The standardised residuals after fitting the main effects models are useful for interpreting how the activity patterns depend on size, time of day, and depth. A large positive residual indicates more starfish than expected given independence of the main effects, whereas a large negative residual represents less starfish than expected. The row profiles can be used to assessed similarities in patterns of activities at the different depths for the different sizes of starfish at different times of day. Small starfish (,25 cm) have a strong tendency to be stationary during the day and feed at night; this pattern being similar for both depths (Table 8). For both day and night, and both depths, all residuals for moving activity are negative indicating that small starfish spend less time in motion than larger starfish (.25 cm), which move predominantly during the day at depths .3 m. The pattern of feeding and stationary behaviours for medium size starfish (25–40 cm) is opposite to that of small starfish, with feeding taking place more often during the day, and stationary behaviour taking place more often at night. The row profiles across size and depth reflect this complementary behaviour, with the profile for small starfish during the day being similar to the profile for medium sized starfish during the night. Similarly the profile for small starfish during the night is similar to that of medium starfish during the day. The stationary behaviour of medium sized starfish is particularly prevalent at shallow depths (,3 m) during the night. For large starfish (.40 cm) the residuals are all positive during the day at depths .3 m, and are all negative for the day at depths ,3 m and for the night at all depths. This indicates that large starfish comprise a larger proportion of the overall population during the day at depths .3 m relative to all other times and depths, irrespective of activity. In particular there is a strong tendency for them to feed and be on the move at depths .3 m during the day.