Wed, Sep 23, 2015 - Page 9 News List

Risk to seas manageable by adding to number of protected zones

A study released last week found that the amount of wildlife in the oceans has fallen by half in 45 years. An expert says the decline could be reversed by closing areas to fishing

By Callum Roberts  /  The Guardian

Illustration: Mountain People

Sardines were once extraordinarily abundant in waters off the southwest England coast, leading one 19th-century guidebook to say: “Pursued by predaceous hordes of dogfish, hake and cod, and greedy flocks of seabirds, they advance towards the land in such amazing numbers as actually to impede the passage of vessels and to discolour the sea as far as the eye can reach.

“Of a sudden they will vanish from view and then again approach the coast in such compact order and overwhelming force that numbers will be pushed ashore by the moving hosts in the rear. In 1836 a shoal extended in a compact body from Fowey to the Land’s End, a distance of at least 100 miles [161km], if we take into consideration the windings of the shore,” the Handbook for Travellers in Devon and Cornwall by John Murray and Thomas Clifton Paris says.

Today, people travel thousands of kilometers to dive and film such scenes, not realizing they were once commonplace off the UK’s own coasts.

Last week, the WWF and the Zoological Society of London issued their most comprehensive look at the state of life in the sea. The report makes uncomfortable reading. Taking in more than 1,000 species worldwide and 5,000 populations of fish, turtles, marine mammals and a host of others, it draws the bleak conclusion that there is only half the amount of wildlife in the sea today as in 1970.

Although 1970 is their baseline year and seems long ago, life in the sea has been in decline for much longer. In short, that means the picture is worse than the report suggests. The waters around Britain demonstrate the same patterns that are slashing fish stocks around the world.

The first well-documented herring fishery collapse around the UK was off East Anglia in the mid-1950s, followed by one in Scotland’s Firth of Clyde in the 1960s. An abundance of small fish attracted the attention of larger creatures. Fishermen found the great herring shoals by following the “signs” of those better able to search for them — seabirds raining attacks from the sky, blowing whales, leaping dolphins, the thrashing of thresher shark tails. There was always a frenzy somewhere along the coast. The seas of the early 19th century and before had an exuberance of life that is hard to comprehend today.

Huge fish also prowled the seabed. Common skate and halibut meters long and weighing 50kg or more were present in enormous numbers. Early photographs of fish markets across the UK show these fish covering the floor like great paving stones. Pictures of seaside towns show cod, ling and hake each more than a meter long laid out for sale after being caught from small boats within a few kilometers of the shore.

There was a much greater diversity of large creatures in catches then. Animals such as wolffish, with their striped and spotted flanks, lurked in caves and rock piles. Conger eels were abundant. A cartoon view of the conger eel is of a toothsome beast whose eyes twinkle from the portholes of sunken ships. The reason that wreck fishing is one of the most popular forms of sea angling is that these places are avoided by bottom trawlers, giving them de facto protection. Where trawling occurs, congers are scarce.

It was bottom trawling that led to decline. Trawlers catch fish by dragging their nets over the seabed. It is not hard to imagine the damage this did to the great fields of invertebrates that lived on the bottom, including corals, sponges, seafans, sea nettles, oysters and hundreds of others.

This story has been viewed 2018 times.

Comments will be moderated. Keep comments relevant to the article. Remarks containing abusive and obscene language, personal attacks of any kind or promotion will be removed and the user banned. Final decision will be at the discretion of the Taipei Times.

TOP top