Download - Assoc Prof David Crook - CDU
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EHSE SPG| 14 March 2016 | Slide 1
Research Institute for the Environment and Livelihoods
Building a new life history model for barramundi
Assoc Prof David Crook
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Building a new life history model for barramundi
David Crook
RIEL/School of EnvironmentKakadu Floodplain: Michael Lawrence-Taylor
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BARRAMUNDI LIFE HISTORY MODEL
Source: NT Fisheries
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OTOLITH CHEMISTRY
• 85 barramundi otoliths analysed
• 87Sr/86Sr core-to-edge transects, annual ageing
• Multi-collector laser ablation ICPMS (Uni of Melbourne)
• Compare otolith and water 87Sr/86Sr mixing model to make inference about ambient salinity
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87Sr
/86Sr
Salinity
Water mixing model – South Alligator River
0.708
0.712
0.716
0.720
0.724
0.728
0.732
0.736
0.740
0.744
0.748
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0
3-36 ppt
<1 ppt
1-3 ppt
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Barramundi (89 cm TL, female), Mary River estuary
87Sr
/ 8
6Sr
Distance from core (µm)
0.705
0.71
0.715
0.72
0.725
0.73
0.735
0.74
0 500 1000 1500 2000 2500
3-36 ppt
<1 ppt
1-3 ppt
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Barramundi (103 cm TL, female), Yellow Water
Distance from core (µm)
87Sr
/ 8
6Sr
0.705
0.71
0.715
0.72
0.725
0.73
0.735
0.74
0 200 400 600 800 1000 1200 1400 1600 1800
3-36 ppt
<1 ppt
1-3 ppt
Annual growth increments
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87Sr
/86Sr
Distance from core (µm)
Barramundi (122 cm TL, female), Mary River estuary
0.705
0.71
0.715
0.72
0.725
0.73
0.735
0.74
0 500 1000 1500 2000 2500 3000 3500
3-36 ppt
<1 ppt
1-3 ppt
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1) Estuarine
2) Catadromy, sequential hermaphrodism
3) Catadromy, delayed female spawning
Fresh waterSalt water
Eggs/larvae
Juvenile
Male
Female
Initial spawning
Fresh waterSalt water
Eggs/larvae
Juvenile
Male
MaleFemale
<3 years
residence
Fresh waterSalt water
Eggs/larvae
Juvenile
Female
Female
>3 years
residence
Male
Three strategy life history model for barramundi
From Crook et al. in prep.
THREE STRATEGY LIFE HISTORY MODEL
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• New life history model for barramundi
• Results used in 2016 ARC Future Fellowship application
• Results presented at:
– Water in the Bush Symposium, Australian Water Association, Darwin, October 2015.
– Australian Society for Fish Biology conference in Sydney, October 2015
• Invited paper in Marine and Freshwater Research
• PhD project on barramundi otolith chemistry and bio-chronology to commence this year
Acknowledgments:
EHSE Small Grants Scheme
Thor Saunders, Jon Taylor (NT Fisheries)
Jon Woodhead, Roland Maas (Uni of Melbourne)
Lachie Hetherington (CDU)
OUTCOMES