Threat 1: OVERFISHING

By PSU EcoMerge Capstone - 10:21 AM


THREAT 1: OVERFISHING!

One in five people on this planet depends on fish as the primary source of protein.—Food and Agriculture Organization
"We are in the situation where 40 years down the line we, effectively, are out of fish."—Pavan Sukhdev, UN Environment Programme

Overview

Overfishing occurs when fish and other marine species are caught faster than they can reproduce. It is the result of growing demand for seafood around the world, combined with poor management of fisheries and the development of new, more effective fishing techniques. If left unchecked, it will destroy the marine ecosystem and jeopardise the food security of more than a billion people for whom fish are a primary source of protein.

Sustainable fishing

The statistics are grim: 3/4 of the world's fish stocks are being harvested faster than they can reproduce. Eighty percent are already fully exploited or in decline. Ninety percent of all large predatory fish – including tuna, sharks, swordfish, cod and halibut – are gone. Scientists predict that if current trends continue, world food fisheries could collapse entirely by 2050.1
The most prized species are already disappearing. The 1990s saw the widely-publicised collapse of several major cod fisheries, which have failed to recover even after fishing was stopped. WWF predicts that the breeding population of Atlantic bluefin tuna — one of the ocean's largest and fastest predators, and sought-after as a delicacy used for sushi — will disappear within three years unless catches are drastically reduced.
Tune decline infographic

CASE STUDY: ATLANTIC BLUEFIN TUNA

They can weigh over half a ton, grow to over four metres in length, and dive to depths of 1,000 metres. They accelerate as fast as a sports car and reach speeds of 70 km/h, propelled by a rapidly vibrating, whip-thin tail. They even raise their body temperature far above that of the surrounding water in order to traverse frigid arctic waters.
Bluefin tuna are unique, perfectly-adapted products of evolution. They are also dangerously close to becoming extinct.
Coveted for their dense, dark red meat used in sushi (where it is known as “toro”), bluefin support an unsustainable $7.2 billion industry that has driven tuna stocks to the brink of collapse. In 2009, WWF predicted that without drastic measures, Atlantic bluefin will disappear by 2012. Unfortunately, attempts to implement such measures – most recently at the 2010 Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) – have failed.
As fish populations closer to shore dwindle, commercial fishing operations have shifted their focus to largely unregulated deep-sea fisheries – as much as 40 percent of the world's trawling grounds are now in waters deeper than 200 meters. In doing so, they target species which are particularly vulnerable to overexploitation, like the orange roughy. Like many other deep-sea fish, this species matures late and lives very long — over 150 years. Its low fecundity means populations become depleted more quickly than inshore species when they are overfished, and take much longer to recover. Indeed, many orange roughy stocks have already collapsed, and recently discovered substitute stocks are also rapidly dwindling.
The good news is that areas with competent fisheries management and coast guard policing, mainly in the developed world, have experienced some dramatic recoveries of fish populations. The bad news is that most overfishing takes place in the waters of poor countries where there is no adequate regulation or policing; areas where rogue fleets — some of which hail from developed countries — equipped with high-tech ships can poach without consequences. Using methods like bottom trawling and long-lining, these fleets are capable of wiping out entire fisheries in a single season. And they don't just catch the fish they target.
To continue reading please visit the following URL:
http://saveourseas.com/threats/overfishing

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