So are deserts ... neither of which are especially relevant to whether or not the parts that produce most of the fish are being over taxed beyond replenishment rates or not.
This casual "the world has infinite resources to sustain unlimited human growth" is a bit 19th century and hasn't dated well.
Name a century without contrary characters and governments.
'LoL' and 'But Wat About' aren't considered responses.
Ocean resources are being depleted - it's simple enough to look up over fishing and a variety of reports on this from about the planet, not just direct overharvesting of fish, also reef destruction and other side effects from net dragging and industry that drive numbers down.
This casual "the world has infinite resources to sustain unlimited human growth" is a bit 19th century and hasn't dated well.