Observation of parasitic behaviour of an invasive neozootic fish species, the topmouth gudgeon, Pseudorasbora parva (Actinopterygii: Cypriniformes: Cyprinidae), on other cyprinid fishes

Oberle, Martin; Másílko, Jan; Wedekind, Helmut

doi:10.3750/aiep/02504

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…The topmouth gudgeon has also been found to harm other fish through parasitic behaviour (Oberle et al 2019). We only observed missing scales in mesocosm experiments and all crucian carp survived the syntopy mesocosm experiment, but this may be due to the relatively low density of topmouth gudgeon, whereas the study by Oberle et al (2019) was conducted at a high fish density relevant for pond aquaculture (Musil et al 2014). Such densities can also be relevant in some waters not used for aquaculture and the Vrabce, Smilovice and Valcha sites were numerically dominated by topmouth gudgeon.…”

Section: Complexity Of Topmouth Gudgeon Interactions With Other Speciesmentioning

confidence: 99%

“…iii. As the topmouth gudgeon is a very successful invasive species that is known for its broad and flexible dietary niche (Gozlan et al 2010;Jackson and Britton 2013), including facultative parasitism on other fish species (Oberle et al 2019), we expected that it has a larger and more flexible isotopic niche compared to the crucian carp. iv.…”

Section: Introductionmentioning

confidence: 99%

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Isotopic niches reveal the impact of topmouth gudgeon and gibel carp on native crucian carp

Šmejkal,

Thomas,

Šmejkalová

et al. 2024

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Invasive species pose a major threat to natural ecosystems and directly outcompete many native species, placing them at imminent threat of extinction. The topmouth gudgeon (Pseudorasbora parva) is on the EU’s blacklist of invasive freshwater species and threatens biodiversity, especially in wetland and floodplain ecosystems, aquacultures and village ponds. The crucian carp (Carassius carassius) is native to Europe and its populations have declined in large part of its native range, with invasive gibel carp (C. gibelio) suspected as a major cause of its decline. Invasions by topmouth gudgeon have been implicated in the decline of crucian carp populations but this still needs to be verified. The aim of this study was to evaluate by the experimental approach the competitive interaction between the two species, topmouth gudgeon and crucian carp, focusing on isotopic niche sizes and their overlap in syntopy. A four-month mesocosm experiment was performed to determine the isotopic niche of crucian carp and topmouth gudgeon living alone and in syntopy. Additionally, stable isotope data were collected at the sites where the two species co-occur to compare niche sizes and overlaps. Experimental data showed that the isotopic space of topmouth gudgeon responded more flexibly (reducing niche size at syntopy) than that of the crucian carp and confirmed a high isotopic niche overlap between the species. Field studies have shown that topmouth gudgeon has invaded the isotopic niche of the crucian carp, especially when another invasive species, the gibel carp, lived in the community (25% at 40% ellipse area and 50% at 95% ellipse area). When only the topmouth gudgeon and crucian carp were present in the field, the overlap was lower (3% and 48%, respectively) and directional overlap modelling showed that the crucian carp was more likely to invade the isotopic niche of topmouth gudgeon than vice versa. The data indicated that competition between crucian carp and topmouth gudgeon is likely, especially in syntopy with other invasive species. This study shows that the feeding plasticity of topmouth gudgeon likely facilitates its establishment outside its native range and, due to high isotopic niche overlap, threatens native fish with similar feeding ecology with competitive displacement.

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Section: Complexity Of Topmouth Gudgeon Interactions With Other Speciesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Isotopic niches reveal the impact of topmouth gudgeon and gibel carp on native crucian carp

Šmejkal,

Thomas,

Šmejkalová

et al. 2024

View full text Add to dashboard Cite

show abstract

“…P. parva stands as an interspecific competitor for food resources of native species in European countries (Britton et al ., 2010; Declerck et al ., 2002) that threatens not only biodiversity but also other ecosystem services, fish production and nutrient cycling in particular, of pond ecosystems (Kajgrová et al ., 2022; Musil et al ., 2014). P. parva might threaten reared fish directly by facultative parasitism (Oberle et al ., 2019). There is undoubtedly a need to monitor such fish in any lake restoration programme or elementary monitoring of ecological status (Kajgrová et al ., 2022).…”

Section: Introductionmentioning

confidence: 99%

A comparative study of three fishery methods for sampling the invasive topmouth gudgeon (Pseudorasbora parva) in ponds

Kajgrová

Drozd

Regenda

et al. 2023

Journal of Fish Biology

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Invasive fish threaten ponds' ecological status and their ecosystem services, therefore obtaining a representative sample of fish community composition is fundamental to fishery management, research and nature conservation. Estimates of the size distribution, density and biomass of the topmouth gudgeon (Pseudorasbora parva) model species of invasive fish in three ponds were compared among three sampling methods: electrofishing, fish‐trapping and throw‐netting. The study illustrates that the invasive fish, P. parva, can be detected by all tested fishing methods, yet our results clearly showed that there are pronounced differences among methods in population characteristic estimates. Electrofishing and throw‐netting gave biased information on the size distribution of P. parva. Fish‐trapping and throw‐netting gave reasonable P. parva density and biomass estimates, while electrofishing clearly underestimated it. All tested methods showed a body size increment of P. parva between summer and autumn sampling sessions, yet neither throw‐netting nor electrofishing recorded an increment in its density. Our study showed that fish‐trapping is the most reliable and affordable method to estimate invasive P. parva population characteristics in ponds despite more time‐demanding sampling. The success depends on the mesh size of sampling gear, operator skill and habitat structure. The cost‐effectiveness of the selected methods and the importance of invasive fish monitoring in ponds is discussed. The sampling gear must be considered carefully according to the aim of the monitoring.

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Negative effects of undesirable fish on common carp production and overall structure and functioning of fishpond ecosystems

et al. 2022

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Observation of parasitic behaviour of an invasive neozootic fish species, the topmouth gudgeon, Pseudorasbora parva (Actinopterygii: Cypriniformes: Cyprinidae), on other cyprinid fishes

Cited by 3 publications

References 10 publications

Isotopic niches reveal the impact of topmouth gudgeon and gibel carp on native crucian carp

Isotopic niches reveal the impact of topmouth gudgeon and gibel carp on native crucian carp

A comparative study of three fishery methods for sampling the invasive topmouth gudgeon (Pseudorasbora parva) in ponds

Negative effects of undesirable fish on common carp production and overall structure and functioning of fishpond ecosystems

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