Found in a thread on MetaFilter about the Central California Salmon collapse.
“[once upon a time there were] cod shoals “so thick by the shore that we hardly have been able to row a boat through them.” There were six- and seven-foot-long codfish weighing as much as 200 pounds. There were great banks of oysters as large as shoes. At low tide, children were sent to the shore to collect 10-, 15-, even 20-pound lobsters with hand rakes for use as bait or pig feed. Eight- to 12-foot sturgeon choked New England rivers, and salmon packed streams from the Hudson River to Hudson’s Bay. Herring, squid and capelin (a small open-water fish seven inches long) spawning runs were so gigantic they astonished observers for more than four centuries”