by DGR News Service | Mar 20, 2014 | Climate Change
By Renee Lewis / Al Jazeera
Climate change may be stunting fish growth, a new study has said. Fish sizes in the North Sea have shrunk dramatically, and scientists believe warmer ocean temperatures and less oxygenated water could be the causes.
The body sizes of several North Sea species have decreased by as much as 29 percent over a period of four decades, according to the report, published in the April issue of Global Change Biology.
The report presents evidence gathered as researchers followed six commercial fish species in the North Sea over 40 years. Their evidence showed that as water temperatures increased by 1 to 2 degrees Celsius, an accompanying reduction in fish size was observed.
It is generally accepted among scientists that decreased body size is a universal response to increasing temperatures, known as the “temperature size rule,” the report said. But before this report, led by scientists at Scotland’s University of Aberdeen, there was no empirical evidence showing this response in marine fish species.
The scientists warned that fish stunting cannot be unequivocally blamed on temperature changes, but they did observe fish stunting across varying species and backgrounds that coincided with a period of increasing ocean temperature.
Other factors that could have influenced fish size include fisheries-induced evolution and intensive commercial fishing — which favors larger specimens. But, the scientists said, these causes would not be likely to affect growth rates across species, which was observed in the North Sea study.
Scientists at the University of Washington have been working on a similar study, looking at many species of fish from Alaska to California. Tim Essington, an associate professor of aquatic and fishery sciences at UW who is working on the study, said he was looking into whether changes in fish body size could be related to environmental parameters.
“We haven’t seen the same strong response,” Essington told Al Jazeera. “But we have seen variation in the sizes of some stocks, like halibut. Its body size has been shrinking sharply over the past 10 years, and has resulted in reduced catch quotas and higher prices at the supermarket.”
He said various factors explain why UW results were different from those of the Scottish team. University of Aberdeen scientists were looking at a much more localized area and a unique data set, and had many more years of data to make comparisons.
Overall, Essington said the Aberdeen findings represented a plausible hypothesis that should be looked at more closely, and that warmer temperatures could explain the stunting.
“Fish aren’t any different than us. It’s all about the difference between how much we eat and how much energy we expend. And they’re arguing that temperature is changing the fishes’ energy versus expension rates,” which could result in smaller sizes, Essington said.
The Aberdeen findings echoed earlier model-derived predictions that fish would shrink in warmer waters. Those projections for future fish size reduction are already being seen in the North Sea, scientists said.
The first global projection of the potential for fish stunting in warmer, less oxygenated oceans was carried out by the University of British Columbia in 2012, and published in the journal Nature Climate Change.
The projection said changes in ocean and climate systems by 2050 could result in fish that are 14 to 24 percent smaller globally.
“It’s a constant challenge for fish to get enough oxygen from water to grow, and the situation gets worse as fish get bigger,” said Daniel Pauly, principal investigator with the University of British Columbia’s Sea Around Us Project, and the co-author of the UBC study.
The study warned that strategies must be developed to curb greenhouse-gas emissions or risk disrupting food security, fisheries and the very way ocean ecosystems work.
From Al Jazeera America: http://america.aljazeera.com/articles/2014/3/19/report-climate-changestuntingfish.html
by Deep Green Resistance News Service | Oct 25, 2012 | Toxification
By Leo Hickman / The Guardian
Oil companies operating in the North Sea have been fined for oil spills on just seven occasions since 2000, even though 4,123 separate spills were recorded over the same period, the Department of Energy and Climate Change (Decc) has confirmed.
The disclosure came as Decc said on Thursday that the government had offered a “record-breaking” 167 new licences to oil and gas companies seeking to drill in the North Sea. A further 61 “blocks”, or licences, are under environmental assessment.
Total fines resulting from prosecutions between 2000 and 2011 came to just £74,000 and no single oil company had to pay more than £20,000.
Two companies received fines of £20,000: BP, for causing 28 tonnes of diesel to spill into the sea in 2002 from the Forties Alpha platform, and, a year later, Total E&P, for causing six tonnes of diesel to enter the sea during a transfer between fuel tanks on the Alwyn North platform.
Information about the fines was released by Decc after a freedom of information request and further inquiries by the Guardian.
The smallest fines over this period were those imposed on two companies, Venture North Sea Oil and Knutsen OAS Shipping, of £2,000 each, after 20 tonnes of crude oil was spilt during a tanker transfer on the Kittiwake platform.
In total, 1,226 tonnes of oil were spilt into the North Sea between 2000 and 2011, according to Decc’s archives. Decc said there is no “volume threshold” determining whether a company will be prosecuted over a spill at sea, although a spill of less than five tonnes is unlikely to go to court.
A tonne of crude oil is broadly equivalent to seven barrels, or, more precisely, 1,136 litres.
Decc said its inspectors, all of whom have enforcement powers, judge each case separately to assess the circumstances and the seriousness of the alleged offence.
Slightly different arrangements exist in Scotland from those in England, Wales and Northern Ireland, for pursuing a prosecution.
A Decc spokesman said: “The UK has one of the toughest and most successful oil and gas regimes in the world and we work closely with industry to ensure the highest standards of environmental protection are in place and enforced.
“There are a number of enforcement options available to Decc, with court action reserved for serious offences. On the rare occasions legal proceedings have been deemed necessary, it is for the court to decide the level of fines to hand down.”
Environmental campaigners said it was worrying that Decc viewed itself as operating the global gold standard of offshore regulation, especially as oil companies were now pressing for permission to drill in extreme and vulnerable environments such as the Arctic.
Vicky Wyatt, a Greenpeace campaigner, said: “Ministers and oil companies can spout all the carefully crafted quotes they like to tell us how safe drilling at sea is. But while they’re spouting these words, their rigs are all too often spouting oil into our oceans. The government should hit these companies who pollute the oceans in this way with meaningful fines.
“A few grand is not even a slap on the wrist for companies who pocket millions of pounds every hour.
“It’s both staggering and wrong that some of these companies are now also drilling in the fragile and pristine Arctic, where a similar oil leak would be catastrophic.”
Read more from The Guardian: http://www.guardian.co.uk/environment/2012/oct/25/oil-companies-north-sea-spills
by Deep Green Resistance News Service | Sep 23, 2012 | Biodiversity & Habitat Destruction
By Gaia Vince / BBC News
Global fish stocks are exploited or depleted to such an extent that without urgent measures we may be the last generation to catch food from the oceans.
It has been some time since most humans lived as hunter-gatherers – with one important exception. Fish are the last wild animal that we hunt in large numbers. And yet, we may be the last generation to do so.
Entire species of marine life will never be seen in the Anthropocene (the Age of Man), let alone tasted, if we do not curb our insatiable voracity for fish. Last year, global fish consumption hit a record high of 17 kg (37 pounds) per person per year, even though global fish stocks have continued to decline. On average, people eat four times as much fish now than they did in 1950.
Around 85% of global fish stocks are over-exploited, depleted, fully exploited or in recovery from exploitation. Only this week, a report suggested there may be fewer than 100 cod over the age of 13 years in the North Sea between the United Kingdom and Scandinavia. It’s a worrying sign that we are losing fish old enough to create offspring that replenish populations.
Large areas of seabed in the Mediterranean and North Sea now resemble a desert – the seas have been expunged of fish using increasingly efficient methods such as bottom trawling. And now, these heavily subsidised industrial fleets are cleaning up tropical oceans too. One-quarter of the EU catch is now made outside European waters, much of it in previously rich West African seas, where each trawler can scoop up hundreds of thousands of kilos of fish in a day. All West African fisheries are now over-exploited, coastal fisheries have declined 50% in the past 30 years, according to the UN Food and Agriculture Organisation.
Catches in the tropics are expected to decline a further 40% by 2050, and yet some 400 million people in Africa and Southeast Asia rely on fish caught (mainly through artisanal fishing) to provide their protein and minerals. With climate change expected to impact agricultural production, people are going to rely more than ever on fish for their nutritional needs.
The policy of subsidising vast fishing fleets to catch ever-diminishing stocks is unsustainable. In Spain, for example, one in three fish landed is paid for by subsidy. Governments, concerned with keeping jobs alive in the fishing industry in the short-term, are essentially paying people to extinguish their own long-term job prospects – not to mention the effect on the next generation of fishermen. Artisanal fishing catches half the world’s fish, yet it provides 90% of the sector’s jobs.
Protect depletion
Clearly, industrialised countries are not about to return to traditional methods. However, the disastrous management of the industry needs to be reformed if we are to restore fisheries to a sustainable level. In the EU alone, restoring stocks would result in greater catches of an estimated 3.5 tonnes, worth £2.7 billion a year.
Rather than having a system in which the EU members each hustle for the biggest quotas – which are already set far beyond what is sustainable – fisheries experts suggest individual governments should set quotas based on stock levels in their surrounding waters. Fishermen should be given responsibility over the fish they hunt – they have a vested interest in seeing stocks improve, after all – and this could be in the form of individual tradable catch shares of the quotas. Such policies end the tragedy of the commons situation whereby everyone grabs as much as they can from the oceans before their rival nets the last fish, and it’s been used successfully in countries from Iceland to New Zealand to the US. Research shows that managing fisheries in this way means they are twice as likely to avoid collapse as open-access fisheries.
In severely depleted zones, the only way to restore stocks is by introducing protected reserves where all fishing is banned. In other areas, quota compliance needs to be properly monitored – fishing vessels could be licensed and fitted with tracking devices to ensure they don’t stray into illegal areas, spot-checks on fish could be carried out to ensure size and species, and fish could even be tagged, so that the authorities and consumers can ensure its sustainable source.
The other option is to take humanity’s usual method of dealing with food shortages, and move from hunter-gathering to farming.
Already, more than half of the fish we eat comes from farms – in China, it’s as high as 80% – but doing this on an industrial scale has its problems. Farms are stocked with wild fish, which must then be fed – larger fish like salmon and tuna eat as much as 20 times their weight in smaller fish like anchovies and herring. This has led to overfishing of these smaller fish, but if farmed fish are fed a vegetarian diet, they lack the prized omega-3 oils that make them nutritious, and they do not look or taste like the wild varieties. Scientists are working to create an artificial version of omega-3 – current synthetic omega-3 versions are derived from fish oils.
Fish farms are also highly polluting. They produce a slurry of toxic run-off – manure – which fertilises algae in the oceans, reducing the oxygen available to other species and creates dead zones. Scotland’s salmon-farming industry, for example, produces the same amount of nitrogen waste as the untreated sewage of 3.2 million people – over half the country’s population. As a result, there are campaigns to ban aquaculture from coastal areas.
Farmed fish are also breeding grounds for infection and parasites that kill off large proportions of fish – escapees then frequently infect wild populations. Farmers try to control infestations with antibiotics, but usually only succeed in creating a bigger problem of antibiotic resistance.
Read more from BBC News:
by Deep Green Resistance News Service | Apr 11, 2012 | Mining & Drilling, Toxification
By Karrie Gillett / Press Association
Sixty-nine oil and chemical spills in the North Sea have been reported in three months. Eighteen companies were named in a table published by the Department of Energy and Climate Change. The most recent incident was a gas leak at Total’s Elgin platform on 25 March.
Professor Andrew Watterson, the head of the occupational and environmental health research group at the University of Stirling, accused companies of playing down “the potentially catastrophic consequences” of gas and oil leaks. “These are very worrying figures that cannot be slicked over by government agencies and industry,” he said. He blamed “corporate failures” for polluting the sea, and pointed out that the number of reported chemical leaks had more than doubled since 2005.
Oil & Gas UK, which represents offshore companies, said the leaks were “relatively small” and many of the chemicals “benign”. BP and Shell were among the firms listed, with BP reporting the highest number of incidents at 23. Other companies included EnQuest, British Gas and Nexen.
From The Independent: http://www.independent.co.uk/environment/north-sea-spills-on-the-rise-7627548.html
