Classic trout fishermen typically throw very small flys. The reason they can do it is that trout are sight feeders and their vision is very acute. Conditions dictate that fisherman to use certain flys. Just because anglers prefer to use dry flys because it is more fun it is not the only option. Their eyes are mid-range. That means they are comfortable looking up for food as well as down making them multi-directional feeders.
Trout in the wild prefer cold moving water over a rocky bottom. They can survive in the still water of a pond but on a more limited basis. The ideal water temperature for trout is in the 40 to 55-degree range. This can vary by sub-species.
On rivers where water levels change during the day, they survive through adaptation. When the current is fast, they will be near the edges of the river system. As water levels lower and current decreases they will go more toward the middle or they will range the river system.
Their relating to structure is to conserve energy and preserve calories.
A trout has a lateral line like all fish. He responds to movement, vibration and sound. The lateral line allows him to pinpoint a direction from which those things emanate. He then moves toward that sound and then uses sight to zero in on it.
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