Naming. This record documents Snook; the reviewed band was published under Common snook. Worth knowing before you lean on the numbers — the closer a name is to a regional one or a subspecies, the more the band is a reasonable neighbour rather than the same fish.
What the edges are. Cold edge: feeding ceases (14.4–16.1 °C); death follows near 47–49 °F. No warm edge published. These are not one consistent quantity across species. A measured avoidance temperature is where fish were seen leaving; a water-quality maximum is a regulatory ceiling written to prevent a kill, and it sits well above the point a day gets difficult.
Source. Fore, P.L. & T.W. Schmidt 1983, Species profiles (South Florida) — snook, U.S. Fish and Wildlife Service FWS/OBS-82/11.16; cold tolerance from Hall-Scharf, B.J., Q.M. Tuckett, P.W. Stevens & J.E. Hill 2025, Estuaries and Coasts 48(2). Read it.
Warmwater species swing their preference ten degrees or more between winter and summer in the same laboratory. One band per species is a summer simplification, and it is why the drawing shows a band rather than a line.