North Carolina State University engineers have created a non-toxic ship hull coating that resists the build up of barnacles.

Barnacles that colonize the hull of a ship augment the vessel’s drag which in turn increases fuel consumption. After no more than six months in salt water, the fuel consumption of a ship has normally swelled substantially, forcing the ship owner to either spend more money on fuel or to remove the ship from the water and place it in a dry dock where it can be cleaned. Both alternatives are naturally costly, and for many years ship owners fought barnacles by regularly coating ship hulls with substances toxic to barnacles. Unsurprisingly, these substances turned out to be toxic to a wide range of other marine life as well, including fish, which caused most countries to ban their use.

Ships are not the only ones colonized by barnacles. In the wild, it is common to see barnacles attached to a wide range of marine species, such as whales and sea turtles. One type of animal is however usually free of barnacles: the sharks. Unlike the smooth-skinned whales, sharks tend to have rough and uneven skin, and this might prove to be the salutation for ships as well.

The new hull coating created by Dr. Kirill Efimenko, research assistant professor in the Department of Chemical and Biomolecular Engineering, and Dr. Jan Genzer, professor in the same department, contains nests of different-sized “wrinkles” which makes the surface rough and uneven, just like the skin of a shark.

The wrinkly material was tested in Wilmington, N.C and remained free of barnacles after 18 months of exposure to seawater. Flat coatings made of the same material were on the other hand colonized by barnacles within a month.

“The results are very promising,” says Efimenko. “We

are dealing with a very complex phenomenon. Living

organisms are very adaptable to the environment, so

we need to find their weakness. And this hierarchical

wrinkled topography seems to do the trick.”

Efimenko and Genzer created the wrinkles by stretching a rubber sheet, exposing it to ultra-violet ozone, and then relieving the tension, causing five generations of “wrinkles” to form concurrently. After that, the coating was covered in an ultra-thin layer of semifluorinated material.

As reported earlier here and here, the retired 523-foot military vessel “Gen. Hoyt S. Vandenberg” was scheduled to be sunk this month to become an artificial reef off the Floridian coast, and we can now happily report that everything has gone according to plan.

After being slightly delayed last minute by a sea turtle venturing into the sinking zone, Vandenberg was successfully put to rest roughly 7 miles south-southeast of Key West at 10:24 a.m., May 27.

Once 44 carefully positioned explosive charges had been detonated, Vandenberg gracefully slipped below the water’s surface in no more than 1 minute and 54 seconds. It is now resting rightside-up on the sea bottom at a depth of roughly 140 feet (43 metres) in the Florida Keys National Marine Sanctuary.

Divers and other underwater specialists are currently surveying the ship to make sure it is safe for the public to explore. Hopefully, Vandenberg will open up for public diving by Friday morning.

Over 20 cameras were mounted on the vessel to capture images of it descending into the blue, cameras that are now being retrieved by an underwater team.

Vandenberg is the second largest vessel ever intentionally sunk to become an artificial reef. In 2006, the 888-foot long USS Oriskany, also known as CV-34, was sunk in the Gulf of Mexico, south of Pensacola, Florida.

Eleven of the 18 freshwater stingrays living at the U.S. National Zoo died over the holiday weekened, together with two arowanas. All dead fishes were residents of the zoo’s Amazonia exhibit; a 55,000-gallon (208,000 L) aquarium designed to replicate a flooded Amazon forest. Zoo officials are now suspecting low oxygen levels to be behind the sudden mass death.

Picture of Motoro Sting Ray, Ocellate river stingray – Potamotrygon motoro. Not one of the dead rays.
Copyright www.jjphoto.dk

As soon as the deaths were discovered 7 a.m Monday morning, zookeepers tested the water and found low levels of dissolved oxygen. They immediately started supplementing the aquarium with reservoir water and no more fish have died so far. In addition to stingrays and arrowanas, the Amazon aquarium is also home to discus, boulengerella fish, and a large school of guppies. By 10:15 a.m. Monday, the oxygen levels were back to normal but zookeepers continue to monitor the health of the surviving fish just in case.

Necropsies performed on the dead fish did not unveil any definite cause of death, which makes low oxygen levels even more likely, according to National Zoo officials. They do not believe human error caused the oxygen drop, since all protocols and checks were properly followed Sunday night.

Insufficient levels of dissolved oxygen in the water are one of the most common causes of fish mass death, in the wild as well as in captivity. Last year, 41 stingrays died at the Calgary Zoo in Canada due oxygen scarcity in the water.

A group of conservationists and scientists are planning a research trip to the world’s largest rubbish pile; the Great Pacific Garbage Patch. Also known as the Eastern Garbage Patch, the Pacific Trash Vortex, or simply the Great Plastic Vortex; this gyre of marine litter has been gradually building over the last 60 years but we still know very little of this man-made monstrosity.

The expedition, headed by Hong Kong based entrepreneur and conservationist Doug Woodring, hopes to learn more about the nature of the vortex and investigate if it is possible to fish out the debris without causing even more harm.

“It will take many years to understand and fix the problem,” says Jim Dufour, a senior engineer at Scripps Institution of Oceanography in California, who is advising the trip.

According to Dufour, research expeditions like this one are of imperative importance since establishing the extent of the problem is vital for the future health of the oceans.

“It [the expedition] will be the first scientific endeavour studying sea surface pollutants, impact to organisms at intermediate depths, bottom sediments, and the impacts to organisms caused by the leaching of chemical constituents in discarded plastic,” he says.

The research crew, which will pass through the gyre twice on their 50-day journey from San Francisco to Hawaii and back, are using a 150-foot-tall (45-metre-tall) ship – the Kaisei, which is Japanese for Ocean Planet. They will also be accompanied by a fishing trawler responsible for testing various methods of catching the garbage without causing too much harm to marine life.

“You have to have netting that is small enough to catch a lot but big enough to let plankton go through it,” Woodring explains.

Last year, building contractor and scuba dive instructor Richard Owen formed the Environmental Cleanup Coalition (ECC) to address the issue of the pollution of the North Pacific. A plan designed by the coalition suggests modifying a fleet of ships to clear the area of debris and form a restoration and recycling laboratory called Gyre Island.

Hopefully, the garbage can not only be fished up but also recycled or used to create fuel, but a long term solution must naturally involve preventing the garbage from ending up there in the first place.

”The real fix is back on land. We need to provide the means, globally, to care for our disposable waste,” says Dufour.

Despite being sponsored by the water company Brita and backed by the United Nations Environment Programme, the expedition is still looking for more funding to meet its two million US dollar budget. Since the enormous trash pile is located in international waters, no single government feels responsible for cleaning it up or funding research. Another problem is lack of awareness; since very few people ever even come close to this remote part of the ocean it is difficult to make the problem a high priority issue. A documentary will be filmed during the expedition in hope of making the public more aware of where the world’s largest garbage dump is actually located.

What is the Eastern Garbage Patch?

According to data from the United Nations Environment Programme, our oceans contain roughly 13,000 pieces of plastic litter per square kilometre of sea. However, this trash is not evenly spread throughout the marine environment – spiralling ocean currents located in five different parts of the world are continuously sucking in vast amounts of litter and trapping it there. Of these five different gyres, the most littered one is located in the North Pacific – the Eastern Garbage Patch.

The five major oceanic gyres.

The existence of the Eastern Garbage Patch was first predicted in a 1988 paper published by the National Oceanic and Atmospheric Administration (NOAA) of the United States. NOAA based their prediction on data obtained from Alaskan research carried out in the mid 1980s; research which unveiled high concentrations of marine debris accumulating in regions governed by particular patterns of ocean currents. Using information from the Sea of Japan, the researchers postulated that trash accumulations would occur in other similar parts of the Pacific Ocean where prevailing currents were favourable to the formation of comparatively stable bodies of water. They specifically indicated the North Pacific Gyre.

California-based sea captain and ocean researcher Charles Moore confirmed the existence of a garbage patch in the North Pacific after returning home through the North Pacific Gyre after competing in the Transpac sailing race. Moore contacted oceanographer Curtis Ebbesmeyer who dubbed the region “the Eastern Garbage Patch” (EGP).

Twice the size of Texas

The Eastern Garbage Patch is located roughly 135° to 155°W and 35° to 42°N between Hawaii and mainland USA and is estimated to have grown to twice the size of Texas, even though no one knows for sure exactly how large the littered area really is. The garbage patch consists mainly of suspended plastic products that, after spending a long time in the ocean being broken down by the sun’s rays, have disintegrated into fragments so miniscule that most of the patch cannot be detected using satellite imaging.

Impact on wild-life and humans

The plastic soup resembles a congregation of zooplankton and is therefore devoured by animals that feed on zooplankton, such as jellyfish. The plastics will then commence their journey through the food chain until they end up in the stomachs of larger animals, such as sea turtles and marine birds. When ingested, plastic fragments can choke the unfortunate animal or block its digestive tract.

Plastics are not only dangerous in themselves, they are also known to absorb pollutants from the water, including DDT, PCB and PAHs, which can lead to acute poisoning or disrupt the hormonal system of animals that ingest them. This is naturally bad news for anyone who likes to eat marine fish and other types of sea food.

The Top 10 list of new species from 2008 has now been compiled by the ASU institute and an international committee of taxonomists. Last year, thousands of new species were described by science, many of them native to hard-to-access regions of our planet, such as remote tropical areas or deep sea habitats, but two of the species on the list actually hail from much less exotic locations: Cardiff and a bottle of hairspray.

“Most people do not realize just how incomplete our knowledge of Earth’s species is,” said Quentin Wheeler, director of the International Institute for Species Exploration at Arizona State University, which announced the top 10 new species list. “We are surrounded by such an exuberance of species diversity that we too often take it for granted“.

These are the selected few that made it all the way to the ASU Top 10:

1.) A palm with no close relatives in the neighbourhood

Name: Tahina spectabilis
Common Name: Tahina Palm

This plant produces truly spectacular inflorescence with numerous flowers. After fruiting, the palm dies and collapses. Strangely enough, the genus Tahina is not closely related to any of the other 170+ palm species found on Madagascar. Its closest relatives are instead found in Afghanistan, Thailand, Vietnam and China.

Soon after the publication of the species, seeds were disseminated throughout the palm grower community, raising money for its conservation by the local villagers.

2.) The world’s longest known living insect

Name: Phobaeticus chani
Common Name: This insect has no common name in English. Perhaps Chani’s stick insect would be a suitable English common name? Do any of the readers of this blog know if this species has a common name in Malaysia?

With a body length of 35.6 cm (14 inches) and an overall length of 56.7 cm (22.3 inches), Phobaeticus chani is the world’s longest known now living insect. Once upon a time, insects grew much larger than this, but none of those gigantic insects have survived into our time.

3.) The world’s smallest seahorse

Name: Hippocampus satomiae
Common Name: Satomi’s Pygmy Seahorse

This is the smallest known seahorse in the world. It has a standard length of no more than 13.8mm (0.54 inches) and an approximate height of 11.5mm (0.45 inches).

4.) The world’s smallest snake

Name: Leptotyphlops carlae
Common Name: Barbados Threadsnake

This is the world’s smallest snake with a total length of 104 mm (4.1 inches).

5.) A Welsh ghost slug

Name: Selenochlamys ysbryda
Common Name: Ghost Slug

The word ysbryda is a Latinized version of the Welsh word ysbryd which means ghost or spirit. The name alludes to the species’ ghostly appearance, nocturnal, predatory behaviour and the element of mystery surrounding its origin. Strangely enough, this new species was discovered in Cardiff, UK, a well-collected and densely populated part of the world. (For all the Torchwood fans out there, this mesmerizing find naturally comes as no surprise.)

6.) A snail with a surprising twist

Name: Opisthostoma vermiculum
Common Name: This species has no common name in English. Do any of the readers of this blog know it has a common name in Malaysia?

Most gastropod shells tightly coil according to a logarithmic spiral and have an upper limit of three coiling axes, but the shell of Opisthostoma vermiculum consists of four different coiling axes which is the highest number ever seen in gastropods. As if this wasn’t enough, the shell whorls detach three times and reattach twice to preceding whorls in a fairly consistent manner, which suggests that the coiling strategy is under some form of strict developmental-gene control.

7.) Deep-blue deep-dweller

Name: Chromis abyssus
Common Name: Deep Blue Chromis

Compared to other members of its genus, the deep blue Chromis abyssus lives pretty far from the surface but it is certainly not found at abyssal depths. The name is instead a reference to the BBC documentary Pacific Abyss, since the type specimen was collected during the making of this show. This species was also the first one to have its description registered in the newly launched taxonomic database Zoobank.

8.) A 380 million year old delivery

Name: Materpiscis attenboroughi
Common Name: Mother Fish

This is the oldest known live bearing (viviparous) vertebrate and we know of it from fossil record only. Amazingly, the fossil shows a female fish in the process of giving birth some 380 million years ago. It was found at Gogo Station in Western Australia. The name of the genus, Materpiscis, means “mother fish” in Latin, while the species itself is named in honour of Sir David Attenborough who first drew attention to the Gogo fish sites in his 1979 series Life on Earth.

9.) African decaf

Name: Coffea charrieriana
Common Name: Charrier Coffee

This is a true member of the genus Coffea, but it is completely void of caffeine. Coffea charrieriana is the first known caffeine-free Coffea species from Central Africa and coffee makers are now pondering the idea of using it to make natural decaf coffee.

10.) Hair spray bacteria

Name: Microbacterium hatanonis
Common Name: None

This new species wasn’t found in some remote rainforest or deep down in blue; it was isolated as contaminant of hairspray.

The Top 10 New Species were selected from the thousands of species fully described and published in 2008. The public could nominate species through the IISE Web site and nominations were also generated by IISE staff and committee members themselves. The Committee had complete freedom in making its choices and developing its own criteria to provide a breadth of species attributes and importance.

I am sorry that we don’t have pictures of all species. To see pictures of all species you can here.

If you would like to nominate a species for the 2010 Top 10 New Species please click here.

Around 55 percent of coral reefs in South Sulawesi waters have been damaged by destructive fishing practices, the South Sulawesi marine and fishery service announced on Wednesday. Due to the destructive practise of throwing explosives into the water to catch fish, only 45 percent of the coral reefs in the national marine park of Takabonerate are in good condition.

The Indonesian Naval personal have arrested fishermen in South Sulawesi for using explosives to catch fish, but the practise continues.

Takabonerate is considered the world`s third most beautiful marine park and has received an award from the World Ocean Conference (WOC) which was held in Manado, North Sulawesi, this month. This marine park is located within the famous Coral Triangle; a Pacific region home to over 75 percent of the world’s known coral species. This figure becomes even more remarkable if you take into account that the triangle only comprises two percent of the world’s ocean.

Hopefully, the situation in the region will improve as six heads of state/government participating in the Coral Triangle Initiative (CTI) Summit organized as part of the WOC signed a declaration on May 15, approving the Coral Triangle Initiative Program. Within this program, the six countries who share this amazingly coral rich region will coordinate their protection of marine resources.

Over 120 million people depend on the Coral Triangle ecosystem for their survival and would suffer greatly if the diversity of fish, shellfish and other marine creatures were to become depleted due to unsustainable fishing practises.

The first-ever comprehensive global report on the state of shellfish has been released by The Nature Conservancy at the International Marine Conservation Congress in Washington, DC.

This one of its kind report is a collaborative work carried out by scientists from five different continents employed by academic and research institutions as well as by conservation organizations.

The report, which focuses primarily on the distribution and condition of native oyster reefs, show that 85 percent of oyster reefs have been completely destroyed worldwide and that this type of environment is the most severely impacted of all marine habitats.

In a majority of individual bays around the globe, the loss exceeds 90 percent and in some areas the loss of oyster reef habitat is over 99 percent. The situation is especially dire in Europe, North America and Australia where oyster reefs are functionally extinct in many areas.

“We’re seeing an unprecedented and alarming

decline in the condition of oyster reefs, a critically

important habitat in the world’s bays and estuaries,”

says Mike Beck, senior marine scientist at The Nature

Conservancy and lead author of the report.

Many of us see oysters as a culinary delight only, but oyster reefs provide us humans with a long row of valuable favours that we rarely think about. Did you for instance known that oyster reefs function as buffers that protect shorelines and prevent coastal marshes from disappearing, which in turn guard people from the consequences of hurricanes and other severe storm surges? Being filter feeders, oysters also help keep the water quality up in the ocean and they also provide food and habitat for many different types of birds, fish and shellfish.

Even though the situation is dismal, there is still time to save the remaining populations and aid the recuperation of damaged oyster reefs. In the United States, millions of young Olympia oysters have been reintroduced to the mudflats surrounding Netarts Bay in Oregon, in an effort to re-create a self-sustaining population of this native species. The project is a joint effort by government and university scientists, conservation groups, industry representatives, and local volunteers.

“With support from the local community and other partners, we’re demonstrating that shellfish restoration really works”, says Dick Vander Schaaf, Oregon director of coast and marine conservation for the Conservancy. “Expanding the effort to other bays and estuaries will help to ensure that the ecological benefits of oyster reefs are there for future generations.”

If wish to learn more about the global oyster reef situation, you can find the report here.

According to the treasure hunting company Odyssey Marine Exploration, fishing trawlers are destroying wrecks by snagging them with nets and cables, dragging objects and gradually tearing the ships apart.

An example of the damage trawlers can cause is the wreck of HMS Victory, a British warship sunk in the English Channel in 1744. Trawling nets and cables have become entangled around cannon and ballast blocks, and three of the ship’s bronze cannons have been displaced. One of them, a 42-pound (19 kg) cannon weighing 4 tonnes, has been dragged 55 metres (180 feet) and flipped upside down. Two other cannon recovered by Odyssey Marine Exploration last year show fresh scratches from trawls and damage caused by friction from nets or cables.

“We know trawlers work the Victory site because one almost ran us down while we were there,” says Tom Dettweiler, senior project manager of Odyssey Marine Exploration.

“It turns out that Victory is right in the middle of the heaviest trawling area in the Western Channel,” says Greg Stemm, chief executive of the company. “We were shocked and surprised by the degree of damage we found in the Channel, he continues. “When we got into this business, like everyone else we thought that beyond 50 or 60 metres, below the reach of divers, we’d find pristine shipwrecks. We thought we’d be finding rainforest, but instead found an industrial site criss-crossed by bulldozers and trucks.”

While surveying 4,725 sq miles (12,300 sq km) of the western Channel, Odyssey Marine Exploration found 267 wrecks, of which 112 showed evidence of being damaged by bottom trawlers. That is over 40 percent.

The English Channel has been a busy area for at least three and half millennia and was thought to be littered with wrecks. In these fairly cold waters, wooden ships tend to stay intact for much longer periods of time than they would in warm tropical regions. Strangely enough, Odyssey Marine Exploration found no more than three pre-1800 wrecks when surveying the area using modern technology sensitive enough to disclose a single amphora. According to historic estimations, at least 1,500 ships have been lost in these waters so finding no more than three pre-1800 wrecks calls for further investigation.

Odyssey Marine Exploration blames bottom trawlers for the lack of wrecks. “The conclusion and fear is that the vast majority of pre-1800 sites have already been completely obliterated by the deep-sea fishing industry,” says Sean Kingsley, of Wreck Watch International, the author of the Odyssey report.

Odyssey Marine Exploration is the world’s only publicly-listed shipwreck exploration company and critics argue that these American treasure hunters are overstating the damage for their own gain.

“You have to ask why Odyssey is doing such a study,” said Robert Yorke, chairman of the Joint Nautical Archaeology Policy Committee. “They want to pressurise the UK Government to allow them to get at the wreck . . . the Victory hasn’t disappeared since 1744; it’s not going to disappear tomorrow.”

The Ministry of Defence has jurisdiction over warships’ remains and it has asked English Heritage for an assessment of the threats to the site. English Heritage has a policy of leaving shipwrecks untouched on the seabed unless a definite risk can be shown.

Researchers at Woods Hole Oceanographic Institution (WHOI) unveiled a hazardous cocktail of pesticides when analysing the brain matter of 12 marine mammals; eleven cetaceans and one gray seal stranded near Cape Cod, Massachusetts.

This is the most extensive study of pollutants in marine mammals’ brains and it confirms suspicions of marine mammals being the carrier of a vast array of different chemicals that have found their way into marine ecosystems.

Lead author Eric Montie analyzed the cerebrospinal fluid and the gray matter of the cerebellum in the twelve animals and found them to contain a long row of different man-made chemicals, including a group of especially widespread substances labelled “the dirty dozen” by environmentalists. Many countries banned the “the dirty dozen” as early as the 1970s due to their adverse effect on human health, but they are unfortunately still present in our environment.

Montie didn’t just test for the presence of certain chemicals; he also measured their concentration and found one instance where it was surprisingly high.

“The biggest wakeup was that we found parts per million concentrations of hydroxylated PCBs in the cerebrospinal fluid of a gray seal”, says Montie. “That is so worrisome for me. You rarely find parts per million levels of anything in the brain.”

PCBs are neurotoxicants known to disrupt the thyroid hormone system. Other examples chemicals found in the tested mammals are DDT (diklorodifenyltriklorethane), which can cause cancer and disturb reproduction, and PBDEs (polybrominated diphenyl ethers); a type of flame retardants known to impair the development of motor activity and cognition.

Co-author Chris Reddy, a senior scientist in the WHOI Marine Chemistry and Geochemistry Department, describes the new study as “groundbreaking because Eric measures a variety of different chemicals in animal tissues that had not been previously explored. It gives us greater insight into how these chemicals may behave in marine mammals.”

The results of this study was published online April 17 in Environmental Pollution.

As reported earlier this week, Danish television presenter Lisbeth Koelster was put on trial after deliberately pouring diluted anti-dandruff shampoo into a fish tank housing 12 guppies. The aim of the “experiment” was to demonstrate the level of toxic material in the shampoo. After being subjected to the shampoo, all but one of the fishes died and a Danish veterinarian who watched the show decided to press charges.

Koelster had pleaded not guilty, but the Glostrup court found her guilty of violating animal protection laws. Judge Thomas Lohse said Koelster had “deliberately committed an act of cruelty to animals” and violated animal protection laws. She was however not found to have violated any laws regarding experimentation on animals.

Koelster will not have to pay any fine since the event took place in 2004; four and a half year from now. The judge found this amount of time unreasonable and therefore decided not to fine her.