@Jeroen89 there was a great story about #ShiftingBaselineSyndrome about a decade ago. A biologist reviewed photos from fishing expeditions in Key West over half a century. Charter boats that regularly brought in fish bigger than the tourists who caught them were, after some decades, only bringing in fish about 30cm long.
https://www.npr.org/sections/krulwich/2014/02/05/257046530/big-fish-stories-getting-littler