The rare Gangetic dolphin (Platanista gangetica) has been declared National Aquatic Animal of India. A few days after the formal declaration, which took place at a National Ganga River Basic Authority meeting in New Delhi earlier this week, Bihar chief minister Nitish Kumar announced that he has directed state authorities to put a halt to dolphin hunting in the Ganga.

“A close watch is being kept on the ghats of river Ganga by the magistrates, police officials and block development officers to stop hunting and fishing of the mammals,” senior officials said.

Patna District Magistrate J K Sinha said that instructions from chief minister has been passed
to senior officials, including sub-divisional officers, magistrates, police officers and block development officers to ensure close surveillance and act swiftly to stop hunting of the aquatic animal.

“Schools will take steps to aware the students about the gangetic dolphin which would

boost eco-tourism in the region,” he added.

Although the Wildlife Protection Act of India mandates dolphin conservation as a priority, little has been done at the government level to implement or enforce the law.

Where is Bihar?

Bihar is an Indian state located in the eastern part of the country. It is bordered by Nepal to the north, Jharkhand to the south, Uttar Pradesh to the west, and West Bengal to the east. The state is bisected by the Ganga River which flows through the middle of the state from west to east.

What is Ganga?

Outside India, the Ganga River is more commonly known as the Ganges River.

What is the Gangetic dolphin?

The Gangetic dolphine, also known as Ganges dolphin, Ganges river dolphin, Blind dolphin, and Side-swimming dolphin, is a dolphin endemic to the Ganges-Brahmaputra-Meghna and Karnaphuli-Sangu river systems of Nepal, India, and Bangladesh. Its scientific name is Platanista gangetica and it is listed as Endangered on the IUCN Red List of Threatened Species. The current population consists of 1,200-1,800 individuals, and roughly half of these are found in Bihar and Uttar Pradesh.

It is referred to as the Blind dolphin due to its poor eye-sight which is probably an adaptation to the murky waters of the Ganga River.

This Sunday, a mile-long super pod consisting of over 1,500 dolphins was encountered by eight lucky Sea Trust volunteers off the coast of Pembrokeshire, UK.

The volunteers were doing a small boat survey when suddenly confronted with what they first thought was a blizzard in the distance.

“As we approached, we realised that the ‘blizzard’ was thousands of gannets* spreads out over a mile or more,” said Sea Trust founder Cliff Benson.

The enormous pod, consisting of adult dolphins and their offspring, formed a veritable wall as they hastily rushed thought the water, probably in pursue of fish.

“They just kept on coming pod after pod passing by the boat some came and looked at us but most just kept on going”, said Benson. “The gannets were like an artillery bombardment
continually diving in with an explosion of spray, just ahead of the line of dolphins.”

According to Benson, the pod was most likely the result of many smaller pods that had joined together to follow a huge “bait ball” of fish.

In August 2005, a similar super-pod was filmed off Strumble Head, and last weeks spotting of a second one has caused Benson to suggest that super-pods might be a regular phenomenon in these waters.

* Gannets are a type of large black-and-white birds.

Most IWC* member countries accidently kill whales, e.g. by unintentionally ramming into them with motorized vessels or by using fishing methods that may entangle and suffocate these air-breathing mammals as accidental by-catch. While this type of accidental deaths is reported from most member nations, Japan and South Korea have an inordinate amount of accidental by-catchs, says Professor Scott Baker, associate director of the Marine Mammal Institute at Oregon State University.

By analysing the DNA of whale-meat products sold in Japanese markets, Baker, a cetacean expert, and Dr Vimoksalehi Lukoscheck of the University of California-Irvine, found that meat from as many as 150 whales came from the coastal population. Japan’s scientific whaling program only targets whales from open ocean populations, but whales accidently killed outside the program are allowed to be sold.

Humpback Whale

Japan and South Korea are the only countries that allow the commercial sale of products derived from whales killed as accidental by-catch and the sheer number of whales represented by whale-meat products on the market suggests that there might be something fishy about these allegedly accidental kills.

They DNA study showed that nearly 46 percent of examined Minke whale products came from a coastal whale population, which has distinct genetic characteristics, and is protected by international agreements. In addition to minke whales, Baker and Lukoscheck also found DNA from Humpback whales, Bryde’s whales, Fin whales, and Western gray whales.

“The sale of bycatch alone supports a lucrative trade in whale meat at markets in some Korean coastal cities, where the wholesale price of an adult minke whale can reach as high as $100,000,” Baker said. “Given these financial incentives, you have to wonder how many of these whales are, in fact, killed intentionally.”

In January 2008, Korean police launched an investigation into organized illegal whaling in the port town of Ulsan, reportedly seizing 50 tons of minke whale meat.

Japan has asked the IWC, who is holding its annual meeting this week, to allow a small coastal whaling program in Japanese waters. This request is something that professor Baker says should be scrutinized carefully because of the uncertainty of the actual catch and the need to determine appropriate population counts to sustain the distinct stocks.

Baker and Lukoscheck have presented their findings to the IWC commission and the study will also be published in a forthcoming issue of the journal Animal Conservation.

* International Whaling Commission

Norway, one of the two countries that openly defy the IWC ban on commercial whaling, has suspended this year’s whale hunt mid-season after catching less than half the quota of 885 whales. The suspension coincides with this week’s annual IWC meeting in Portugal, but is not linked to the meeting or any adjacent negotiations. Instead, a lack of demand in the Norwegian distribution chain is cited as the reason behind the surprising deferment.

“The number of whales killed so far is enough to meet the known demand,” said Willy Godtliebsen, head of sales at the Norwegian Fishermen’s Sales Organisation (NFSO). “They may resume the hunt later if new buyers turn up.”

According to NFSO marketing director Lise Mangseth, the suspension is an effect of the current financial crisis. The financial situation has dissuaded processing plants from freezing and stocking the meat the way they normally do, in order to save money.

“More generally, [the suspension is due to] organisational problems rather than a problem of demand,” Mangseth said. “The whalers are such small actors and the volumes from the hunt are so limited that the distribution chains don’t really want to invest in their product and there are no marketing campaigns as there are for other food products“.

She also claimed that it isn’t unusual for whalers to take a break during the season.

Greenpeace are interpreting the suspension as a sign of waning consumer demands for whale meat.

“If they don’t start the hunt again later this season, 2009 will be the ‘worst’ year for whaling since Norway resumed commercial whaling”, Greenpeace spokesman Jo Kuper said.

Norway resumed whaling in 1993, despite international protests. When Norwegian whalers were asked to suspend their hunt on Tuesday this week, 350 Minke whales had been harpooned since the start of the whaling season in April. Normally, the hunt would continue until October.

Australia and New Zealand announced Thursday that they will carry out a six-week long non-lethal whale research expedition in the Antarctic early next year. Dubbing the expedition non-lethal is a direct challenge to Japan’s research program that kills up to 1,000 whales a year.

Iceland and Norway are the only two countries openly defying the IWC ban on commercial whaling; Japan is instead using a lope whole that allows for “lethal research”. Whale meat resulting from the Japanese research is sold for human consumption and many critics claim that this is the real motive behind the program.

In a joint statement, Australia and New Zealand announced their intentions to reform science management within the International Whaling Commission, which holds its annual meeting in Madeira, Portugal, next week, and end Japan’s “so-called scientific whaling.”

“This expedition and the ongoing research program will demonstrate to the world that we do not need to kill whales to study and understand them,” said Australian Environment Minister Peter Garrett.

The expedition aims to increase our knowledge of population structures, abundance, trends, distribution, and the ecological role of whales in the Southern Ocean.

During the latest Japanese hunt, which ended in April, 679 minke whales and one fin whale was killed over a period of five months.

According to the Whale and Dolphin Conservation Society (WDCS), Greenland intends to ask permission to hunt a quota of 50 humpbacks over five years. The request will be put forward at an international key meeting on Tuesday where the 40 year long moratorium on whaling will be discussed.

“The WDCS urges member states and the Czech presidency [of the European Union] not to put at risk the EU’s reputation for commitment to the conservation of the world’s whales,” WDCS spokesman Nicolas Entrup said in Lisbon, Portugal.

On Tuesday, the annual meeting of the International Whaling Commission (IWC) will commence on Madeira, a Portuguese island.

Humpback whale
The humpback whale (Megaptera novaeangliae) is a baleen whale found in all the major oceans (not including the Mediterranean and the Baltic Sea) in a wide band running from the Antarctic ice edge to 65° N latitude. It is known for its knobbly head and its habit of frequently breaching and slapping the water; a practise which has made it especially popular among whale watchers. The purpose of the famous humpback whale song produced by the males remains unclear, but it is believed to play a role in reproduction. This whale song lasts for 10-20 minutes and is repeated for hours at a time.

The introduction of the explosive harpoon in the late 1800s and increasingly better ships made it possible for whalers to drastically accelerate their take, which soon led to a sharp decline in most whale populations, including the humpback whale. An estimated number of 200,000 humpbacks where taken during the 20th century, reducing the global population by over 90% and bringing the North Atlantic population down to a mere 700 individuals. When the ban on commercial humpback whaling was introduced by the IWC in 1966, the global population consisted of an estimated 5000 whales.

Today, the Humpback has made a promising comeback. In 2008, it was moved from the “Vulnerable” section on the IUCN Red List of Threatened Species and has since then been listed as “Least Concern”, although two subpopulations remain endangered.

According to the U.S. National Oceanic and Atmospheric Administration (NOAA), over 50,000 humpbacks can be found in the Southern Hemisphere, while the North Pacific Ocean is home to 18,000-20,000 individuals and the North Atlantic population comprises about 12,000 specimens.

The main threats to the humpback whales are today entanglement in fishing equipment, ship collisions, and noise pollution.

A new study funded by the U.S. navy and the Office of Naval Research show that Beaked whales are at higher risk of developing decompression sickness since they live with extremely high levels of nitrogen in their blood and body tissues. This may explain why beaked whales seem to be especially susceptible to naval sonar. If the sonar causes the animals to surface more rapidly than they would normally do, e.g. because they are frightened by the underwater sounds, it may lead to decompression sickness which may in turn explain the strandings associated with naval sonar exercises.

Decompression sickness, commonly referred to as “the bends” among scuba divers, is a consequence of the sudden drop in pressure that occurs when you ascend rapidly from the deep. When mammals dive, nitrogen builds in our bodies. If we ascend slowly the nitrogen isn’t dangerous, but if we ascend too quickly the nitrogen forms bubbles inside the body. Tiny bubbles might not sound like anything to fuzz about, but within the body it can be lethal.

Beaked whales are believed to accumulate large amounts of nitrogen within their bodies since they make repeated dives to such great depths. They can stay submerged without breathing for long periods of time and are capable of descending down to nearly 1,500 metres. Having this inclination for decompression sickness may explain why beaked whales seem to be more vulnerable to naval sonar than other marine mammals.

“It provides more evidence that beaked whales that are being found dead in association with naval sonar activities are likely to be getting decompression sickness,” said Robin Baird, a marine biologist at Cascadia Research Collective and one of the report’s authors.

The study has focused on three species of beaked whale: Cuvier’s beaked whale (Ziphius cavirostris), Blainville’s beaked whale (Mesoplodon densirostris), and the Northern bottlenose whale (Hyperoodon ampullatus). The Northern bottlenose whale was studied off the cost of Nova Scotia, Canada while the two others were observed around Hawaii, U.S.

According to a 2006 report in the Journal of Cetacean Research and Management, 41 known cases of mass strandings of Cuvier’s beaked whales have occurred since 1960. Some of them have happened at the same time as naval sonar exercises in the area, including Greece in 1996, the Bahamas in 2000, and the Canary Islands in 2002. When the beaked whales stranded in Bahamas were autopsied, they turned out to have bleedings around their brains and ears; bleedings which may have been caused by nitrogen bubbles.

The U.S. navy has agreed to adopt certain practises to protect whales, but is resisting more stringent restrictions until more scientific evidence is at hand. The navy has budgeted 26 million US per year over the next five years to fund marine mammal research on how these animals are affected by sound.

If you wish to find out more about the beaked whale study, it is published online this week in the journal Respiratory Physiology and Neurobiology.

Bottle nosed dolphins living along the coast of Florida are getting used to supplement their diet by snatching bait from fishing lines or circle recreational anglers practising catch-and-release. Some dolphins have even made a habit out of routinely approaching humans to beg for food.

Scientists at the National Marine Fisheries Service have now been able to show that this behaviour is spread down through generations of dolphins.

“We are able to document lineage, from grandmother to mother to calf, all following fishing boats and taking thrown-back fish,” says Jessica Powell, a National Marine Fisheries Service biologist.

Dolphins begging for food might be an endearing sight, but approaching humans in this fashion means taking a great risk. In 2006, three dead Sarasota Bay dolphins turned out to have fishing lures stuck inside them.

“Whenever animals become reliant on humans for food, it puts them at jeopardy,” says Dr. Randy Wells, director of dolphin research at Sarasota’s Mote Marine Laboratory. “If they are coming to boats or piers to get fish, they are swimming through a maze of lines, hooks and lures and those lines are designed to be invisible under water.”

Some dolphins do however seem to have figure out how to stay clear of harms way. A bottlenose dolphin nicknamed “Beggar” has been soliciting free meals in a narrow stretch of Intracoastal Waterway near Nokomis Beach since he was a juvenile 20 years ago. Despite routinely swimming just inches from boat propellers, the skin of Beggar’s 8 feet long body is free of major scars. Hopefully, the same is true for the inside of his 400 pound body.

As if the menace of razor sharp propeller blades, invisible fishing lines and jagged double hooks weren’t enough, bottlenose dolphins also stand the risk of encountering anglers who may not appreciate having their bait or catch snatched away by a hungry cetacean. A commercial fisherman out of Panama City, Florida has been sentenced to two years in prison after throwing pipe bombs at dolphins trying to steal his catch. Off Panama City, tour operators have been feeding dolphins for years to assure their presence at the popular “swim-with-the-dolphins” tours.

Feeding the Florida dolphins is illegal under both state and federal law, with federal law banning wild dolphin feeding in the early 1990s. Feeding wild dolphins can also be dangerous and the abovementioned “Beggar” dolphin has for instance sent dozens of overfriendly patters to the hospital for stitches and antibiotics.

Hand-feeding aside, a severe red tide in 2005 seems to have made the habit of interacting with humans for food much more widespread than before among the Florida dolphins. The red tide wiped out 75-95 percent of the dolphin’s usual prey fish and the hungry dolphins eventually realised that they could fill their bellies by picking bait fish off fishing lines.

“We suspect that the dolphins were
hungry,” Wells explains. “Their main prey
base was gone. Seeing a fresh pin fish
dangling from a line might look pretty
good to them. And once they learned
that anglers are a source of food, they
don’t forget that very quickly.”

This Saturday, about 55 False killer whales (Pseudorca crassidens) stranded on Long Beach, Kommetjie, in South Africa. Both adults and calves began to appear on the shore around 5.30 in the morning, perhaps as a result of the bad weather. This incident is the second large stranding in a short period of time; in March about 80 whales stranded in Hamelin Bay on Western Australia’s southern coast.

Massive whale strandings are however not new phenomenon; Long Beach was for instance the site of a heartbreaking stranding in 1928 when 103 whales beached on Christmas Eve. This was before marine experts and volunteers had figured out how to save stranded whales, so all 103 animals died in the scorching sun. This was also during a period when whales were chiefly seen as something that you hunted; not something worth saving.

So, why do whales beach? Scientists are still in the dark on when it comes to this bewildering question and no hypothesis has been confirmed yet. In his book “Whales and Dolphins of the Southern African Subregion”, whale researcher Peter Best lists a long row of hypotheses – all of the seemingly plausible – and also states that whale strandings may be due to a combination of several factors.

“It is very likely that no single cause is responsible and elements of some hypotheses may have to act in combination to produce the circumstances for a mass stranding to occur”, Best explains.

Here are some hypotheses put forward by marine scientists:

• Parasites infesting the middle ear can cause severe disorientation and make it difficult for whales to navigate. If one or several animals in a group develop middle-ear problems, the other ones might follow them due to their social bonding, even if it means stranding on a beach.
• An injured or sick whale may send out a distress call that the others follow all the way up on the beach.
• If cetaceans navigate using the earth’s geomagnetic field, geomagnetic disturbances could make them disorientated and, if they’re unlucky, even cause them to beach.
• Beachings may be a density-dependent response, where a population approaching its carrying capacity suffers increased natural mortality.
• Whales hunting for food close to the shoreline may accidently strand themselves in the pursuit.
• Whales might end up on beaches after getting caught in a rip current, getting their sonar confused. A rip current (also known as rip tide) is a strong surface flow of water returning seaward from near the shore.
• Beaked whales seem to be extra sensitive to mid-range sonar, so human activities may be to blame for the stranding of beaked whales.

The 2009 whaling season has now started in the waters off Iceland.

Iceland and Norway are the only two countries that openly defy the international whaling moratorium; Japan is instead using a loop whole, claiming their whaling to be carried out for scientific purposes.

Former Icelandic fisheries minister Steingrimur Sigfusson said in February that Iceland would make no changes to its whaling quotas of 150 Fin whales and up to 150 Minke whales per year.

“The first batch of meat will be in stores by the weekend,” says Gunnar Bergmann Jonsson, manager of the Minke Whaler Association. He said 50 to 60 per cent of the meat will be sold domestically, while the rest is sold to Japan.

The first whales are usually killed in a bay outside Reykjavik, since whaling is prohibited close to the harbour. The prohibition has been imposed to prevent whalers from disturbing whale watchers, since that may cause damage to the Icelandic whale watching business.

The Icelandic whaling season usually runs from May to late September.

Whale facts
Also known as Little Piked Whales or Lesser Rorquals, Mink Whales prefer icy waters but are found world-wide. Once perceived as one single species, the population has quite recently been recognized as consisting of two distinct species: the Northern Mink Whale, Balaenoptera acutorostrata, and the Southern Mink Whale, Balaenoptera bonaerensis. Together, the two species are believed to form a population of over 1 million Minke Whales world-wide. Balaenoptera acutorostrata is listed as Least Concern on the IUCN Red List of Threatened Species, while Balaenoptera bonaerensi is listed as Data Deficient since it was recognized as a separate species so recently.

The Fin Whale (Balaenoptera physalus) is also found world-wide, with 40,000-56,000 specimens living in the North Atlantic. Unlike the Mink Whale, the Fin Whale is listed as Endangered on the IUCN Red List of Threatened Species.

Photograph created by Erik Christensen. Taken on the Faroe island not Island.