t s2 a1 hourston bird - international riversymposium title: microsoft powerpoint -...
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Native and feral fish distribution i l d l k d tl d f thin enclosed lakes and wetlands of the
southern Swan Coastal Plain
Mathew Hourston & Chris BirdDepartment of Fisheries W.A.,
Australia
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YanchepStudy area
Perth
Enclosed water bodies
“N ti fi h”“Native fish”Finfish that naturally occur in theoccur in the water bodies of the catchments of the study area.
Busselton
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Mapped perennial tl d
Perennial wetlands 2008
wetlands
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Perennial wetlands 2008Look as though th t i t May have water 1019 (50%)they contain water
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Look as though th t i t
Perennial wetlands 2008
they contain water May have water 1019
Likely to have water 806
(50%)
(40%)
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Look as though th t i t
Perennial wetlands 2008
they contain water May have water 1019
Likely to have water 806
(50%)
(40%)
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Wetlands that werei it d i th fi ld
Perennial wetlands 2008
visited in the field May have water 1019
Likely to have water 806
(50%)
(40%)
Visited in the field 366
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Perennial wetlands 2008Lakes visited that
t i d t May have water 1019
Likely to have water 806
(50%)
(40%)
contained water
Visited in the field 366
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Accessible lakes th t t i d t
Perennial wetlands 2008
that contained water May have water 1019
Likely to have water 806
(50%)
(40%)
Visited in the field 366
Sampled wetlands 114
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Perennial wetlands 2008Accessible lakes th t t i d t May have water 1019
Likely to have water 806
(50%)
(40%)
that contained water
Visited in the field 366
Sampled wetlands 114
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Fish were caughtPerennial wetlands 2008
May have water 1019
Likely to have water 806
(50%)
(40%)
Visited in the field 366
Sampled wetlands 114
Fish present 88 (77%)
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Native freshwater fishPerennial wetlands 2008
May have water 1019
Likely to have water 806
(50%)
(40%)
Visited in the field 366
Sampled wetlands 114Western minnow
Swan River gobyPseudogobius olorum
23
= 32
Fish present
Native fish presentWestern pygmy perchEdelia vittata
Western minnowGalaxias occidentalis
= 23
= 10
88
50
(77%)
(44%)Edelia vittata
NightfishBostokia porosa = 8
Western hardyheadLeptatherina wallacei = 4
Black-stripe minnow 1Black stripe minnowGalaxiella nigrostriata = 1
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Western pygmy perch
Western minnow
NightfishNightfish
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Swan River goby
David Morgan
Western hardyhead
David M
Black-stripeminnow
Morgan
minnow
Mark Allen
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Feral freshwater fishPerennial wetlands 2008
May have water 1019
Likely to have water 806
(50%)
(40%)
Visited in the field 366
Sampled wetlands 114
MosquitofishGambusia holbrooki = 72
G ldfi h Fish present
Native fish present
Feral fish present
GoldfishCarassius auratus = 10 88
50
76
(77%)
(44%)
(66%)
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ONLY feral f h t fi h
Perennial wetlands 2008
freshwater fish May have water 1019
Likely to have water 806
(50%)
(40%)
Visited in the field 366
Sampled wetlands 114
Fish present
Native fish present
Feral fish present
88
50
76
(77%)
(44%)
(66%)
Only feral fish present 37 (32%)
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Mosquitofish
DavidDavidMorgan
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ONLY native f h t fi h
Perennial wetlands 2008
freshwater fish May have water 1019
Likely to have water 806
(50%)
(40%)
Visited in the field 366
Sampled wetlands 114
Fish present
Native fish present
Feral fish present
88
50
76
(77%)
(44%)
(66%)
Only native fish present 11 (9%)
Only feral fish present 37 (32%)
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ONLY native f h t fi h
Perennial wetlands 2008
freshwater fish May have water 1019
Likely to have water 806
(50%)
(40%)
Visited in the field 366
Sampled wetlands 114
Fish present
Native fish present
Feral fish present
88
50
76
(77%)
(44%)
(66%)
Only native fish present 11 (9%)
Only feral fish present 37 (32%)
(0.5%)Native fish in mapped perennial wetlands
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Take home message
Our native freshwater fish species are under threatOur native freshwater fish species are under threat from multiple aspects
Drying lakesDrying lakesFeral introductions
What is needed?
A comprehensive survey of permanent water bodiesA t f th i t ti b t f l d ti iAssessment of the interactions between feral and native speciesAssessment of the remnant native fish populations