A report by the WWF has suggested that stocks of tuna and mackerel in the seas have recently declined by 74% (http://www.theguardian.com/environment/2015/sep/15/tuna-and-mackerel-populations-suffer-catastrophic-74-decline-research-shows). Many other marine species, including Leatherback turtles and Sea cucumbers, are also in apparently terminal decline. Over-fishing is part of the problem but pollution also plays a role. We really need to manage what we do to the seas more effectively but that is going to be very difficult with increasing human populations and changing demands.
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