Last week, 1.3 billion fish were released into the Yangtze River by the Chinese Ministry of Agriculture (MOA). The release took place in the provinces of Jiangxi, Hubei, Hunan, Anhui and Jiangsu in the middle and lower reaches of the river.

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After acknowledging the failure of current fishery policies within the union, EU officials are now considering banning the practice of discarding fish at sea.

“What’s the point of setting a quota if fishermen aren’t accountable for the fish they actually catch?” says Mogens Schou, a Danish fishery official.

The EU’s quotas limit the size of the annual catch that countries and their fleets can sell on their return to harbour, but instead of protecting remaining fishing populations from depletion, the system is making fishermen dump lower-value fish at sea to maximize profit. According to officials in the European Commission’s fisheries office, most of these fishes do not survive.

“To stay under their quotas, and make more money, fishermen discard half of what they catch,” says Schou, “They ‘high-grade’ – in other words, only keep the most profitable fish.”

Last month, an EU report was released highlighting the failure of current EU fishing regulations by showing that 88% of fish species in EU waters are being fished out faster than they can reproduce. In response to the report, fishery ministers from the 27 EU nations are currently discussing how to protect the remaining fish stocks from complete eradication.

As a part of these talks, Denmark has proposed an amended quota system where fishermen and their countries are held accountable for the amount of fish caught rather than the amount returned to port. To make it harder for fishing fleets to cheat, Denmark is also proposing that fishermen voluntarily equip their boats with on-board cameras. In exchange, the fishermen would get bigger quotas.

Denmark has already designed a surveillance kit consisting of four cameras, a GPS (Global Positioning System) device, and sensors that notice when fish is being hauled or dumped. The Danish kits are currently being used on six fishing boats with Danish officials monitoring the footage.

Danish fisherman Per Nielsen installed the kit on his trawler Kingfisher in September and believes it to be a good investment. The kit cost roughly 10,000 USD, but Nielsen was compensated by being allowed to catch several extra tens of thousands of dollars worth of cod.

As of now, EU fishermen throw overboard an estimated 50% of the fish they catch and did for instance dump 38% of the 24,000 tons of cod they caught last year, according to the International Council for the Exploration of the Sea.

The inclination to end up stuck on a hook seems to be a heritable trait in bass, according to a study published in a recent issue of the Transactions of the American Fisheries Society.

The study, which was carried out by researchers DP Philipp, SJ Cooke, JE Claussen, JB Koppelman, CD Suski, and DP Burkett, focused on Ridge Lake, an Illinois lake where catch-and-release fishing has been enforced and strictly regulated for decades. Each caught fish has been measured, tagged and then released back into the wild.

Picture by: Clinton & Charles Robertson from Del Rio, Texas & San Marcos, TX, USA

David Philipp and coauthors commenced their study in 1977, checking the prevalence of Largemouth bass (Micropterus salmoides) on the hooks of fishermen. After four years, the experimental lake was drained and 1,785 fish were collected. When checking the tags, Philipp and his team found that roughly 15 percent of the Largemouth bass population consisted of specimens that had never been caught. They also found out that certain other bass specimens had been caught over and over again.

To take the study one step further, the research team collected never caught bass specimens (so called Low Vulnerability, LV, specimens) and raised a line of LV offspring in separate brood ponds. Likewise, the team collected bass specimens caught at least four times (High Vulnerability, HV, specimens) and placed them in their own brooding ponds to create a HV line.

The first generation (F1) offspring from both lines where then marked and placed together in the same pond. During the summer season, anglers where allowed to visit the pond and practise catch-and-release, and records where kept of the number of times each fish was caught.

As the summer came to an end, HV fish caught three or more times where used to create a new line of HV offspring, while LV fish caught no more than once became the parents of a new LV line.

The second generation (F2) offspring went through the same procedure as their parents; they were market, released into the same pond, and subjected to anglers throughout the summer. In fall, scientists gathered the fish that had been caught at least three times or no more than once and placed them in separate ponds to create a third generation (F3) HV and LV fish.

A following series of controlled fishing experiments eventually showed that the vulnerability to angling of the HV line was greater than that of the LV line, and that the differences observed between the two lines increased across later generations.

If this is true not only for bass but for other fish species as well, heavy hook-and-line angling pressure in lakes and rivers may cause evolutionary changes in the fish populations found in such lakes. Hence, a lake visited by a lot of anglers each year may eventually develop fish populations highly suspicious of the fishermen’s lure.

More information can be found in the paper published in Transactions of the American Fisheries Society: Philipp, DP, SJ Cooke, JE Claussen, JB Koppelman, CD Suski and

DP Burkett (2009) Selection for vulnerability to angling in Largemouth Bass. Transactions of the American Fisheries Society 138, pp. 189–199.

This Thursday, the Anchorage-based North Pacific Fishery Management Council[1] approved an unprecedented plan to ban commercial fishing in the Arctic Ocean, as a part of their Arctic Fishery Management Plan. The council voted 11-0 in favour of the plan, which essentially bans all commercial fishing from the Canadian border down to the Bering Strait, and it is now up to the U.S. Commerce secretary to approve or reject the ban.

Before approving the ban, the North Pacific Fishery Management Council spent two years developing an Arctic Fishery Management Plan in response to global warming and the retreat of sea ice along Alaska’s northern coast. As of today, fishing is not carried out on any major scale in the Arctic Ocean, but commercially interesting species like crab and pollock may expand in this part of the sea and this could make the area attractive for fishing fleets. The council therefore decided to develop a plan in advance to be prepared for any future developments.

Environmentalists and fishing industry groups alike have praised the Arctic Plan, since both parties recognize the need to enforce strong management control over the Arctic Ocean. We still know very little about life in this remote part of the world and the few fish stock surveys that has been carried out in these waters has not managed to find any larger fish populations. The area could be opened up for regulated commercial fishing in the future, if more thorough research of the Arctic Ocean would show that sustainable fishing could be carried out without injuring the ecosystem.

“Climate change is having a significant effect on the Arctic, opening previously ice-covered waters and drawing cold-water species farther north,” says Dave Benton of the Alaskan Marine Conservation Alliance[2]. “The council’s action to close these waters as a precautionary measure gives us the opportunity to conduct the scientific review necessary to develop a plan for how sustainable fisheries might be conducted in the Arctic in the future.“

A Greater Weever (Trachinus draco) has been found in a stretch of the Thames estuary in Great Britain. The species, which is native to the Eastern Atlantic, the Mediterranean, and the Black Sea, is one of many signs of the improving health of the Thames estuary.

The weever was found after a two-year investigation carried out by the Environment Agency and Zoological Society of London and is the 60th new species found in the Thames since 2006. “The diversity and abundance of fish is an excellent indicator of the estuary’s health”, says Environment Agency Fishery Officer Emma Barton.

Flowing through London and several other urban areas, the Thames has a long history of being heavily polluted. In the so called ‘Great Stink’ of 1858, pollution in the river was so severe that sittings at the House of Commons at Westminister had to be abandoned.

So, should we fear this semi-new addition to the Thames estuary? No, there is no need to panic. This fish can deliver a very painful sting and should be handled with care, but the sting is rarely dangerous to humans – especially not if you seek medical attention.

The Greater Weever has venom glands attached to both of the spines on its first dorsal fin, and to the spines of the gill cover. The spines are equipped with grooves through which venom is driven up if the spines are pressed. A person that receives a sting from a Greater Weever can develop localized pain and swelling, and the result has – in a few rare cases – been fatal. Fortunately, there are several things you can do to make the situation less dangerous for a stung victim.

· If the wound bleeds, allow the wound to bleed freely (within reason of course) to expel as much venom as possible.

· Soak the affected limb in warm water because the toxin produced by the Greater Weever is sensitive to heat. There is no need use extremely hot water it and risk scalding the skin, because the toxin will deteriorate at a temperature of 40° C / 104° F.

· Seek medical attention.

The pain is normally at its most intense during the first two hours after being stung and even without treatment, the severe pain normally goes away within 24 hours. It is however possible for some pain to last for up to two weeks, and it is also possible for the spine to break off and get stuck inside the stung limb where it can continue to cause problems until it is removed.