The series "Fish Physiology" recently celebrated its 50th Anniversary. In total, the editors of the series have produced a total of 47 books (several volumes have two books) that contain almost 500 chapters since the inaugural volume published in 1969. The content of the "Fish Physiology" volumes has evolved over time. The initial volumes were devoted to understanding the basic mechanisms and principles of fish physiology, with a focus on a few model species and some application to natural environmental conditions. Then, as the field better understood mechanisms, the approach was broadened to...