Sentences with phrase «shark populations by»

Sharks are an integral part of marine ecosystems, and shark hunting worldwide has reduced some shark populations by 90 percent in the last few decades.

Not exact matches

Although the authors don't know for sure whether shark numbers have gone up, they speculate that the population could have been boosted by fishing discards before all fishing in the area was banned in 2006.

This study also increased the number of genetic markers scientist can use to study the population biology of great white and related sharks, Stanhope said, by a thousandfold, from which they hope to further expand knowledge of these fascinating animals, many of which are in urgent need of conservation.

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.

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.

It is tough, they say, to sort out whether fish populations are hit harder by human fishing, the sharks» appetite, climate change or some other environmental shift.

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

This cove is inhabited by a healthy population of, you guessed it, sharks and sting rays, which visitors can don scuba gear and swim around with.

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: I met the founders, who are really friendly guys, dedicated to the protection of sharks in general but specifically to the population of bull sharks at Protea Banks, an area off the coast of southern KwaZulu Natal, which receives very little other protection and is exploited by uncaring and uneducated «sport» fishermen.

East coast clam and scallop beds are being ravaged by exploding populations of rays that were formerly kept in check by sharks.

Each creature's fleshy analogue has found itself and its comrades on some watch list for nigh extinction: the seas have run dangerously low of our gilled friends; nearly all the world's rhinos have been shot for trophies by some member of the Trump family or their kind; and orca and shark populations have declined precipitously.

By returning year after year to the same area to count the sharks, the researchers can get a better estimate of population trends.

Shark populations have dropped by 75 percent in the northwestern Atlantic over the same time period.

Plaintiff Oceana, Inc. («Oceana») on behalf of its adversely affected members hereby challenges the unlawful decision of the National Marine Fisheries Service («Fisheries Service» or «Defendants») to adopt and promulgate Amendment 5b to the Highly Migratory Species («HMS») Fishery Management Plan because it failed to establish measures necessary to end overfishing and rebuild the dusky shark population to a healthy level as mandated by the Magnuson - Stevens Fishery Conservation and Management Act («Magnuson - Stevens Act»).

Decimated by overfishing, by - catch, and shark finning, some shark populations have dropped by over 90 percent and, according to the IUCN Red List, nearly one - in - three sharks and rays are currently threatened with extinction.

Over the last 50 years, global shark populations have declined by 90 percent as a result of overfishing, which has been exacerbated during the last decades by the growing demand for shark fins, specifically to be used as the key ingredient in shark fin soup.

«Sharkwater» argues that the extinction of the shark — a creature whose population has been depleted by 90 percent in the past 30 years — could unbalance the ocean's ecosystem and accelerate the process of global warming.

As Oceana reports, «In recent decades some shark populations have declined by as much as 99 %.

A team of scientists led by Stony Brook University's Institute for Ocean Conservation Science has figured out that dusky sharks and copper sharks — both heavily hunted for their fins, with the dusky shark species classified as threatened by the IUCN — have distinct populations living along different areas of coastlines.

By looking closely at the «zip code» embedded in the DNA of the fin, the researchers can pinpoint from which population that shark came, and therefore get a step closer to finding out who is exploiting the species.

For example, the oceanic whitetip shark population has declined by 99 % during the second half of the twentieth century.

Stony Brook University reports that a team of scientists led by the university's Institute for Ocean Conservation Science has figured out that dusky sharks and copper sharks — both heavily hunted for their fins, with the dusky shark species classified as threatened by the IUCN — have distinct populations living along different areas of coastlines.

Populations of sharks have dropped by over 90 % in many places, and many species are on the brink of extinction.

Critically endangered populations of hammerhead and oceanic white tip sharks have plummeted by 70 % and 99 % in the North Atlantic respectively according to the International Union for Conservation of Nature.