Crayfish aggression and the androgenic gland in a behavior lab for non-majors

Male Procambarus clarkii were matched by size and largest claw length and observed interacting in pair matches before and after removal of the androgenic gland or a sham operation. Although results were not significant, trends suggested that males showed less aggression after the removal of the androgenic gland. Average bout duration did not decrease, but mean intensity of interaction decreased. This exercise was part of a student lab for non-majors. Students were positive about the lab, indicating that they learned about quantifying behavior, about hormonal involvement in aggression, and that the lab made them want to do more science.