Mullet movement inthe Mary catchment• Recap on the mullet species• Where are they in the freshwater?• What affects their m...
Mullets of the MarySpecies River Estuary CoastalFreshwater mullet Myxuspetardi√ √ √Sea mullet Mugil cephalus √ √ √Flat-tai...
Sea mullet• Snout short and rounded• Andipose eyelid present• Silvery bluish dorsalcolour• Axillary process at top ofpecto...
Where arethey?Official mullet recordsConondaleGympieMaryborough
Mullet movement in the Mary• Both Sea Mullet and Freshwater Mulletmigrate out of the freshwater to breed– Sea Mullet in wi...
Case study of improved fishpassage• Mary River Barrage– built 1982– 59.2 km upstream ofMaryborough• Fishway upgrade 2001- ...
BEFOREAFTER
Improved fish passage• Improved design:– Increased daily passage of fish by 97%– Species increased from 8 (~12) to 32– Fre...
Selection of species observedSpecies SuccessfullyMigrating upSize RangeSea Mullet 2,694 21-473 mmFreshwater Mullet 55 300-...
Remaining infrastructure withouteffective fish passage devices• Tallegalla Weir• Imbil Weir• Borumba dam• Baroon Pocket da...
Mullet and their movements in the Mary
Mullet and their movements in the Mary
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Mullet and their movements in the Mary

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Freshwater mullet are one of the species that are the focus of the Mary River Threatened Species Recovery Plan.
They are in decline, though the Mary is one place they still occur.

Presentation given at the April MRCCC meeting.

Published in: Education, Design, Business
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Mullet and their movements in the Mary

  1. 1. Mullet movement inthe Mary catchment• Recap on the mullet species• Where are they in the freshwater?• What affects their movement?– Case study of the Mary River Barrage fishpassage upgrade
  2. 2. Mullets of the MarySpecies River Estuary CoastalFreshwater mullet Myxuspetardi√ √ √Sea mullet Mugil cephalus √ √ √Flat-tail mullet Liza argentea Likely (young only) √ √Green-backed mullet LizasubviridisLikely (young only) √ √Sand mullet Myxus elongatus Likely (young only) √ √Fantail mullet Valamugil georgii Likely (young only) √ √
  3. 3. Sea mullet• Snout short and rounded• Andipose eyelid present• Silvery bluish dorsalcolour• Axillary process at top ofpectoral finFreshwater mullet• Snout pointed and longerthan eye diameter• No eyelid• Olive green dorsal colour• No axillary process at topof pectoral finAxillary processEyelid
  4. 4. Where arethey?Official mullet recordsConondaleGympieMaryborough
  5. 5. Mullet movement in the Mary• Both Sea Mullet and Freshwater Mulletmigrate out of the freshwater to breed– Sea Mullet in winter– Freshwater Mullet in summer to autumn• Both return to freshwater as juveniles• Barriers effect their ability to move, breedand survive• The freshwater mullet are most vulnerable
  6. 6. Case study of improved fishpassage• Mary River Barrage– built 1982– 59.2 km upstream ofMaryborough• Fishway upgrade 2001- was pool and weir design- converted to vertical slot fishway-Study by A.P Berghuis and S.A Piltz (2002-2003)
  7. 7. BEFOREAFTER
  8. 8. Improved fish passage• Improved design:– Increased daily passage of fish by 97%– Species increased from 8 (~12) to 32– Freshwater mullet were recorded using the newdesignMaximum number of fish successfullymigrating upstream in one day?50, 895!
  9. 9. Selection of species observedSpecies SuccessfullyMigrating upSize RangeSea Mullet 2,694 21-473 mmFreshwater Mullet 55 300-510 mmBony herring (bony bream) 17,321 16-362 mmBlue catfish 6,729 57-625 mmEstuary Perchlet 922 17-84 mmLong-finned eel 120 330-1300 mmYellow-finned bream 44 53-379 mmAustralian Bass 18 222-428 mmBarramundi 9 97-216 mm56 sampling days, based on large fish trip only
  10. 10. Remaining infrastructure withouteffective fish passage devices• Tallegalla Weir• Imbil Weir• Borumba dam• Baroon Pocket dam• Cedar Pocket dam• Gympie Weir Fish ladder on Tallegalla Weir– ineffective for native fish,includingFreshwater mulletPhoto: Stephen Howell

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