Fish swimming in two directions in RAS

In PAES W.A.T.E.R. Center, while the water is very clear in Tank E1 (due to withholding of feed for purging and harvest), notice the swimming patterns of the fish. On our Live Video Camera at http://paeswater.com/live-events.html , you see fish swimming in two directions. Looking down on the tank, there is a current being created by the incoming water in a clockwise direction. This current is common in well-designed RAS and helps to move solid waste to the center of the tank, where it can be removed at the drain. The upper layer of fish is swimming with the current (clockwise), while the group of fish nearer the bottom is swimming against the current (counter- or anti-clockwise). Fish behavior of swimming against the current is natural behavior, orienting themselves upstream so that they can benefit from any food being moved toward them by currents and flow. In Tank E1, fish swimming with the current are resting, expending less energy, as are those fish gathered near the center of the tank where the current is slower. If you watch for a while, you will notice fish changing direction, moving from one layer to the other.

Видео Fish swimming in two directions in RAS канала Pentair AES