Hi all, we have three classrooms with trout. In two of them, there are only a handful of living trout left. In the last classroom, we have a good twenty or so. My theory is that the other two tanks has gravel as well as larger rocks and the third tank has gravel and small golf-ball or smaller sized rocks. When searching for living alevin, I found that many had gotten stuck under the rocks and died. On the TIC website, most people have a hatching basket that the eggs and alevin are in until they can swim out on their own. I’m theorizing that this may be the problem we are having. So, I have since removed all rocks except the gravel and will see what results we have. Just a suggestion for others. Keep your finger(lings) crossed!!!!