What is the reason for large fish species disappearing from the oceans

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What is the reason for large fish species disappearing from the oceans

By Gaia Vince 21 September 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 Manlet 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 Only this week, a report suggested there may be fewer than cod over the age of 13 years in the North Sea between the United Kingdom and Scandinavia.

What is the reason for large fish species disappearing from the oceans

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.

BBC - Future - How the world’s oceans could be running out of fish Sunfish Mola mola The Mola mola is the biggest bony fish in our ocean waters, weighing in at up to a ton, or in rare cases in excess of that! There have been recorded cases of the sunfish having a weight in excess of kg and a length of 3 meters.
Consent Form | Outdoor Life Email The world faces the nightmare possibility of fishless oceans by without fundamental restructuring of the fishing industry, UN experts said Monday.

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. 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.

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. 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.

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.

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.

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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. 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.

Dangerous predator Humanity is not limiting its impacts to fish most commonly found on menus. Exotic sea creatures from turtles to manta ray to marine mammals are being hunted to extinction.

A decline in shark numbers has a significant impact on the marine ecosystem: Without the smallest creatures, the entire system is threatened. One of the repercussions, which I have discussed before, is an increase in jellyfish numbersbut overfishing, pollution, climate change and acidification also affect the marine ecosystem.

Warmer waters are pushing species into different habitats, causing some to die off and others to adapt by creating entirely new hybrid species.List of Biggest Fish in the Sea - Divetime is a community website for scuba divers to find resources, including general information, training, certification, sites & accessories The Beluga, also known as the European Sturgeon, is an extremely large species of anadromous fish which can be found in the Adriatic, Caspian and the Black Sea.

Jan 16,  · Scientific assessments of the oceans’ health are dogged by uncertainty: It’s much harder for researchers to judge the well-being of a species living underwater, over thousands of miles, than.

If, in fact, orcas are the reason why Chinook salmon size is decreasing, it raises a variety of questions about how these two species related in the past and what can be expected of salmon size and abundance in the future. Although the smaller-fish phenomenon cuts across most species in Alaska—“The big Kenai and Yukon River fish are largely gone,” confirms one state biologist—not all of Alaska’s wild salmon are imperiled.

9 Animals That Are On the Verge of Disappearing Forever. and they have extra-large paws to prevent them from sinking Found in the oceans of the Southern Hemisphere as well as the Pacific. The authors of the study, published this week in the journal PLOS One, said the disappearance of such big fish is the oceanic equivalent to the declining populations of pandas, elephants, and other large endangered terrestrial species.

What is the reason for large fish species disappearing from the oceans
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