8th October 2009

Two-spot Octopus Hunting at Night in Catalina

The Aquarium of the Pacific’s Director of Education and our Director of Cephalopods, Dr. James Wood, found two amazingly cooperative two-spot octopuses (Octopus bimaculoides) while looking in tidepools at night on Catalina Island off of Southern California. This video shows the octopuses hunting, cleaning, squeezing through a crevice, and more. See Dr. Wood’s site “The Cephalopod Page” for more information about this amazing group of marine animals. We also recommend checking out the Octopus bimaculoides (Bimac/Californian Two-spot Octopus) Care Sheet at Tonmo.com.

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17th August 2009

The Cove

I can’t wait to see this movie. I blogged awhile back about the face-off between the bloodthirsty Japanese fishermen who drive whales and dolphins into a cove in Taiji Japan for mass slaughters and the protesters including Hayden Panettierre (Heroes star) and Surfers for Cetaceans who successfully raised awareness about the issue awhile back. The Cove is now in theaters and it’s getting great ratings. I hope it will help stop the inhumane and gory practice of drive hunting whales and dolphins. Check it out:

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12th August 2009

Killer schmiller – whales need love too!

MarineBio Director of Marine Mammals discovers that killer whales create and visit social clubs just like people do

Story from BBC:

Up to 100 fish-eating killer whales come together in the Avacha Gulf, off the coast of Russia. But no-one knew why the whales form these huge superpods, when they normally live in smaller groups.

Now scientists report in the Journal of Ethology that these groups act as clubs in which the killer whales form and maintain social ties.

Fish-eating killer whales (Orcinus orca) in the Avacha Gulf live in stable groups called pods that contain an average of ten individuals and up to 20 in the largest pods.

But researchers have seen up to eight of these pods coming together to form large groups of up to 100 animals.
As far as the eye can see, in every direction you see killer whales surfacing

Erich Hoyt, WDCS

These large aggregations of pods are seen in numerous places around the world where large numbers of killer whales occur such as British Columbia, Alaska, Iceland and Antarctica.

It is unlikely that the whales gather for protection as they have no natural predators.

In the past researchers have suggested that the whales meet to increase their foraging success or to breed.

But the behaviour has not been quantified before.

To investigate, Olga Filatova of the Moscow State University and colleagues from the Far East Russia Orca project observed and photographed whales in the Avacha Gulf from a 4m long boat.

“At first we might see just a few spouts on the horizon. Then quickly we move among them, keeping a distance of a hundred metres so as not to bother them,” explained project co-director Erich Hoyt of the Whale and Dolphin Conservation Society (WDCS), which provided the majority of funding for the project.

“As far as the eye can see, in every direction you see groupings of two to six killer whales surfacing, spouting then dipping below the surface.”

“Each grouping has a focal mother figure surrounded by her offspring, some of whom may be full grown males with up to 2m dorsal fins that tower over the females,” he says.

They also used a special underwater directional microphone called a hydrophone to record the sound of the whale vocalisations.

Each pod of fish-eating killer whales in the Avacha Gulf has a specific vocal dialect which could be pinpointed by the hydrophone, while individual whales can also be identified by the shape of their dorsal fins and markings.

That allowed the scientists to analyse the whales’ behaviour.

The whales rarely forage and feed when they gather into a much larger superpod, the scientists found.

That suggests they do not gather to herd fish or increase their foraging success. In fact, say the scientists, depending on the type of prey, a superpod might have the effect of decreasing the feeding success of each whale making it unproductive to feed in large groups.

However, the whales did interact much more during these large gatherings that lasted from a few hours to almost half a day.

When meeting whales from other family pods, they made contact with each other, swam in synchrony and rubbed flippers much more often, the researchers found.

Sexual activity also increased, suggesting that these big aggregations provide a chance to assess potential breeding partners.

However, these behaviours likely have a greater function beyond reproduction, the scientists believe.

Club life

They enable the whales to establish and maintain social bonds and it is for that reason that the whales gather in core meeting areas and form large aggregations.

“The superpods are like big social clubs,” says Hoyt. “These clubs could help them stay acquainted, could be part of the courting process but could have other functions that we need to learn about.”

Maintaining social bonds is crucial for many social mammals which live and hunt together.

Looking for a mate?

But maintaining connections with the wider community may be especially important for killer whales, which tend to live long lives in relatively small communities with low birth rates.

Killer whales also face challenges with high calf mortality rates which may be as high as 50% in the first six months.

“Understanding more about their social lives, including their reproduction, will be crucial to our future understanding of them and our ability to keep their population healthy,” Hoyt says.

The team has also recently extended the study outside of the Avacha Gulf further north and south along the Kamchatka coast and to the offshore Commander Islands to learn more about other killer whale groups, including the mammal-eating type of killer whale that feeds on porpoises, seals and sea otters.

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26th March 2009

US Government subsidized nets jeopardizing future for development

The United States Agency for International Development is jeopardizing the future of development for east Africa by distributing destructive fishing nets to African fishermen:

Kenya Wildlife Perishes in Nets Bought with US Aid
By KATHARINE HOURELD

DIANI, Kenya (AP) — Plastic fishing nets — some bought for poor fishermen with American aid money — are tangling up whales and turtles off one of Africa’s most popular beaches.

One recent victim was a huge dappled whaleshark that bled to death after its tail was cut off by fishermen unwilling to slash their nets to save it. In another case, divers risked their lives to free a pregnant, thrashing humpback whale entangled in a net last summer.

Both incidents occurred off Diani beach, which is popular with American and European tourists.

The fishermen have traditionally used hooks and hand lines to haul in their catch, which they then sold to hotels full of tourists. But the use of plastic nets has become increasingly common as growing populations have competed to catch shrinking supplies of fish, marine biologist David Obura said.

In 2003, USAID began a four-year project worth $575,000 to improve the lives of coastal communities. It worked on a project with a Kenyan government agency that included providing freezers for the fishermen to store their catch, along with boats and nets.

But the plastic nets are destroying the very ecosystems that the fishermen depend on and the tourists come to see, said Daniel Floren, who runs a local diving school.

Officials, experts and even the fishermen themselves acknowledge the nets are killing wildlife and coral.

“Without the reefs, there will be no diving. If we have nothing to show, I’ll have to shut up shop,” Floren said.

The aim of the U.S. project was to help lift local people out of poverty, said Robert Buzzard, a USAID official involved in the initiative. But there were no studies to show how the kind of equipment supplied might affect the marine life.

“There weren’t environmental assessments year on year,” Buzzard acknowledged, saying USAID was “partly” responsible but also was dependent on local organizations to provide information.

The project did not provide the type of nets or long fishing lines — which catch fish without entangling other marine life — that fishermen requested, said Isaak Mwachala, head of one of the local fishermen’s associations.

“When they were going to the shop where these nets are sold, they didn’t bring us with them … but when (the nets) are already here we can’t refuse them,” he said.

Buzzard said he did not have records of Mwachala’s request, but said it was possible it had been made.

When Mwachala and his friends head out to sea, they often throw miles (kilometers) of plastic net onto the reef. The money they earn pays school fees for one man’s child, hospital bills for another’s. But along with the haul of colorful fish, the nets threaten turtles, whales, whalesharks and dugongs — large marine mammals related to manatees.

The fishermen, who say their old hook-and-line method never caught turtles or whales, practice conservation where they can.

After Floren offered small payments last year, they brought him more than 70 turtles snarled in fishing nets over a two-month period. It was not possible to say how many of them were trapped in nets funded by USAID. He managed to cut free and release all but a dozen. But the pregnant, entangled humpback whale last September was much harder.

It took Floren and two other divers three tense hours to cut her free, all the while risking panicking the whale and becoming entangled in the mesh themselves if she suddenly fled to the deep sea. A rare dugong and another humpback mother whale were freed a month later in the northern town of Malindi.

The huge dappled whalesharks that migrate down the coast are also at risk. Volker Bassen, founder of the East African Whaleshark Trust, said about half a dozen have become entangled in the type of nets funded by USAID since he founded the trust four years ago.

He said most marine animals are trapped by nets left on the reefs overnight to catch lobsters for the tourists.

“The nets that USAID bought are made of nylon, which doesn’t rot. Even if it washes away, it remains in the sea and continues to kill marine life for decades,” he explained. “It turns into a ghost net.”

The nets are still destructive even if just used during the day and hauled in at night. The stones they use to weigh down the nets scrape over the delicate corals in time with the current, snagging the nets along the bottom and leaving scraps of blue nylon entangled in their wake. Onboard the boat bought with USAID funds, the men casually tossed chunks of the coral they’d pulled up over the side of the boat.

The fishermen interviewed by The Associated Press agreed that their livelihoods depended on preserving the seas and were interested in trying long lines if they were provided.

But Buzzard said USAID’s involvement with the fishermen’s group had been finished for a year and a half, and there were no plans to replace the nets. Buzzard said a colleague had been sent to speak to local conservationists who had complained about the nets.

“Those concerns are valid,” he said. But “this project is finished … Every project we do, we learn from.”

Still, providing only one group of fishermen with new equipment would not be enough to save the marine life, said Obura, who specializes in studying coral reefs.

In addition to the growing groups of poor fishermen crowding onto the reefs, huge European and Asian trawlers much further offshore are overfishing the deeper coastal waters, he said.

“The fishermen have the strong sense that there are other, richer fishermen out there raping and pillaging the seas and so why shouldn’t they?” he said.

Fisherman Mohammed Khamis said the nets provided with USAID funds have increased the fishermen’s average daily earnings from $4.50 to $7 — still less than a tourist pays for a fish fillet at an expensive hotel.

Khamis knew the nets could be destructive, but had three sets of school fees to pay totaling $460 a year and no other options for work in a country riddled with corruption and poverty. He says he could not afford to sacrifice his children’s future for a turtle’s.

“If someone has a family, they have to look for school fees, sickness, everything,” he said. “We don’t eat these turtles and we don’t want to catch them but the extra fish is paying my children’s school for their future.”

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15th February 2009

Disneynature’s movie: Earth – Coming Earth Day, April 22, 2009

 

The first film in the Disneynature series, EARTH, narrated by James Earl Jones, tells the remarkable story of three animal families and their amazing journey across the planet we all call Home.

See more marine life related videos in the MarineBio Video Library >>

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