When choosing a sinking fly line for different depths, it's essential to consider the sink rate of the line. Sink rates are typically classified as slow, medium, fast, and extra fast. For shallow depths, a slow sinking line (1-2 inches per second) is suitable. For moderate depths, a medium sinking line (2-4 inches per second) works well. Deeper waters require a fast sinking line (4-6 inches per second), while extra fast sinking lines (6+ inches per second) are ideal for fishing in very deep waters. Additionally, the type of fly and fishing conditions will also influence your choice. Experimenting with different sink rates and adjusting based on the fishing spot's depth will help you find the right sinking fly line for the situation.

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Topics covered in this question:

Fishing Tips Sink Rate Depths Sinking Fly Line