Sinking lines can also be a subjsct of controversy.
If you are fishing from the bank, with weighted flies, you don't need a sinking line, as the weighted nymphs will get down quicker than any line.
The issue comes in, when boat fishing drifts, with the wind, and you are planning to fish with the line sink rate, and not the fly weight. In strong wind, with a faster drift, the faster sinking line will get to the required depth quicker. You don't want to be in the situation where you drift over the line before it has reached your countdown depth. Intermediates are also good for shallow sub surface fishing in strong wind, so the chop of the water does not disrupt the movement of the fly, which would happen if using a floater.
If you. Retrieve speeds are also a valid concern with sinking lines, as you will be able to hold a fly at a particular depth for longer with a slow retrieve on a slower sinking line. Faster sinking lines require fast retrieves to keep a required depth, otherwise the line tends to sink below the required depth if you retrieve too slow. So, a good basic rule of thumb, is fast retrieve, faster sinker, slower retrieve slower sinker. If you are going to be drift boat fishing, be prepared to make several line changes until you find the feeding depth of the fish, so a DI 3, DI5, DI7, slow intermediate DI1,5, should serve all puposses. If you want to get extreme get a DI 7 as well.
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