Summary of behaviours displayed during feeding trials.

<p>Mean duration (min) of behaviour states performed by Bay (a) and Tarwin (b) during each control and enrichment treatment. Similar behaviour states are grouped to show time spent performing: enrichment-related behaviours, pattern swimming, random swimming or any other behaviour state. Operational definitions for behaviour states are outlined in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0124615#pone.0124615.t002" target="_blank">Table 2</a>.