In an effort to curb the population of invasive Atlantic sea lampreys (Petromyzon marinus) in the North American Great Lakes, researchers are now testing a “love trap” in northern Michigan.

The traps will be scented with an odour produced by male lampreys during mating and researchers hope that this smelly love potion will lure female lampreys into the traps.

“We are trying to fool them into a fatal love,” said researcher Nick Johnson who will spend the next three years evaluating the effectiveness of the method.

The traps will be placed in ten streams around the Great Lakes, since lampreys swim into streams when it’s time to mate. After spawning, they die.

The Atlantic sea lamprey is native to the Atlantic Ocean but has been able to migrate into the Great Lakes through man-made shipping canals. The first specimens where seen in the region as early as the 1830s. By the 1950s, lampreys had decimated native populations of lake trout and white fish by rasping through their skin and sucking out their blood and bodily fluids. Several other populations of large and commercially important food fish had also been severely damaged by the new resident.

Since 1955, Fisheries and Oceans Canada and the U.S. Fish and Wildlife Service have worked closely on the Great Lakes Fishery Commission to control the Atlantic sea lampreys, using lampricides (substances toxic to lamprey larvae), migration barriers, and sterilization of male lampreys. Hopefully, the new pheromone scented traps will prove an efficient addition to their arsenal.

American fishing captain Linda Greenlaw, best known for her depiction in the book “The Perfect Storm” and the film on which it was based, has been convicted of illegally entering and fishing in Canadian waters.

Greenlaw and her boat the Sea Hawk was spotted by a Canadian fisheries patrol plane last September, with fishing lines running five miles (roughly eight kilometres) into Canadian waters.

According to Greenlaw, she had mistakenly entered Canadian waters without realising it while searching for swordfish.

“This line, which is drawn on a piece of paper, you can’t see it when you’re fishing and working on deck,” Greenlaw said outside the provincial court of St. John’s. “There’s no fence. There’s no blinking lights.”

Judge Joe Woodrow said he believed that Greenlaw had made an honest mistake, but that it was a mistake a reasonable skipper would not have made, because she should have checked her GPS equipment. Greenlaw was therefore convicted on counts of illegally entering Canadian waters and illegally fishing there.

The Crown wants Greenlaw to be fined $50,000, while her lawyer is recommending half of that amount.

Greenlaw provided key information about a fatal 1991 storm in the Atlantic for the book “The Perfect Storm” by journalist Sebastian Junger. When the book was turned into a movie starring George Cloney and Mark Wahlberg, Greenlaw was portrayed by actor Mary Elizabeth Mastrantonio.

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.

As reported earlier , the European Union has decided to ban the import of seal skin and other seal products hailing from commercial seal hunting.

This has upset Canadian seal hunters since Italy and Denmark, both members of the European Union, are two major importers of seal products. Italy imports most of their seal skins from Russia, but Denmark has always been an important trade partner for North American seal hunters, partly due to Denmark’s traditional connection to Greenland.

According to a statement from Canadian Trade Minister Stockwell Day, the federal government is now getting ready to move in with an appeal against the ban, which they see as a clear breach of WTO regulation.

“We’ll go to the WTO because it’s clear in WTO regulations that if one country wants to ban the products of another, it has to have clear scientific, medically acceptable reasons for doing so, and this EU ban is not based on hard science,” Day said.

The Canadin government believes that Canada deserves an exemption from the import ban since it follows internationally accepted guidelines regarding seal hunting, e.g. by prohibiting the clubbing of baby seals while they still have their white coats.

Day claims that the European ban is based on “people’s feelings” rather than hard facts, and says that the trade action will proceed unless the European Union Parliament exempts Canada and other countries that he said practise humane and sustainable seal hunting. According to Day, seal hunt proponents erroneously portray seal hunting as it was 40 years ago.

The suggested seal import ban must still be approved by individual European governments before becoming law but can, if passed, come into effect as early as next year. If the is approved, it will cause an annual 2 million USD loss for the Canadian industry.

Canadian Fisheries Minister Gail Shea agrees supports the government’s planned trade action.

“When you live in small coastal communities, sometimes there’s not many opportunities to make some additional money,” she said. “We have a number of families who make up to 35% of their annual income from the seal hunt. So yes, I do think it’s very important.”

As reported earlier, the proposed European seal import ban will contain some exemptions and seal products resulting from hunts traditionally conducted by Inuit and other indigenous communities can still be imported to and marketed in European Union countries even if the ban is approved. Products that result from hunting conducted for the purpose of sustainable management of marine resources on a non-profit basis will also be allowed, and individual travellers will be permitted to bring seal products to the European Union as long as the import is of an occasional nature and consists exclusively of goods for the personal use of the traveller.

U.S. and Canadian scientists have documented the first known migration of blue whales from the coast of California to areas off British Columbia and the Gulf of Alaska since the 1965 ban of commercial whaling.

Researchers identified 15 separate cases where Blue Whales were spotted in the waters off British Columbia and the Gulf of Alaska. Four of the observed animals were identified as Blue Whales previously seen swimming in Californian waters, which suggests that Blue Whales are re-establishing their old migration pattern.

The identifications were made by comparing pictures of Blue Whales photographed in the northern parts of the Pacific Ocean since 1997 with photographs of Blue Whales taken off the southern U.S. West Coast. The identity of individual Blue Whales was determined based on dorsal fin shape and pigmentation patterns in skin colour.

The Blue Whale was almost hunted to extinction during the 20^th century and even though commercial whaling has been prohibited (albeit not strictly enforced) since 1965 the populations are having a hard time recovering. Blue Whales are still listed as endangered on the IUCN Red List of Threatened Species and no more than roughly 5,000 to 12,000 Blue Whales are believed to remain in our oceans, with 2,000 of them living of the U.S. West Coast.

The migration research was conducted by scientists from Cascadia Research Collective in Washington State, NOAA’s* Southwest Fisheries Science Center in California, and Canada’s Department of Fisheries and Oceans. You can read the full article in the most recent issue of the journal Marine Mammal Science.

* The United States National Oceanic and Atmospheric Administration (NOAA)

Yesterday, the European Parliament voted to ban most seal products from the European market. The legislative resolution was adopted with 550 votes in favour, 49 against and 41 abstentions.

Suggestions from the European Parliament’s will only become law if adopted by the European Council of Ministers, which represents the member states. The legislative report on the seal products ban was agreed with the European Council of Ministers in first-reading.

An exemption is allowed for indigenous communities so seal products resulting from hunts traditionally conducted by Inuit and other indigenous communities can still be imported to and marketed in European Union countries.

“This deal will protect seals from cruelty and protect the Inuit people’s traditional way of life,” said Christel Schaldemose, a Danish Socialist MEP.

Import of seal products will also be permitted where it is of an occasional nature and consists exclusively of goods for the personal use of the traveller or products that result from by-products of hunting conducted for the purpose of sustainable management of marine resources on a non-profit basis.

The legislative report was drafted by UK MEP Diana Wallis of the Alliance for Liberals and Democrats in Europe (ALDE). ALDE is the third largest political group in the European Parliament.

No ban on hunting

“Seals are very beautiful marine animals, in fact, I have realized during this process that they have great PR, but to some they are the rats of the sea”, Wallis said in the debate yesterday.

“That is how they are perceived by many fishermen – an adult seal gets through an enormous amount of fish on a daily basis. Therefore, there will remain the need for seals to be hunted to ensure the sustainability of fisheries in some area.“

“But what we have not done here is to regulate hunting,” said Wallis. “If people in any of our

member states wish to hunt, they can still continue to hunt. What they cannot do is take commercial gain from the results of that hunt. But it should be the case that the results of the hunt can be used, and I hope particularly that those parts of seals that can be used by the medical community will be able to be used.”

Today, human heart valves can be replaced with bioprosthetic valves from seals and other marine mammals.

“Great progress has been made in the survival and quality of life of cardiac patients by using the aortic, pulmonary and pericardial tissue of harp seals, the assumption being that they are sustainably hunted or killed and not in a cruel way,” said Irish MEP Avril Doyle of the Group of the European People’s Party (Christian Democrats) and European Democrats, EPP-ED. “I would like assurances on ongoing medical research and bioprosthetic use of products from seals in the context of the compromise,” she added.

The patent holder for the valve replacement process, Efstathios Andreas Agathos of Massachusetts, says the needed seal valves can be supplied by “the annual seal harvesting supported by Canadian government for population control.”

Canada will challenge ban at WTO

Canada‘s Trade Minister Stockwell Day said that Canada will challenge the trade ban at the World Trade Organization, unless an exemption is added for any country that has strict guidelines in place for humane and sustainable sealing practices.

“The decision by the European Parliament lacks any basis in facts,” said Canadian Fisheries and Oceans Minister Gail Shea. “The Canadian seal hunt is guided by rigorous animal welfare principles which are internationally recognized by independent observers. I once again caution my European counterparts about the dangers of pursuing politically motivated bans on other countries’ traditional industries. Our government will stand up for the jobs and communities that depend on the seal hunt.”

The world’s largest seal hunt is conducted every spring off Canada’s Atlantic coast and Denmark, one of the main importers of raw fur sealskins to the European Union, imports seal skins directly from Canada and Greenland. Denmark and Italy are by far the two largest importers of raw fur sealskins for the EU market. Unlike Denmark, Italy imports most skins from Russia, and from the two EU members Finland and Scotland (UK). Greece will also be affected by the trade ban, but not to the same extent as Denmark and Italy since the Greece trade in raw seal skins – predominately from Finland and Scotland – is much smaller.

According to WWF Canada, excessive bycatch* of cod is undermining the cod moratorium imposed in 1994. On the southern Grand Banks near Canada, cod bycatch is now at least 70 percent higher than target levels and this is hampering the recovery of one the world’s best known fisheries.

WWF Canada also states that ships from the European Union are responsible for the largest proportion of the overrun bycatch.

In 2003, bycatch amounts were estimated to be over 80 per cent of the remaining cod stock which caused WWF to push for a 2008 cod recovery strategy that included setting a bycatch reduction target of 40 per cent for the southern Grand Banks at the September 2007 annual meeting of the Northwest Atlantic Fisheries Organization (NAFO).

The 40 percent target level was based on estimations of how much the cod population could endure and still have at least some chance of recovery. 40 percent is equivalent of 420 tonnes of cod, but unofficial fishing statistics for the year 2008 show that almost twice as much, 713 tonnes, was caught as bycatch last year. Of these 713 tonnes, ships from the European Union member states accounted for 444 tonnes.

It should be noted that these figures does not account for misreported bycatch and illegal fishing.

WWF Canada is now urging NAFO to adopt an effective recovery plan for southern Grand Banks cod; one hat will include immediate bycatch reduction targets as well as long-term recovery goals. Gear-based solutions need to be combined with protection of spawning and nursery areas for the plan to be effective and the arrangements must naturally be backed by efficient monitoring and enforcement to have any effect. Such a recovery plan would be consistent with the Ecosystem management approach adopted in the newly revised NAFO Convention.

“Cod and other fish stocks can never recover as long as NAFO refuses to see the urgency of the bycatch problem and acknowledge that voluntary measures are not working,” says Dr. Robert Rangeley, Vice President Atlantic, WWF-Canada. “If NAFO’s Scientific Council starts working on solutions at their June meeting then it will be the responsibility of the Fisheries Commission, in September, to impose strict management measures that will give cod recovery a chance.”

* Bycatch is here defined as unused and unmanaged catch. You can find more information about bycatch in “Defining and Estimating Global Marine Fisheries Bycatch”; a paper co-authored by WWF for the journal Marine Policy. According to this paper, the global bycatch now constitutes over 40 percent of the global reported catch.

Modern seals, walruses, and sea lions are all descendants of animals that once lived on land but eventually swapped their terrestrial lifestyle for a life in the ocean. Until now, the morphological evidence for this transition from land to water has been weak, but researchers from Canada and the United States have now found a remarkably well preserved skeleton of a newly discovered carnivorous animal: Puijila darwini.

Skeletal illustration of Puijila darwini.
Credit: Mark A. Klingler/Carnegie Museum of Natural History

Seals, walruses and sea lions all have flippers; a type of limb perfectly adapted for swimming and moving around in water. But how could a land living animal develop flippers? The adaptation evolved gradually over a long period of time, as some land living animals adapted semi-aquatic habits. New research now suggests that the genus Puijila is the “missing” evolutionary link between our modern seals, walruses and sea lions and their terrestrial ancestors.

Puijila darwini is described as having fore-limbs comparatively proportionate to modern carnivorous land animals rather than to pinnepeds*, a long tail, and webbed feet.

“The remarkably preserved skeleton of Puijila had heavy limbs, indicative of well developed muscles, and flattened phalanges which suggests that the feet were webbed, but not flippers. This animal was likely adept at both swimming and walking on land. For swimming it paddled with both front and hind limbs. Puijila is the evolutionary evidence we have been lacking for so long,” says Mary Dawson, curator emeritus of Carnegie Museum of Natural History.

The Puijila darwini skeleton was found in Nunavut, Canada in the remains of what was once a crater lake on coastal Devon Island. The first pieces of the skeleton were found in 2007, but the important basicranium wasn’t found until researchers paid a new visit to the site in 2008. Without a basicranium it is much more difficult to determine taxonomic relationships.

Based on Paleobotanic fossils, Devon Island had a cool, coastal temperate climate during the Miocene when Puijila darwini roamed the seashore. The conditions were quite similar to modern-day New Jersey and the lakes would freeze during the winter, something which probably prompted Puijila darwini to move over land from the lake to the sea in search of food.

“The find suggests that pinnipeds went through a freshwater phase in their evolution. It also provides us with a glimpse of what pinnipeds looked like before they had flippers,” says Natalia Rybczynski, leader of the field expedition.

The idea that semi-aquatic mammals may have undergone a transition from freshwater to saltwater is not new. In the On the Origin of Species by the Means of Natural Selection, Charles Darwin writes “A strictly terrestrial animal, by occasionally hunting for food in shallow water, then in streams or lakes, might at last be converted in an animal so thoroughly aquatic as to brace the open ocean.”

The oldest well-preserved pinniped animal belongs to the genus Enaliarctos and was a sea living creature with flippers. This species has been found on North Americas northern Pacific shores which have lead researchers to believe that the evolution of pinniped animals may have taken place mainly around the Arctic. This new finding of Puijila darwini strengthens that notion.

You can find more information about Puijila darwini and the origin of pinnipeds in the April 23 issue of the journal Nature.

http://www.nature.com

http://www.nature.com/nature/index.html

* The pinnipeds are a widely distributed and diverse group of semi-aquatic marine mammals. It contains the families Odobenidae (walruses), Otariidae (eared seals, including sea lions and fur seals), and Phocidae (earless seals). The name is derived from the Latin words pinna, which means wing or fin, and ped, which means foot. The pinnipeds are therefore also known as fin-footed mammals.

This Thursday, the Anchorage-based North Pacific Fishery Management Council[1] approved an unprecedented plan to ban commercial fishing in the Arctic Ocean, as a part of their Arctic Fishery Management Plan. The council voted 11-0 in favour of the plan, which essentially bans all commercial fishing from the Canadian border down to the Bering Strait, and it is now up to the U.S. Commerce secretary to approve or reject the ban.

Before approving the ban, the North Pacific Fishery Management Council spent two years developing an Arctic Fishery Management Plan in response to global warming and the retreat of sea ice along Alaska’s northern coast. As of today, fishing is not carried out on any major scale in the Arctic Ocean, but commercially interesting species like crab and pollock may expand in this part of the sea and this could make the area attractive for fishing fleets. The council therefore decided to develop a plan in advance to be prepared for any future developments.

Environmentalists and fishing industry groups alike have praised the Arctic Plan, since both parties recognize the need to enforce strong management control over the Arctic Ocean. We still know very little about life in this remote part of the world and the few fish stock surveys that has been carried out in these waters has not managed to find any larger fish populations. The area could be opened up for regulated commercial fishing in the future, if more thorough research of the Arctic Ocean would show that sustainable fishing could be carried out without injuring the ecosystem.

“Climate change is having a significant effect on the Arctic, opening previously ice-covered waters and drawing cold-water species farther north,” says Dave Benton of the Alaskan Marine Conservation Alliance[2]. “The council’s action to close these waters as a precautionary measure gives us the opportunity to conduct the scientific review necessary to develop a plan for how sustainable fisheries might be conducted in the Arctic in the future.“

Lobsters caught in the Northumberland Strait in eastern Canada are normally black, so it is easy to imagine the surprise fisherman Danny Knockwood of the Elsipogtog First Nation must have felt when he suddenly found himself face to face with a yellow and white specimen. Knockwood made the unusual catch while pulling his traps out of the sea near Richibucto Village, where the Richibucto Rivers empties into the northern Atlantic.

The Canadian fishermen named his new pet Autumn and made a short video of the animal for YouTube. As of October 8, the video had managed to attract several hundred viewers – some of them suggesting that Knockwood should eat his rare find.

Knockwood has however decided to keep Autumn away from the boiling water and has instead managed to find her a new home at the Aquarium and Marine Centre in Shippagan, a museum where marine animals are housed in real seawater. The marine centre is already home to a substantial collection of oddly coloured lobsters, so Autumn will fit right in.

“In captivity, the lobster could live for many years,” says Curator Aurele Godin of the Shippagan Aquarium and Marine Centre. “And I’ve got many other coloured ones — blue ones, yellow ones, orange and blacks. Every year fishermen come up with them. They call me and I go pick them up.”

Instead of showing dark spots on a dark green base colour like normal lobsters, Autumn sports a vivid yellow colour on top while her underside is almost white. According to a specialist from the Department of Fisheries and Oceans who examined the video and photos of Autumn, genetic defects can cause the shell of a lobster to develop strange and unusual colours. The specialist also confirmed that Autumn is a female lobster and estimated her to be roughly 10 years of age.

Until Autumn is transported to the museum, she will be residing in a an underwater cage near Knockwood’s home.

The below story is unrelated to the first one but is still worth a look as it shows how big lobster can grow: