Tag: Fish

Biological oxygen demand - BOD: 1976-2008
The availability of oxygen is one of the most important indicators of the condition of a water body, because dissolved oxygen, or DO, (the amount of oxygen dissolved in water) is necessary for most aquatic organisms, inc...
26 Jan 2009 - by Phillippe Rekacewicz, February 2006
The WWF living planet index for freshwater
'The over-exploitation and mismanagement of fisheries, particularly when combined with other man-made stresses, can lead to the collapse of regional fish faunas. In many countries, aquaculture is rapidly increasing in re...
26 Jan 2009 - by GRID-Arendal
Damming the world
The construction of large dams - defined as those with walls at least 15 metres high - has increased significantly over the past 50 years. The average height of new dams, estimated at 30-34 m from 1940-1990, increased to...
26 Jan 2009 - by Phillippe Rekacewicz, February 2006
Industrial areas and seasonal zones of oxygen depleted waters
This graphic illustrates the strong link between areas with high densities of industrial activity and zones of seasonally oxygen-depleted waters. There is a strong link between areas with high densities of industrial ac...
26 Jan 2009 - by Phillipe Rekacewicz, (Le Monde diplomatique) February 2008
Fish Catch
The worlds most productive fishing grounds are confined to major hotspots in around 7.5% of the ocean surface, where over half of the fish are caught.
06 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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