By Patrick Love

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Extra info for Fisheries: While Stocks Last (OECD Insights)

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Measurements show that the ocean has been absorbing more than 80% of the heat added to the climate system. Water expands when it is heated, contributing to sea-level rise. 1 mm/year) from 1993 to 2003. It isn’t clear whether the faster rate over these 10 years is due to an increase in the longer-term trend, but what is clear is that the rate of observed sea-level rise increased from the 19th to the 20th centuries, and in the tropics, unusually high sea surface water temperatures are becoming increasingly frequent.

The real economic importance of recreational fishing is hard to estimate since many countries do not collect detailed information. Moreover, some of the money spent on fishing may not show up in the data, for instance money spent 40 OECD Insights: Fisheries 3. Fisheries: Taking Stock on fuel to get to a fishing destination, or on a hotel on the way. National surveys that do exist show how popular recreational fishing is, and give some idea of its financial impact. Sports fishing is more important economically than commercial fishing in many countries.

5 to 5 kilos of wild fish to produce a kilo of farmed salmon, shrimp or other fish, and 20 kilos of wild fish are needed to produce a kilo of farmed tuna. Aquaculture now uses 59% of global fishmeal stocks and 80% of fish oil. Not all of this feed gets eaten. The leftovers mix with excreta and dead fish near the cages, reducing biodiversity and sometimes causing algal blooms. The mix can also include medicines such as antibiotics needed to control diseases. Farmed fish are more vulnerable than wild ones and they can pass on some of their vulnerability to wild stocks through interbreeding (in 2006 over 900 000 escaped in Norway alone according to the Norwegian Fisheries Directorate, although this was an exceptionally bad year).

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