Management of alien fishes in the Murray‐Darling Basin

Barrett, Jim; Bamford, Heleena; Jackson, P. B. N.

doi:10.1111/emr.12095

Cited by 9 publications

(10 citation statements)

References 33 publications

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“…The Australian freshwater ecosystem is under threat from human impacts such as land degradation, pollution with fertilisers and biocides from adjacent agricultural pastures, dams and introduction of exotic species (Arthington et al 2010, Barrett et al 2014, Bond et al 2014. However, the impact of disease on the survival of native fauna could have an equally detrimental influence, especially if anthropogenic stressors work in synergy to reduce the immune functions of the animals in question (Gray et al 2009, Robert 2010.…”

Section: Discussionmentioning

confidence: 99%

Pathogenicity in six Australian reptile species following experimental inoculation with Bohle iridovirus

Ariel¹,

Wirth²,

Burgess³

et al. 2015

Dis. Aquat. Org.

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Ranaviruses are able to infect multiple species of fish, amphibian and reptile, and some strains are capable of interclass transmission. These numerous potential carriers and reservoir species compound efforts to control and contain infections in cultured and wild populations, and a comprehensive knowledge of susceptible species and life stage is necessary to inform such processes. Here we report on the challenge of 6 water-associated reptiles with Bohle iridovirus (BIV) to investigate its potential pathogenicity in common native reptiles of the aquatic and riparian fauna of northern Queensland, Australia. Adult tortoises Elseya latisternum and Emydura krefftii, snakes Boiga irregularis, Dendrelaphis punctulatus and Amphiesma mairii, and yearling crocodiles Crocodylus johnstoni were exposed via intracoelomic inoculation or co-habitation with infected con-specifics, but none were adversely affected by the challenge conditions applied here. Bohle iridovirus was found to be extremely virulent in hatchling tortoises E. latisternum and E. krefftii via intracoelomic challenge, as demonstrated by distinct lesions in multiple organs associated with specific immunohistochemistry staining and a lethal outcome (10/17) of the challenge. Virus was re-isolated from 2/5 E. latisternum, 4/12 E. krefftii and 1/3 brown tree snakes B. irregularis. Focal necrosis, haemorrhage and infiltration of granulocytes were frequently observed histologically in the pancreas, liver and sub-mucosa of the intestine of challenged tortoise hatchlings. Immunohistochemistry demonstrated the presence of ranavirus antigens in the necrotic lesions and in individual cells of the vascular endothelium, the connective tissue and in granulocytes associated with necrosis or present along serosal surfaces. The outcome of this study confirms hatchling tortoises are susceptible to BIV, thereby adding Australian reptiles to the host range of ranaviruses. Additionally, given that BIV was originally isolated from an amphibian, our study provides additional evidence that interclass transmission of ranavirus may occur in the wild.

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Section: Discussionmentioning

confidence: 99%

Pathogenicity in six Australian reptile species following experimental inoculation with Bohle iridovirus

Ariel¹,

Wirth²,

Burgess³

et al. 2015

Dis. Aquat. Org.

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“…Another significant outcome of the NFS has been the investment in developing new approaches to alien fish management, particularly Carp ( Cyprinus carpio ; Barrett et al . ). The development of the innovative Williams' Carp Separation Cage (Stuart ) which exploits the innate jumping behaviour of the species has provided a method for harvesting substantial volumes of Carp and can be deployed at fishways.…”

Section: Key Achievementsmentioning

confidence: 97%

“…The Sea to Hume programme was judged to be one of the top 25 Australasian projects listed by the Global Restoration Network: (http://www.globalrestora tionnetwork.org/countries/austra lianew-zealand/). Another significant outcome of the NFS has been the investment in developing new approaches to alien fish management, particularly Carp (Cyprinus carpio; Barrett et al 2014). The development of the innovative Williams' Carp Separation Cage (Stuart 2009) which exploits the innate jumping behaviour of the species has provided a method for harvesting substantial volumes of Carp and can be deployed at fishways.…”

Section: Key Achievementsmentioning

confidence: 99%

Laying the foundations for fish recovery: The first 10 years of the Native Fish Strategy for the Murray‐Darling Basin, Australia

Koehn¹,

Lintermans²,

Copeland³

2014

Eco Management Restoration

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The Native Fish Strategy aimed to return fish populations in Australia's largest (1 million square kilometre) river basin from an estimated 10 to 60% of pre‐European settlement levels after 50 years of implementation. While funding for implementation of this programme has now ceased (despite native fish remaining in a poor state), the achievements of the Strategy's first 10 years provide a solid basis for implementing the work necessary to rehabilitate native fish populations in the future.

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“…Anthropogenic stressors such as pollution, climate change and the introduction of exotic species continue to pose a significant threat to freshwater habitats, with almost one third of all fish species threatened by extinction [1]. The Murray-Darling Basin, the largest freshwater river system in Australia, harbours at least 12 exotic freshwater fish species [2]. Key among these are eastern mosquitofish ( Gambusia holbrooki ), redfin perch ( Perca fluviatilis ) and, most notably, common carp ( Cyprinus carpio ) [2].…”

Section: Introductionmentioning

confidence: 99%

Metagenomic sequencing reveals a lack of virus exchange between native and invasive freshwater fish across the Murray-Darling Basin, Australia

Costa

Mifsud

Gilligan

et al. 2021

Preprint

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Biological invasions are among the biggest threats to freshwater biodiversity. This is increasingly relevant in the Murray-Darling Basin, Australia, particularly since the introduction of the common carp (Cyprinus carpio). This invasive species now occupies up to 90% of fish biomass, with hugely detrimental impacts on native fauna and flora. To address the ongoing impacts of carp, cyprinid herpesvirus 3 (CyHV-3) has been proposed as a potentially effective biological control. Crucially, however, it is unknown whether CyHV-3 and other cyprinid herpesviruses already exist in the Murray-Darling. Further, little is known about those viruses that naturally occur in wild freshwater fauna, and the frequency with which these viruses jump species boundaries. To document the evolution and diversity of freshwater fish viromes and better understand the ecological context to the proposed introduction of CyHV-3, we performed a meta-transcriptomic viral survey of invasive and native fish across the Murray-Darling Basin, covering over 2,200 km of the river system. Across a total of 36 RNA libraries representing 10 species, we failed to detect CyHV-3 nor any closely related viruses. Rather, meta-transcriptomic analysis identified 18 vertebrate-associated viruses that could be assigned to the Arenaviridae, Astroviridae, Bornaviridae, Caliciviridae, Coronaviridae, Chuviridae, Flaviviridae, Hantaviridae, Hepeviridae, Paramyxoviridae, Picornaviridae, Poxviridae, Reoviridae and Rhabdoviridae families, and a further 27 that were deemed to be associated with non-vertebrate hosts. Notably, we revealed a marked lack of viruses that are shared among invasive and native fishes sampled here, suggesting that there is little virus transmission from common carp to native fish species. Overall, this study provides the first data on the viruses naturally circulating in a major river system and supports the notion that fish harbour a large diversity of viruses with often deep evolutionary histories.

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Management of alien fishes in the Murray‐Darling Basin

Cited by 9 publications

References 33 publications

Pathogenicity in six Australian reptile species following experimental inoculation with Bohle iridovirus

Pathogenicity in six Australian reptile species following experimental inoculation with Bohle iridovirus

Laying the foundations for fish recovery: The first 10 years of the Native Fish Strategy for the Murray‐Darling Basin, Australia

Metagenomic sequencing reveals a lack of virus exchange between native and invasive freshwater fish across the Murray-Darling Basin, Australia

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