Rising wealth in Asia and fishing subsidies are among factors driving overexploitation of the world's fish resources, while fish habitat is being destroyed by pollution and climate change, UN marine experts said last week.
According to the UN Environment Programme, up to 32 percent of the world's fish stocks are overexploited, depleted or recovering, they warned. Up to half of the world's mangrove forests and a fifth of coral reefs that are fish spawning grounds have been destroyed, the organisation says, recommending less-destructive ways of fishing that use more labour and less energy to help restore the health of the world's oceans and coasts.
The agency was leading a five-day conference in Manila of experts and officials from 70 governments.
Jacqueline Alder, head of UNEP's marine, coastal and freshwater office, said the increasing ranks of rich Asians are driving demand for better quality fish that are often not abundant, adding pressure to their supply.
Alder said booming population, more awareness of health benefits from eating fish, fuel and boat-building subsidies in industrial fisheries, weak management and limited understanding of ecosystems' values are also driving fish overexploitation.
She said subsidies should be reduced or eliminated, fishing gears should be less destructive, and the number of boats and fishers reduced. Habitat management should also be strengthened and marine protected areas established.
Fish is the main source of protein for up to 20 percent of the of world's population and some 180 million people are directly or indirectly employed by the fishing industry, she added.
Vincent Sweeney, UNEP's coordinator for the Global Program of Action to prevent marine environment degradation from land-based pollutants, said up to 90 percent of sewage in developing countries is discharged untreated into rivers, lakes and oceans, posing one of the most serious threats to water resources.
Other pollutants from land including nitrogen and phosphorous from fertilizers and detergents result in hypoxia or 'dead zones' where too many nutrients cause an undesirable growth of plants that compete with coral reef and other marine life for oxygen.
More at www.unep.org