Basically in the beginning of the season, salmon starts going up the river but not so many.
Naturally the middle to the latter, there are large number of salmon in the river.
サーモンは春の雪代とともに遡上を開始、以降どんどん川に溜まっていきます。
数で言えば、解禁当初より終了間際の方が断然多いわけですね。

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