There are other reasons to worry about the Pacific bluefin, such as overfishing and mercury contamination.
The popularity of carp in China has led to overfishing and a dwindling supply.
Launched in early 2011, Oceans 5 is dedicated to expanding marine reserves and constraining overfishing.
The scientists say the biggest threat to the dolphins is overfishing in the two neighboring seas.
Some of the biggest ecological risks come from cruise tourism, deforestation, overfishing and oil exploration.
The group's spokesperson on EU fisheries policy, Saskia Richartz, called it "a momentous shift away from overfishing".
BBC: Euro MPs back large-scale fishing reform to save stocks
But the minister in Reykjavik says the blame for overfishing cannot be laid solely at their feet.
The island's lobstermen had voluntarily agreed to set their pots only six months a year to prevent overfishing.
Another reason for overfishing is new technology (developed, aptly enough, for battlefields), which makes shoals easier to detect.
However, overfishing throughout the past century has so depleted these populations that they no longer fulfil this role.
However, it is not necessarily the poorest and most underdeveloped areas that are guilty of the worst overfishing.
CNN: Beating poverty could save coral reef fish, report says
In the mid-1990s, decades-long overfishing was replaced with a voluntary state program to address the needs of fish.
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The researchers said Mozambique Channel in particular is facing pressures from population growth, overfishing, urbanization and energy exploration.
Overfishing and deforestation have been some of the main causes for the reduction in the number of threatened species.
Thanks to decades of overfishing, too few fish swim in those waters anyway.
From the middle of last century the population of Chinese paddlefish has declined rapidly due to overfishing, habitat degradation and pollution.
Overfishing had slashed the annual catch in the deep seas along the southern Australian coast from 25, 000 tons to barely 5, 000.
In a place threatened by illegal fishing and overfishing, this unique stretch of reef helps promote natural biodiversity.
Fishermen have an incentive to work harder and travel farther, which can lead to overfishing: a classic tragedy of the commons.
So unless the world's fishing fleets covert to biofuels, there may be some hope for dealing with the subsidy of overfishing.
In the past two decades, the beluga's population has dropped by 90% as a result of overfishing, much of it illegal.
Just a few years ago, the government projected that the area was well on its way to recovery after decades of overfishing.
Beneath the water, though, overfishing has caused some fish stocks to collapse.
Dick James, of Northern Ireland's Fish Producers Organisation, said the problem of low cod stocks was down to climate change rather than overfishing.
BBC: NEWS | Science/Nature | North Sea cod fishing ban urged
He says industrial pollution, overfishing and a long history of rampant logging, legal and illegal, have done the real damage to the environment.
"We must focus on helping corals to adapt to climate change and on diverting people away from destructive practices such as overfishing, " Linden said.
He was already at odds with the federal government, notably over what he sees as its feeble response to American overfishing of Pacific salmon.
Atlantic bluefin tuna -- the most high-priced ocean fish in the world -- have declined by about 90 percent since the 1960s due to overfishing.
Responding to the debate, Defra minister Richard Benyon repeated criticism of discarding, and said that fishermen needed to be part of the solution of overfishing.
As top predators, overfishing of sharks disrupts complex oceanic food webs.
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