Shark scientists attach a temperature logger to the dorsal fin of a newborn blacktip reef shark in the shallow waters just off Moorea, French Polynesia. "During fieldwork, the young sharks are captured with a gillnet, measured, tagged and released and some individuals received temperature loggers as seen in this photo," says photographer Tom Vierus. "These loggers will record the surrounding water temperature for as long as they are attached and once retrieved will aid the scientists in understanding how warming waters affect the physiology and ecology of young sharks."