It appears that stocks of fish that make migrations between rivers and the sea have declined by 76% in the last 50 years (https://www.theguardian.com/environment/2020/jul/27/migratory-river-fish-populations-plunge-76-in-past-50-years). This includes salmon and eels, fish that are important foods for many mammals and birds. One would have hoped that the rivers the fish return to breed in, would have got cleaner over that period so something else (over fishing, parasites from fish farms?) must be decimating the populations.
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