A Fish Built for One Specific World
Snow trout, members of the genus Schizothorax, are not a single species but a group of roughly 100 closely related species distributed across the cold rivers and streams of the Himalayan and Hindu Kush ranges. They evolved over millions of years in water that rarely climbs above 15°C. Their bodies reflect this precisely: a low metabolic rate calibrated for oxygen-rich, frigid water; scales reduced or absent on much of the belly to reduce drag in fast-moving currents; and a cartilaginous lower lip adapted for scraping algae and biofilm off submerged rocks. These are not generalist fish that happen to prefer cold water. They are cold-water specialists with almost no physiological room to adapt to warmth.
