Influence of diseases on the wild eel stock: The case of Albufera Lake

Esteve, Consuelo; Alcaide, Elena

doi:10.1016/j.aquaculture.2008.12.015

Cited by 36 publications

(51 citation statements)

References 25 publications

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“…Then body mass ( M ), total length ( L ) and pathological signs were recorded for all individuals. Microbiological analyses were performed on the individuals, as previously reported (Esteve & Alcaide ). Bacteria were isolated on tryptone soy agar plates (Oxoid) plus 0.5% (wt/vol) NaCl (TSA‐1) from liver, kidney or ulcers.…”

Section: Methodsmentioning

confidence: 99%

“…Vibrio vulnificus , Edwardsiella tarda and mesophilic Aeromonas ) from wild eels caught in the L′Albufera Lake (Esteve & Alcaide , ) without outbreak events. These bacterial diseases were found at an overall prevalence of around 30% (Esteve & Alcaide , ). This study reports the finding of Shewanella putrefaciens and S. xiamenensis as leading pathogens of this eel fishery at present, highlighting the environmental conditions at the L′Albufera Lake that favour an outbreak of such disease.…”

Section: Introductionmentioning

confidence: 99%

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An outbreak of Shewanella putrefaciens group in wild eels Anguilla anguilla L. favoured by hypoxic aquatic environments

Esteve

Merchán

Alcaide

2016

Journal of Fish Diseases

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Microbiological analyses were conducted on wild eels from the L'Albufera Lake (Spain). A total of 174 individuals were collected in two surveys (i.e. year 2008 and autumn-winter 2014) among those caught by local fishermen into the lagoon. The prevalence of Shewanella putrefaciens group was 1.7% in 2008 and rose above 32% in 2014. It was due to an outbreak of shewanellosis that presented a morbidity rate of 64%. S. putrefaciens group strains were isolated as pure cultures from the sick eels that showed white ulcers surrounded by a reddish inflammation, damage of the mouth, extensive skin discoloration, exophthalmia, ascites and bad odour. The S. putrefaciens group was recovered from freshwater samples taken at the L'Albufera system, along autumn-winter 2015. Its counts significantly increased in freshwater parallel to hypoxia and temperature rising. Shewanellae strains were identified as S. putrefaciens and S. xiamenensis by 16S rRNA gene sequencing. These isolates recovered from sick eels or freshwater were virulent for European eel by IP challenge (LD 10 CFU g body weight). They also caused 30-38% cumulative mortality, in European eels challenged by a 2-h bath (10 CFU mL ). These results suggest that shewanellosis could be transmitted through water highlighting the fact that hypoxic conditions increase this bacterium levels in water.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An outbreak of Shewanella putrefaciens group in wild eels Anguilla anguilla L. favoured by hypoxic aquatic environments

Esteve

Merchán

Alcaide

2016

Journal of Fish Diseases

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“…In the case of France, Spain and Italy, only few works have been recently published about the status of local eel stocks (Bordajandi et al 2003;Buet et al 2006;Ferrante et al 2010) and little is known about the past decades (Bressa et al 1997). A. crassus has been extensively monitored in the Camargue Lagoon and in other Mediterranean inland and coastal waters (Lefebvre et al 2002(Lefebvre et al , 2003Lefebvre and Crivelli 2004;Maillo et al 2005;Genc et al 2005;Esteve and Alcaide 2009). Other than a few notable exceptions, the quality of eels fished and farmed in the coastal areas of the rest of the Southern Europe and Northern Africa is almost unknown (Maamouria et al 1999;Rahhou et al 2001;Gargouri Ben Abdallah and Maamouria 2006).…”

Section: Introductionmentioning

confidence: 99%

Contamination, parasitism and condition of Anguilla anguilla in three Italian stocks

et al. 2012

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In conjunction with habitat loss and overfishing, pollution and parasitism are believed to be relevant causes of collapse of Anguilla, as these can affect eel swimming ability and the development of gonads and embryos. The present study investigated Persistent Organic Pollutant (POP) concentrations, infection levels of Anguillicoloides crassus, lipid content and gonad abnormalities in eels sampled in 2007-2008 in three Italian water bodies (Caprolace Lake, Lesina Lagoon and Tevere River) that vary in salinity, trophic condition, contamination level and fishing pressure. Our analysis revealed that low-to-moderate levels of contamination and parasitism were not associated with gonad abnormalities in Caprolace Lake and Lesina Lagoon. On the contrary, POP concentrations and abundances of swim bladder nematodes were remarkably high in eels from the heavily urbanized Tevere River and were associated with significant gonad and swim bladder alterations. Contamination and infestation levels were so high to potentially impair spawner successful migration and reproduction. POP concentrations in Tevere eels also exceeded levels considered safe for food consumption. Though marginally contaminated, eels from the oligotrophic Caprolace Lake were in critical health condition: their lipid reserve was so low as to be considered insufficient to sustain the energetic costs of the transoceanic migration. Lesina eel stock was the only one displaying relatively good quality but here spawner abundance is likely limited by overfishing. Our results suggest that multiple stressors may potentially affect eel reproductive success. More definitive studies are needed to assess whether health effects caused by these multiple stressors are additive, compensatory or synergistic.

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“…The cause of the decline is unknown, but is probably multifactorial, with suggested factors including pollution, habitat loss, fisheries, migration barriers, and diseases (Dekker 2004). Indeed, the swimbladder nematode Anguillicoloides crassus (Székely et al 2009), several pathogenic bacteria (Esteve & Alcaide 2009) and certain viruses (Haenen et al 2009) have been suggested to play a contributory role in the decline of the wild European eel Anguilla anguilla stock.…”

Section: Introductionmentioning

confidence: 99%

Viral diseases of wild and farmed European eel Anguilla anguilla with particular reference to the Netherlands

Beurden

Engelsma²,

Roozenburg³

et al. 2012

Dis. Aquat. Org.

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Influence of diseases on the wild eel stock: The case of Albufera Lake

Cited by 36 publications

References 25 publications

An outbreak of Shewanella putrefaciens group in wild eels Anguilla anguilla L. favoured by hypoxic aquatic environments

An outbreak of Shewanella putrefaciens group in wild eels Anguilla anguilla L. favoured by hypoxic aquatic environments

Contamination, parasitism and condition of Anguilla anguilla in three Italian stocks

Viral diseases of wild and farmed European eel Anguilla anguilla with particular reference to the Netherlands

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