Originally Posted By: Jim Wetzel
Fish in top group are doing something really bad. They are extras so not on top of them like we should be. Students are being tasked with observing to see what is going on. If you have experience raising lots of chicks in small pens you can sometimes see similar and it is also bad there as well.

Fish in lower image are in a polarized school that has an edge. I like to present the feed at the edge they are facing towards.


What is the bad thing? Piling up on top of each other?