Effects of senescence and density on the aggression of adult female sockeye salmon

Abstract

Aggression of individual female sockeye salmon Oncorhynchus nerka in Hansen Creek, Alaska, was unrelated to body size or density but it decreased over the last 7 days of life from an average of 8·89–1·47 counts 15 min−1. In addition, as females neared death they tended to use less violent forms of aggression.