[devons]

Interesting - do you know if the negative effects of circular swimming pool affect fish hatcheries? (fish are forced to swim against current)

If I had to guess, I'd say not as much b/c of the size of the fish.

[oflannabhra]

Most fish farms force fish to swim through a current of running water. I think most are concrete “runs” that continuously pump water through. At least what I’ve seen in the US is that way. There are now many overseas fish farms.