Blog Tags: Dolphins
As a child, you may remember squealing and screaming when you were excited about something. It turns out that humans aren’t the only species that gets noisy when they’re happy: New research shows that whales and dolphins “squeal with delight” to express glee, too.
When you’re out swimming or surfing at the beach, have you ever wondered which ocean animals surrounding you have teeth? It turns out that sharks aren’t the only marine animals with teeth—a tool in some marine animals may be more widespread than you thought.
From hundreds of sharp, razor-blade-like teeth in great white sharks to the singular long, spiraled tooth on narwhales, teeth come in all shapes in sizes in marine ecosystems. This diversity is for good reason—some use their teeth to shred and slice prey, while others use their teeth more as a harpoon.
Bottlenose dolphins off the coast of Western Australia are stealing the spotlight from Aussie surfers, and are proving that humans aren’t the only ones capable of catching that perfect wave.
Atlantic dolphins are in danger, and Miranda Cosgrove needs your help to save them. Recently, she joined Oceana in Bimini, Bahamas to swim with Atlantic spotted dolphins and film a new public service announcement (PSA) about how seismic airguns could harm Atlantic dolphins.
“When I first entered the water, the dolphins were playing with each other, swimming side by side, and they were constantly singing to each other—I could hear it! After a while they started to approach me and I could feel them look me in the eye. It was one of the best experiences of my life,” said Cosgrove.
Oceana’s climate and energy campaign had an eventful April. In our ongoing effort to stop East Coast offshore drilling before it starts, we’ve been working hard to prevent the oil industry from taking the first step toward drilling: seismic airguns to explore for oil.
The specifics of seismic airgun testing are worth understanding if only because the oil industry seems to be counting on Americans’ lack of knowledge about this highly specific technology in order to get a foothold in some ocean areas that have been protected from drilling since the Reagan administration.
The dolphin drive hunt in Taiji, Japan has been at the center of animal activism for many years and now it has finally come to the center of science.
The dolphin drive in Taiji involves the corralling of dolphins into a cove for slaughter or to be removed and then sold to representatives from marine parks. An estimated 22,000 small whales, dolphins, and porpoises are killed in these hunts each year.
Dr. Andy Butterworth of the University of Bristol and colleagues have published a paper in the Journal of Applied Animal Welfare Science analyzing the methods used by Taiji fishermen to kill the dolphins in the drive hunts. Through their analysis, the authors have revealed disturbing levels of physical trauma inflicted on the dolphins, and commented that these methods would not be acceptable under any international animal welfare standards.
The paper has compared the information provided by the Japanese government on the dolphin slaughter with video footage of the methodology and concludes that the current methodology leads to prolonged trauma and paralysis, which contradicts the information in the government report.
The publication of this paper has raised awareness of the dolphin slaughter within the scientific community and has elevated the issue to a peer reviewed scientific journal, raising the profile of the travesty in Taiji. This added pressure from the scientific community, which validates the efforts of so many advocacy efforts, could be what is needed to convince the Japanese government to end these hunts for good.
Video of the slaughter is available but be prepared, it is extremely disturbing.
American photographer Doug Perrine, 60, captured this priceless image of a false killer whale mid-grin off the coast of Kona, Hawaii.
Less commonly known than the killer whale (or orca), the false killer whale is the third largest member of the oceanic dolphin family. Growing to 1,500 pounds and up to 20 feet long, the false killer whale looks like no dolphin you’ve seen before. Its small conical head lacks the “beak” we expect in common dolphins, and its flippers have a distinctive hump along the front edge.
False killer whales were first discovered by their fossils in 1843, and were assumed to be extinct. In fact, the species wasn’t discovered alive until fifteen years after the discovery of their fossils. Like the gregarious-looking fellow captured in the photo, false killer whales are intensely social, forming strong social bonds in groups of ten to twenty that belong to larger groups of up to 40 individuals in Hawaii or as many as 100 elsewhere. False killer whales travel and hunt together in broad bands that can be up to several miles wide, and they even share their food with other group members.
Unfortunately, the false killer whale’s population numbers in Hawaii are nothing to smile at – these social creatures have suffered major decline in the last 25 years. According to the National Marine Fisheries Service, aerial surveys showed about 400 false killer whales in 1989. More recent studies suggest the number today is closer to 150. As of November 2012, false killer whales were listed as endangered in Hawaii, due in large part to the creature’s vulnerability to be caught as bycatch by tuna and swordfish fisheries. The false killer whales become hooked or entangled in longlines when they take bait off of longline fishing hooks set for Hawaiian swordfish and tuna, a dangerous mistake that often turns deadly.
The future for false killer whales is in danger, but with education, advocacy, and increased respect and protections for these social and gregarious sea creatures, we can give the false killer whale something to smile about.
Just a few weeks ago, an international campaign to stop the annual gruesome slaughter of dolphins in Japan was initiated by one Scottish woman hoping to make a difference. Shona Lewendon started a petition to the International Olympic Committee (IOC) requesting that Japan be denied the right to host the 2020 Olympic Games until they ban the annual slaughter of dolphins in the cove of Taiji, a tradition that has been occurring for a long time.
Within just five days of posting her petition online, she received 10,000 signatures. Since then, the petition has continued to grow, gaining more and more support from people all around the world. Her campaign has even won the support of the Whale and Dolphin Conservation Society.
We can breathe a momentary sigh of relief. This Monday, the Pacific Fishery Management Council voted unanimously to maintain protections off California and Oregon for the critically endangered population of Pacific leatherback sea turtles. However, in 2014 these federal fishery managers will consider another proposal for allowing driftnets into sea turtle habitat southwest of Monterey, California.
At the meeting a few days ago in Tacoma, Washington, the Council considered a full array of proposals to expand the use of drift gillnets off California and Oregon and into an area currently designated to protect Pacific leatherback sea turtles. But Oceana—with the help of our partners, and support of our avid Wavemakers—successfully thwarted those efforts by presenting new science on the decline of leatherback sea turtles; by revealing scientific data showing massive wasteful bycatch of large whales, dolphins, sharks, and other fish by the drift gillnet fishery; and by bringing forward the public uproar over the proposed expansion of the driftnet fishery into a currently protected area.
Mile-long drift nets hang like invisible curtains in the water column to catch swordfish, but they unselectively entangle other marine life traversing through the open ocean. To numerically paint the portrait of this wasteful fishery, for every five swordfish caught in 2011, one marine mammal was killed and six fish were tossed back dead. When it comes to whales, this fishery takes many species, but one of particular concern is the sperm whale. The largest of the toothed whales, sperm whales have the largest brain of any animal and it is estimated that 16 of these amazing endangered whales were taken in the drift gillnet fishery in 2010 alone.
Yesterday, members of both the U.S. House of Representatives and Senate sent letters to President Obama urging him to stop proposed seismic airgun testing in the Atlantic Ocean.
The U.S. Department of the Interior (DOI) is currently deciding if seismic airgun testing should be allowed to search for oil and gas in the Atlantic Ocean off the coasts of seven states from Delaware to Florida.
This type of seismic testing involves the use of airguns, which are towed behind ships and shoot loud blasts of compressed air at 250 decibels through the water and miles into the seabed to search for deep oil and gas deposits. These airguns make intense pulses of sound, almost as loud as explosives, every 10 seconds, 24 hours a day, for days to weeks on end. The blasts are so loud and constant that they can injure or disturb vital behaviors in fish, dolphins, whales and sea turtles.
Marine life impacts can include temporary and permanent hearing loss, abandonment of habitat, disruption of mating and feeding, and even beach strandings and death. If approved, seismic airguns will threaten endangered species, fisheries and coastal economies throughout the Atlantic.
These disruptive airguns are unnecessary and dangerous and here are the top 10 reasons why:
1. Seismic airgun testing is the first step towards deepwater drilling, the same practice that brought us the Deepwater Horizon oil spill disaster in 2010.
2. Seismic airgun testing will injure about 138,500 whales and dolphins, nine of which are North Atlantic right whales, one of the most endangered species on the planet, based on DOI’s own study, which may underestimate the impacts.
3. In Peru in early 2012, 900 dolphins and porpoises washed up on shore dead with physical signs of damage to their ear bones following seismic airgun testing. In 2008 a similar mass die off occurred for dozens of melon-headed whales in Madagascar after testing.
4. Because it displaces fish and can harm fisheries, seismic airgun testing threatens over 200,000 jobs in commercial and recreational fishing.
5. There are less harmful technologies than airguns on the horizon but they are not being considered by DOI.
6. Seismic testing or drilling in the Atlantic would not reduce U.S. gas prices by even a penny.
7. Oil and gas companies already own oil and gas leases on millions of acres of federal lands and waters, many of them are inactive and have not been developed.
8. The burning of oil and gas contributes to global climate change and ocean acidification, so new drilling in the Atlantic is not the solution to our energy challenges.
9. There is no need to conduct seismic airgun testing now, since the administration does not plan to hold oil and gas lease sales in the area until at least 2017.
10. Atlantic offshore wind could supply more jobs and energy than oil and gas in the region.
Learn more about the harmful impacts of seismic airguns and tell the President to protect whales and dolphins in the Atlantic, not drive them away.
- Ocean Roundup: Florida Receives Federal Help for Oyster Recovery, Climate Change Linked to Iceland’s Puffin Decline, and More Posted Thu, August 28, 2014
- Ocean Roundup: Methane Seeping from U.S. Atlantic Seafloor, Iceland’s Caught Scores of Endangered Fin Whales, and More Posted Mon, August 25, 2014
- Leatherback Sea Turtle Rescued from Fishing Gear Posted Fri, August 29, 2014
- Creature Feature: Barnacles Posted Tue, August 26, 2014
- Court Requests Changes to the North Pacific Fisheries Observer Program be Reconsidered Posted Thu, August 28, 2014