ABSTRACT
The relationship between life history and behaviour has been examined in fish although the intent of much of this work has been one of assessing how behaviour early in life influences some aspect of life history later in life. For example, Metcalfe et al. (1989) demonstrated that larger and behaviourally dominant juvenile Atlantic salmon generally migrate to sea, and possibly mature, earlier than smaller, subordinate individuals. Rather than ask how behaviour influences life history, I consider the changes in behaviour that might be expected to result from specific changes in life history. This approach shifts the emphasis from the behavioural aspects associated with foraging, territorial defence (as it relates to food acquisition), and predator avoidance to those associated with reproduction, e.g. selection of nest site, mate choice, and mate competition. Gross (1991) recently used such an approach to assess the conditional behavioural tactics employed by small, earlymaturing ("jack") and large, late-maturing ("hooknose") coho salmon, Oncorhynchus kisutch, during breeding.
