Fossil Shows New Fish Species That Looked, Ate Like Shark, Scientists Say

2017-08-09T13:13:52+00:00 August 9, 2017|

ELKO, Nev. -- A fossil found in northeastern Nevada shows a newly discovered fish species that scientists believe looked, and ate, like a shark. The fossil is what remains of a bony, sharp-toothed fish that would have been about six-feet-long (1.83 meters) with long jaws and layers of sharp teeth. The type of jaw and teeth on the fish suggest it would have chomped down on its prey before swallowing it whole, like a shark, the Reno Gazette-Journal reported.

Sharks Revealed As The Great Protectors Of Seagrass

2017-07-27T16:40:52+00:00 July 27, 2017|

Sharks, marine scientists say, are often misunderstood, described as ravenous man-eaters. In reality, sharks are critically important to the health of the world's oceans, yet a quarter of all shark species are threatened with extinction. For more than two decades, Florida International University marine scientist Mike Heithaus has been immersed in the world of sharks and other predators that help the sea maintain a delicately balanced food web. Heithaus' work is focused on predators in the waters of South Florida and across the globe in Shark Bay, Australia.

Why Scientists Are Racing To Uncover The Greenland Shark’s Secrets

2017-07-26T10:01:06+00:00 July 26, 2017|

Brace yourself. To human senses, the gelid waters of the Arctic and North Atlantic oceans are beyond chilling. Because sea water is salty, the waters can actually reach temperatures below what we think of as freezing (as low as 28.8 degrees Fahrenheit instead of the usual 32) and remain liquid. Without protective gear, the human body can withstand maybe 15 minutes of these temperatures before succumbing to unconsciousness; 45 minutes before death.

The Megalodon Was The Largest Shark To Have Ever Lived – Now We Know How It Disappeared

2017-07-03T15:24:09+00:00 July 3, 2017|

An artist’s impression of Carcharocles megalodon. (Photo credit: Karen Carr/CC) Large marine megafauna, including megalodon, the largest shark to have ever lived, disappeared during a global extinction event that had previously not been recognized as such. At the end of the Pliocene, between two and three million years ago, the planet entered a [...]

Member Highlight: Large Marine Protected Areas Effectively Protect Reef Shark Populations

2018-01-02T13:57:52+00:00 February 3, 2017|

Researchers at Stanford University's Hopkins Marine Station investigated the role of expanded marine protected areas (MPAs) on grey reef sharks and found that the aquatic no-fishing zones were an effective tool for protecting this near-threatened species. Originating 423 million years ago, sharks are a group of predators that span 490 species and still play crucial roles within their ecosystems. We often characterize these top predators as nearly indestructible monsters but, of course, that's far from the reality: They mature slowly, they don't have high numbers of offspring, and they're under serious threat due to the value of their fins.

Zebra Shark Surprises Scientists By Giving Birth Without Male

2017-01-18T16:53:10+00:00 January 18, 2017|

A female zebra shark in an Australian aquarium has astounded scientists by producing live offspring asexually, three years after being separated from her long-term mate. While scientists have previously observed "virgin births" in vertebrates such as sharks, rays and reptiles -- a reproductive strategy thought to aid survival during periods of isolation -- this is the first time a female shark has ever been observed reproducing asexually after previously mating with a male.

DNA Collected From Seawater May Solve Mysteries About World’s Largest Fish

2016-11-23T12:22:17+00:00 November 23, 2016|

Using only the DNA from sloughed-off cells floating in the ocean, scientists have been able to determine the population size and genetic properties of one of the world’s largest and most mysterious animals: the whale shark. The work marks the first time researchers have been able to use so-called environmental DNA (eDNA) to estimate the genetic characteristics of an aquatic species, and it could help scientists study the population and health of a wide range of marine animals without ever setting foot in the water.

Two-Headed Sharks Keep Popping Up—No One Knows Why

2016-11-04T09:12:10+00:00 November 3, 2016|

Two-headed sharks may sound like a figment of the big screen, but they exist—and more are turning up worldwide, scientists say.A few years ago off Florida, fishermen hauled in a bull shark whose uterus contained a two-headed fetus. In 2008, another fisherman discovered a two-headed blue shark embryo in the Indian Ocean.

Waste Not, Want Not

2016-11-01T09:51:47+00:00 November 1, 2016|

AMMONIA is as repulsive to most marine animals as it is to land-lubbing ones—and for good reason. It is extremely toxic. But there is an exception. Far from being repelled by ammonia, sharks are actually attracted to it. The longtime assumption has been that this is because it is a waste product, voided into the water by fish and other creatures, that signals the presence of potential prey.

New Large Prehistoric Shark Described

2016-10-04T08:54:53+00:00 October 4, 2016|

Megalolamna paradoxodon is the name of a new extinct shark described by an international research team who based their discovery on fossilized teeth up to 4.5 centimeters (1.8 inches) tall found from the eastern and western United States (California and North Carolina), Peru and Japan.

Load More Posts