1. Diel Behaviour and Distributions of the Monocle Bream (Scolopsis bilineatus)

2. Nemipterids- the forgotten fishes

3. Diel feeding patterns: Stomach Volumes Change in feeding strategy over life cycle- diurnal nocturnal feeding Orpheus Island (n=99) One Tree Island (n=113) Dawn Mid-dayDusk DawnMid-dayDusk Mean Stomach Volume Juveniles (<120mm) Small Adults (120-160mm) Large Adults (160-200mm)

4. Using Observations

5. Number of Bites per 10 minutes Total Length (mm) Orpheus Island One Tree Island Diel Feeding Patterns: Daytime Feeding rates Observations: feeding rate in daytime r= -0.826 r= -0.697

6. Diurnal/ Nocturnal Distributions Diurnal/ Nocturnal Distributions REEF CREST Patch reef 10m 5m SAND 15m 30m Methods Created a fine scale map of reef section Surveyed 3x during the day 3x at night Hypothesis Distributions and habitat use may differ between day and night

7. Diurnal/ Nocturnal Distributions DAY (n=15) REEF CREST Patch reef 10m 5m SAND 15m 30m

8. Data pooled for n=3 nights Diurnal/ Nocturnal Distributions DAY (n=15) NIGHT ( n=13 ) REEF CREST Patch reef 10m 5m SAND 15m 30m Adults moved away from reef and onto sand at night.

9. Implications Size matters! Diel feeding patterns differed with age and growth A demographic perspective is essential Shelter sites are important Adult fish dependent on shelter microhabitats (with site fidelity) Diurnal/nocturnal distributions differed Highlights importance of nocturnal surveys Nocturnal fishes likely to be overlooked/underestimated historically Nocturnal feeders form important trophic links Abundant nocturnal feeders such as Scolopsis bilineatus may play important roles in energy and nutrient cycling