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

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Presentation on theme: "Diel Behaviour and Distributions of the Monocle Bream (Scolopsis bilineatus)"— Presentation transcript:

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 ( mm) Large Adults ( mm)

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= r=

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


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