When the water rises and the temperature is low, heavier fly line is useful.
Because we want to drift the fly more gently.
急に増水してしかも水温が低い時、タイプVI(6)の出番が多くなります。
やっぱり沈めないとダメなのか・・って?
いいえ、フライをゆっくりと泳がせたいからです。

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