Mackerel illustration. The original caption read:
Fig. 605. -- Scomber scombrus, mackerel.
Date 25 June 2007
Source Richard Hertwig (1909) A Manual of Zoology, New York: Henry Holt and Company, pp. p. 577
Author Richard Hertwig
Source: https://commons.wikimedia.org/wiki/File:Scomber_scombrus_illustration.png

The Atlantic mackerel (Scomber scombrus) is a pelagic schooling species of mackerel found in the Mediterranean Sea, the Black Sea, and the north Atlantic Ocean. Scomber scombrus is also known as Boston mackerel, Norwegian mackerel, Scottish mackerel or just mackerel.