瑜伽論記 16.381

16.381

下辨海鹹，由水鹹故至不被採害者，謂由水鹹陸居眾生不得入水採害，則水居蛇難，是水居者有福。

Below, it determines the saltiness of the sea: From 'because the water is salty' up to 'not being harvested and harmed' means: because the water is salty, land-dwelling sentient beings cannot enter the water to harvest and harm them; thus, water-dwelling creatures avoid harm, which is the merit of water-dwellers.