Essential Fish Biology: Diversity, Structure, and Function. By Derek Burton and Margaret Burton. Oxford and New York: Oxford University Press. $105.00 (hardcover); $55.00 (paper). xix + 417 p. + 16 pl.; ill.; index. ISBN: 978-0-19-878555-2 (hc); 978-0-19-878556-9 (pb). 2018.