells to farm supply stores for sale to chicken farmers.

"We crushed just a huge amount of them," he said. "It's the best calcium for chicken egg-laying there is."

One marketing study, released this summer, said the oyster shell calcium market is expected to grow by 5% by 2030, fueled by an array of industrial demands for shells. Calcium carbonate in oyster shells is highly sought after, the study said.

The study, cited on the website Researchandmarkets.com, says oyster shell powder is useful in some skin-care products.

Worldwide, some manufacturers harvest oyster shells, crush them and blend them into facial cleansing powder, soaps and shampoo, according to a June 8 story on the website Premiumbeautynews.com.

Backyard oyster roasts

Another issue has arisen that has depleted the amount of oyster shells available to replenish wild populations.

Many shells are being scattered across the countryside, rather than returned to the salty tidelands of the southern Atlantic coast, after restaurants serve them or neighbors hold backyard oyster roasts.

Oysters harvested from the black pluff mud of Charleston may wind up sold to seafood markets whose customers are from Columbia, Greenville, Florence or Rock Hill. Those shells often are discarded in landfills or other places miles away from the coast.

"Quantities spread throughout the state (make) it a lot more difficult to capture that shell and bring it back to the coast," Dyar said in a report to the DNR board earlier this year.

It's difficult to say how many oysters have been removed from bays and creeks across the southeast and hauled inland, but natural resource managers say it's a problem, despite their best efforts.

South Carolina has one of the region's most robust shell recycling programs, with 30 sites where people can drop off shells after they've eaten oysters. Most of the sites are along the coast, although the DNR has them in Columbia and Greenville, as well. Once the shells are picked up, they are kept at multiple locations for months to dry out, which kills bacteria inside the shells.

But the state only captures about 12% of the shells that are harvested annually, meaning 88% of the shells from oysters sold in South Carolina are not recycled, according to a report by the S.C Department of Natural Resources.

Jean Fruh, executive director of The Outside Foundation, said the smell of keeping the oysters for typical once-a-week pickup, the cost, and additional training scare away some restaurant owners. However, the cost, Fruh and participating restaurateurs will tell you, is nominal:about $150 a month.

She said it's worth it.

"If you don't have oysters, you don't have fish, shrimp and crab," she said, because oysters create a critical habitat for the three during their juvenile period.

About 65 South Carolina restaurants collect shells for recycling, most of them in the Charleston area. Only a handful are in the Hilton Head Island and Myrtle Beach areas, according to the DNR.

Despite the struggle, natural resource managers in multiple states say they're still trying to maintain habitat for oysters, either through the use of artificial reefs, tighter laws on shell disposal, or recycling.

Dyar, the state DNR oyster specialist, said South Carolina's recycling program offers the best hope of maintaining enough oyster shells to replant in the marshes.

"We have seen over the last several years that sources are starting to become more scarce and the shells are becoming more expensive, causing an even more critical need for us to increase shell recycling within the state," Dyar said.

Oysters needed

During the July oyster planting trip, Michael Hodges, an oyster restoration biologist with the state DNR, directed the operation in the summer heat.

Hodges and his work partner, Kevin Swain, pushed the pile of oysters onto the barge with a front end loader. After the barge hauled its cargo to the destination point, a man aboard the barge fired a water cannon at the mound of shells, scattering them into the salt marsh at high tide.

It took only 20 minutes to lay the shells in about seven feet of water along a salt marsh bank. When the tide went out, the fruits of everyone's labor were obvious—a 390-yard line of human-planted oyster shells. It is expected to take about two years for a full row of mature oysters to develop.

Over the summer, the DNR set out to plant 10,000 bushels—or 550,000 pounds—of oyster shells in Beaufort waters, another 5,000 in Georgetown and 27,000 in Charleston.

Hodges said the program works—if the state has enough shells.

Without them, "we would see a decrease in the health of the oysters but also the health of the estuary, since they're so tied to habitat, water quality and all the ecosystem services that they provide," Hodges said. + Udforsk yderligere

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