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Batemans Bay, Australia

Koehn J.D.,Arthur Rylah Institute for Environmental Research | Lintermans M.,University of Canberra | Lyon J.P.,Arthur Rylah Institute for Environmental Research | Ingram B.A.,Australian Department of Primary Industries and Fisheries | And 3 more authors.
Marine and Freshwater Research

Recovery of threatened species is often necessarily a long-term process. The present paper details the progress towards the recovery of trout cod, Maccullochella macquariensis, an iconic, long-lived fish species first listed as threatened in the 1980s. The objectives, actions and progress over three successive national recovery plans (spanning 18 years) are assessed, documenting changes to population distribution and abundance and updating ecological knowledge. Increased knowledge (especially breeding biology and hatchery techniques, movements, habitats and genetics) has greatly influenced recovery actions and the use of a population model was developed to assist with management options and stocking regimes. Key recovery actions include stocking of hatchery-produced fish to establish new populations, regulations on angling (including closures), education (particularly identification from the closely related Murray cod, M. peelii) and habitat rehabilitation (especially re-instatement of structural woody habitats). In particular, the establishment of new populations using hatchery stocking has been a successful action. The importance of a coordinated long-term approach is emphasised and, although there is uncertainty in ongoing resourcing of the recovery program, much has been achieved and there is cautious optimism for the future of this species. Journal compilation © CSIRO 2013. Source

Ellis I.,La Trobe University | Whiterod N.,Aquasave Nature Glenelg Trust | Linklater D.,La Trobe University | Bogenhuber D.,La Trobe University | And 2 more authors.
Austral Ecology

The spangled perch Leiopotherapon unicolor is considered a rare vagrant in the southern Murray-Darling Basin, Australia, due to its intolerance of the relatively cool water temperatures that prevail during winter months. This study details 1342 records of the species from 68 locations between 2010 and 2014 outside its accepted 'core adult range' following widespread flooding during 2010 and 2011. Although records of the species declined over 2013, L.unicolor remained resident in the southern Murray-Darling Basin as of April 2014. The species persisted in several locations for three consecutive winters with recruitment documented at two sites. This study represents the first identification of the dispersal of large numbers of L.unicolor into the southern Murray-Darling Basin, persistence beyond a single winter, and recruitment by the species in habitats south of its recognized 'core adult range'. Targeted research would determine the potential for predicted environmental changes (artificially warmer drainage wetlands, climate change and greater floodplain connectivity) to facilitate longer term persistence and range expansion by the species in the southern Murray-Darling Basin. © 2015 Ecological Society of Australia. Source

Lugg .A.,Fisheries NSW | Copeland C.,Fisheries NSW
Ecological Management and Restoration

Summary: The release of water from deep below the surface of large dams causes significant disturbance to water temperature regimes in downstream river channels with consequent impacts upon aquatic biota and river health. The Murray-Darling Basin (MDB) has a large number of dams, which are known to cause cold water pollution (CWP) in the downstream reaches of the impounded rivers. This study reviews the situation with regard to CWP in the MDB including the location, magnitude and extent of temperature suppression, the impacts upon fish, constraints and progress towards ameliorating the problem. © 2014 Ecological Society of Australia. Source

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