Interestingly enough, intraspecific aggression was my primary response variable during my research. I looked at changes in aggression within cohorts of three fish under varied conditions of sedimentation, water temperature, and time of day. Turns out that if you give them places to hide, aggression can be well mediated. During my research, the only available habitat to hide in was the interstitial space in the streambed, until the sedimentation cut that off as well. After watching these fish and recording data for a ridiculous number of hours, I was pretty familiar with my fish and able to select compatible individuals and I have provided ample habitat, so I have not had aggression issues at home. Their dominance hierarchy is extreemly rigid, and typically follows a size ranking. In the 180 gallon at school I started with 4 fish, each one the most dominant within their previous cohort of 3. The smallest of the 4 dominant fish had to be removed from the 180 (and came home to my 125, she was "G", the fish that just passed due to egg lock). At home she was once again the too ranking fish, and maintained the optimum feeding location nearly exclusively. It was her surrender of this location in the tank that alerted me to an issue, which I was too slow in resolving...
Meanwhile, "P" is the largest of the 3 remaining dominant fish in the 180 at school, and he is an amazingly beautiful 10"+ male who has effectively consumed every minnow I once had in the tank with him. The other two trout in the 180 are still doing well, although they are significantly smaller than bossman "P". His is a picture of him taken just now.
