Short clip of a female brook trout preparing her redd(spawning bed). The video shows her testing the depth of the potential egg pocket by probing with her anal fin (first bottom fin in front of the tail) and the width of the egg pocket by rocking her anal fin side to side. Toward the end of clip she tries to improve the egg pocket by swiftly turning on her side and sweeping. She will not lay any eggs until she is completely satisfied and can be seen doing this for quite some time. Also note that the dominant male,her chosen mate, is constantly protecting her and the redd from other male intrusions, chasing, displaying, pushing and sometimes biting them. This video was collected on the Bois Brule River, a Wisconsin stream flowing into Lake Superior.