These excellent antique prints of fish are by Heinrich Rudolph Schinz (1777-1861), a Swiss physician and naturalist.
From 1833 to 1855 he was also professor of zoology at the university of Zurich. He created many important zoological works.
These included Naturschichte und Abbildungen der Fische (Natural History and Pictures of Fishes). Its beautiful lithographs were by Karl Brodtmann.
Here are some of the best for you to choose from. They are genuine antiques from 1836 and have hand painted colours.