Sentences with phrase «many shark populations»

Shark populations around the world started to plummet, with more than a quarter of shark and ray species now at risk of extinction.

Marine life faces continued threats, but the recovery of the shark population is a sign that humans are doing something right.

However, while working with Michael Meyer, a marine scientist from the Department of Environmental Affairs, and shark conservationist Michael Rutzen from Shark Diving Unlimited, Dr Andreotti realised that the software needed some more tweaking if it were to fit the ideal of sustaining a large database for the long - term monitoring of the white shark population.

So far, the information has been cited in more than 50 scientific publications; it has helped researchers analyze shark population declines and identify two new species of colorful fish — the Florida barred hamlet (Hypoplectrus floridae) and the contoy hamlet (H. ecosur).

The hammerhead shark population was the hardest hit, declining 89 percent since 1986.

Shark populations are plummeting, and since these predatory fish mature slowly and reproduce infrequently, their dwindling numbers aren't likely to rebound quickly, if at all.

This map pinpoints how far shark populations around the globe have fallen.

Ben G. Saroy, Head of Cendrawasih Bay National Park Authority, agreed, «Cendrawasih Bay, home to the biggest whale shark population in Indonesia, requires comprehensive information to manage this endangered species.

«Anyone who has spent time on the ocean over the last 20 or 30 years will tell you that they used to see lots of sharks and that they don't anymore,» says Boris Worm, a marine conservation biologist and leading expert in shark populations at Dalhousie University in Canada.

In the 1970s and 1980s, relative abundance data indicated that white shark populations declined, likely due to expanding commercial and recreational shark fisheries.

The earlier study also compared shark population numbers with other apex predators, such as polar bears and killer whales.

«Great white shark population in good health along California coast.»

To get a better picture of the white shark population in the Eastern North Pacific, the team decided to examine several other known aggregation sites, from Mexico into British Columbia and Alaska.

In fact, the increase in the number of juvenile sharks is a positive sign of a recovering shark population.

«We see this as being an important part of new technology coming online to better track the health of shark populations, better understand their behavior and help do a better job with their conservation,» said co-author Paul DeSalles, a researcher in McCauley's lab.

The presence of so many female juvenile sharks may be of considerable significance to the global whale shark populations,» Thorrold said.

But perhaps the best boost for the white shark population is the remarkable recovery of a favored prey species, the northern elephant seal (Mirounga angustirostris), from fewer than 100 at the end of the nineteenth century to over 100,000 today.

Using the largest data set in the Northwest Atlantic, we show rapid large declines in large coastal and oceanic shark populations.

The team studied whether scuba diving activities have long - term consequences for shark populations.

The researchers went to Palmyra, a remote atoll in the central Pacific Ocean, where shark populations are healthy, fishing is not allowed and the majority of its near pristine underwater world is rarely dived.

Even in California, where monitoring is relatively good, estimates of the white shark population vary by an order of magnitude, from 500 to 5,000.

«Insights on whale shark populations and evidence for their historic rise, recent decline.»

Gabriel added, «Our study shows that with a little bit of training and a good sampling design, recreational divers collect very useful data that can be used to monitor shark populations over long periods of time and across large spatial areas.

Citizen science may be a useful and cost - effective means to increase knowledge of shark populations on coral reefs, but scientists do not yet know enough about how data collected by untrained observers compares to results from traditional research methods.

A team of scientists from Canada and Australia has discovered that a decline in shark populations is detrimental to coral reefs.

Increased age at maturity would make white sharks more sensitive to fishing pressure than previously thought, given the longer time needed to rebuild white shark populations.

Shark populations are declining globally, and scientists lack data to estimate the conservation status of populations for many shark species.

«The area still has healthy shark populations, and released reef or pelagic fish will simply be fast food for sharks,» he cautions.

An international team of researchers studying globally declining shark populations report today that they used carbon isotopes as biochemical markers in shark muscle tissue...

The effects of climate change are «swamped by the overfishing, pollution and anthropogenic damage to shark populations,» he said.

But while the numbers of shark attacks have been climbing, the uptick has less to do with an increasing shark population, but rather attributable to human encroachment of their territory.

Assist the Research Team of the Gili Shark & Marine Conservation Project, who work on a variety of marine citizen science research projects with the aim of improving shark populations and awareness in the Gili Islands and Indonesia.

From the beach, on a clear day there are unparalleled views of the Farallon Islands, home to one of the largest great white shark populations in North America.

These efforts, despite damaging the shark population, were shown to be ineffective in decreasing the number of interactions between humans and tiger sharks.

The third aim is to increase marine tourism and transform shark populations into a sustainable living resource by developing educational ocean experiences for all South Africans.

A registered non-profit organisation, Sharklife addresses the alarming exploitation of both shark populations and ocean fisheries in South African waters.

It provides breeding and feeding grounds for at least twenty - five endangered or threatened species; thirty - six marine mammal species, including blue, gray, and humpback whales, harbor seals, elephant seals, Pacific white - sided dolphins, and one of the southernmost U.S. populations of threatened Steller sea lions; over a quarter - million breeding seabirds; and one of the most significant white shark populations on the planet.

Buddy up with dive size fish at the world famous Cod Hole, witness Osprey Reef's shark population including hammerheads and grey whalers and cruise the Ribbon Reefs.

Enjoy Osprey Reef's 40 metres visibility, plummeting walls to 1000 metres and resident shark population.

This shark population is what attracts scuba divers to Shark Reef to interact with and observe the sharks.

Gili Shark Foundation monitors the shark population around the waters of the Gili Islands in Lombok, Indonesia and is dedicated to the protection and conservation of the sharks themselves as well as their habitat.

Known as one of the best dive sites in Asia, Sipadan is lush with coral life, an extraordinary marine ecosystem, and healthy green turtle and reef shark populations.

It may look rather ordinary but the hard coral reef just off Pacific Harbour's coastline (off the coast of Viti Levu) is home to many of the culturally significant shark population.

In Belize, Earthwatch Institute has a volunteer program to study shark populations and the value of marine protected areas.

La Paz is home to a unique and prolific Whale Shark population.

Initiatives that help conserve local and regional shark populations, like the Shark - Free Marinas Initiative or local and regional funds that directly support area research teams such as the Isla Guadalupe Conservation Fund, are just two examples of this commitment.

Taking Shark Diving to the extreme, the regular Shark population comprises 8 different species: Whitetip Reef Sharks, Blacktip Reef Sharks, Grey Reef Sharks, Tawny Nurse Sharks, Sicklefin Lemon Sharks, Silvertip Sharks, Bull Sharks and Tiger Sharks.

Aqua - Trek now operates the Ultimate Shark Encounter on nearby Lake Reef offering the best visibility, longer bottom time, a larger shark population and more regular tiger shark sightings!

This years research on Whale Shark Populations along the coast of the Yucatan shows that the Largest aggregation of Whale Sharks in the World is off the coast of Isla Mujeres and about 18 miles north of Cancun.

Pristine reefs, healthy shark populations, uncrowded sites and amazing wrecks can be experienced from a liveaboard visiting the fantastic dive sites of Sudan.