I was browsing for a salt document and I found a web site with someone who should know better, recommending that people salt their ponds all the time, to maintain a moderate 0.1% solution of salt all the time.
Not a good idea.
Fish and plants don’t ‘thrive’ that way. Your fish could be doing “okay” with salt all-the-time, but they’d be doing better and more vigorously without it. Besides, parasites get used to it.