Would a perch first see or smell a predator approaching from distance?

A perch is more likely to detect a predator approaching from a distance through its keen vision rather than its sense of smell. Fish, including perch, have well-developed eyesight that allows them to spot movement and shapes in the water. While they can utilize their sense of smell for detecting food or danger at closer ranges, visual cues are crucial for early detection of predators. Thus, sight would typically be the first sense engaged in this scenario.