Artificial Spawning Habitats Improve Egg Production of a Declining Diadromous Fish,Galaxias maculatus(Jenyns, 1842)

2013 ◽  
Vol 21 (6) ◽  
pp. 686-694 ◽  
Author(s):  
Michael J. H. Hickford ◽  
David R. Schiel
Keyword(s):  
Egg Production ◽  
Diadromous Fish ◽  
Galaxias Maculatus ◽  
Spawning Habitats

scholarly journals Smell no evil: Copper disrupts the alarm chemical response in a diadromous fish,Galaxias maculatus

2016 ◽  
Vol 35 (9) ◽  
pp. 2209-2214 ◽  
Author(s):  
Oliver R.B. Thomas ◽  
Nicole C. Barbee ◽  
Kathryn L. Hassell ◽  
Stephen E. Swearer
Keyword(s):  
Diadromous Fish ◽  
Galaxias Maculatus ◽  
Chemical Response

Estuarine geomorphology and low salinity requirement for fertilisation influence spawning site location in the diadromous fish, Galaxias maculatus

2010 ◽  
Vol 61 (11) ◽  
pp. 1252 ◽  
Author(s):  
Andy Hicks ◽  
Nicole C. Barbee ◽  
Stephen E. Swearer ◽  
Barbara J. Downes
Keyword(s):  
Site Location ◽  
Spawning Habitat ◽  
Classification Schemes ◽  
Diadromous Fish ◽  
Low Salinity ◽  
Spawning Site ◽  
Species Survival ◽  
Galaxias Maculatus ◽  
Stratified Estuaries ◽  
Physical And Chemical

In habitats such as estuaries, which are characterised by large and fluctuating gradients in abiotic variables, finding appropriate habitat for successful spawning and egg development can be critical to a species’ survival. We explored how salinity requirements for successful fertilisation may govern the distribution of estuarine spawning habitat for the diadromous fish, Galaxias maculatus, which spawns in inundated vegetation on estuary banks during spring tides. Artificial fertilisation experiments confirmed that successful fertilisation only occurs at low salinities (<20). Thus, we predicted that egg distributions would depend upon the extent of low-salinity surface waters in an estuary. Using estuary geomorphology classification schemes, which classify estuaries by physical and chemical characteristics such as their salinity dynamics, we hypothesised that stratified estuaries would provide a greater extent of low salinity surface water than well-mixed estuaries. This prediction was supported by surveys of egg distributions in five estuaries in Victoria, Australia. Eggs were distributed over a greater proportion of ‘stratified’ v. ‘mixed’ estuary types. We suggest that combining knowledge of the spawning requirements of a species and physical properties of the habitat, such as those encapsulated in estuary geomorphic classification schemes, can greatly facilitate efforts to identify critical habitats and thus aid in species management and conservation.

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