Amazing exhibit! I see four manatees on this photo, do you know the total number? The enclosure in the Zoo at my visit in 2002 was already quite spacious compared to the ones at that time in Europe (Artis, TP Berlin), but this seems the next level.
The manatees were getting fed at the time of taking this picture. I guess most of them were near the waters surface on the top left corner of this picture. Though I didn't count, I guess there were around 14 adults and 2 youngsters. I do agree with this being an amazing exhibit! And as it was really quiet during my visit, I had the whole exhibit virtually for myself.
@AWP If I remember it holds roughly 2 million liters of water, which makes the tank quite full of manatees given the large number the hold. As a comparison the tank in Nuremberg is 700.000 liters and the ones in Beauval and Burgers' Zoo roughly 1 million liters.