Mackerel fishing methods: walled channels and grate to catch spawning mackerel with the tide 47a; and fishermen in boats unfurling nets to encircle a school of mackered 47b. Painted mackerel; Scomberomorus regalis 48; and pilot fish; Naucrates ductor 49. Handcolored copperplate engraving after Jacob Nilson from Gottlieb Tobias Wilhelm's Encyclopedia of Natural History: Fish; Augsburg; 1804. Wilhelm (1758-1811) was a Bavarian clergyman and naturalist known as the German Buffon.