27-02-2012, 09:52 AM
sgd Wrote:does it make any sense that mackerels caught in these waters are sorted and exported to a factory to ground into feed and sold to maybe countries that farm salmon, sorting and exporting labor transportation all cost money. Maybe in those countries that farm salmon they buy locally caught mackerel then it makes more sense.
The NYT article I linked to makes clear that the waters off Chile are the main source of jack mackerel, and there a lot of the jack mackerel is used to feed the local salmon farming industry. Chile is the world's second largest producer of farmed salmon (Norway is #1 - 33%, Chile #2 - 31%).
Here's an article describing the history of the jack mackerel fishery and an ongoing dispute between Chile and Peru over overfishing:
http://digitaljournal.com/article/319260
Here is another article from The Santiago Times (a Chilean newspaper):
http://www.santiagotimes.cl/chile/enviro...low-levels
It quotes a Greenpeace study which found that jack mackerel stocks have declined by 90% in the last 20 years.
sgd Wrote:In my opnion there's actually a lot of fish still in the seas
Sure, there are plenty of fish in the sea, but all scientific data to date points to production (fishing) outstripping supply (reproduction) which means that it is only a matter of time before any particular fish stock becomes too scarce to commercially exploit. As technology improves that day draws ever nearer. It's like oil - we won't run out of oil, but we are running out of cheap oil. There will always be some oil too difficult or expensive to extract. Likewise, short of a nuclear holocaust there will always be some fish in the sea, but there may not be enough to matter commercially.
And of course it's not just overfishing - pollution is a huge problem. Not just plastic debris (which has resulted in some gigantic garbage piles in specific locations where the currents meet) but also chemical run-off from farming which has resulted in dead (low-oxygen) areas where only jellyfish survive. We may well see jellyfish becoming an important part of our diets in the next couple of decades. Am I an alarmist? No - just a realist who happens to read a fair bit.