One of the components of an upcoming aquaponics school project is the raising of fish, preferably endangered ones or of conservation value. This is a major project, and we have a 75 gallon tank. What are some good candidates for endangered fish we could be keeping? I am already thinking of either the Cichlid or Pupfish/killifish group. Preferably, we would like to either tie in the fish with a food crop we are growing in part of an aquaponics system, so they crop and fish be from the same region. So what species are recommended or would work best? Preferably they will not be too hard to keep or obtain, but ideally be endangered or in need of conservation.