Fish Stock Assessment of Lake Schulen, Flanders: A Comparison Between 1988 and 1999

Simoens, Ilse; Breine, Jan; Verreycken, Hugo; Belpaire, Claude

doi:10.1002/9780470995679.ch5

Cited by 4 publications

(7 citation statements)

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“…Because of uncertainty regarding the native status of certain species, three fishes were not included in the non‐indigenous fish fauna list: European catfish Silurus glanis L., sunbleak Leucaspius delineatus (Heckel) and European bullhead Cottus gobio L. The two former species have been categorized as non‐indigenous by Welcomme (1988) and Louette et al (2001); however, Van Neer & Ervynck (1993) discovered archaeological remains of European catfish in Flanders that date from the Neolithic to the 12th century. This suggests that European catfish was native to Flanders, was extirpated locally by some agent (human or natural), and the current wild (and probably reproducing) population (Simoens et al , 2002) is effectively a re‐introduced species (escapees or re‐introduced illegally). There are no archaeological records of sunbleak in Flanders (Van Neer & Ervynck, 1993), but its bones were probably overlooked at archaeological sites (W. Van Neer, pers.…”

Section: Methodsmentioning

confidence: 99%

The non‐indigenous freshwater fishes of Flanders (Belgium): review, status and trends over the last decade

Verreycken

Anseeuw

Thuyne

et al. 2007

Journal of Fish Biology

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Fourteen non-indigenous fish species have been successfully introduced to the wild within the territory of Flanders; nine are considered naturalized. Most of the introductions occurred prior to 1950, with six species introduced since then. This paper reviews the available, hitherto scattered, information (including 'grey literature') on these 14 non-indigenous fish species introductions, and evaluates a decade of data from fisheries surveys to assess the recent development of these non-indigenous populations. Gibel carp Carassius gibelio and topmouth gudgeon Pseudorasbora parva are the most widespread of the non-indigenous species in Flemish waters, and both continue to expand their ranges. A reduction in range has been observed in brown bullhead Ameiurus nebulosus only. A case is presented for not including European catfish Silurus glanis, sunbleak Leucaspius delineatus and European bullhead Cottus gobio on the list of non-indigenous freshwater fishes in Flanders. Also discussed are non-indigenous fish species that are likely to colonize Flanders inland waters in the near future.

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Section: Methodsmentioning

confidence: 99%

The non‐indigenous freshwater fishes of Flanders (Belgium): review, status and trends over the last decade

Verreycken

Anseeuw

Thuyne

et al. 2007

Journal of Fish Biology

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“…The species apparently disappeared from all three of these countries for a period of time (Bruylants et al. 1989; De Nie 1996 in Simoens et al. 2002; Louette et al.…”

Section: Distribution and Habitatmentioning

confidence: 99%

“…This shallow, man‐made lake was built as a flood storage reservoir, with extensive fish stock assessments completed in 1988 (no S. glanis ) and 1999 ( S. glanis were found). It transpired that a number of large individuals, which been illegally introduced by anglers in the early 1990s, had successfully reproduced culminating in the capture of eight juveniles (8–14 cm) in the 1999 survey (Simoens et al. 2002).…”

Section: Distribution and Habitatmentioning

confidence: 99%

“…However, subsequent archaeological evidence demonstrated that S. glanis was originally native to parts of Belgium, the Netherlands and France (Van Neer and Ervynck 1993;Volz 1994). The species apparently disappeared from all three of these countries for a period of time (Bruylants et al 1989;De Nie 1996in Simoens et al 2002Louette et al 2002), but has been re-categorized as 'reintroduced' to Flanders (Verreycken et al 2007) and the Rhône valley in France (Valadou 2007). Other S. glanis have entered the Netherlands from neighbouring countries, as escapee fish upstream of aquaculture facilities (in Germany) that migrated naturally down the River Rhine (De Groot 1985).…”

Section: Non-native Distributionmentioning

confidence: 99%

“…Wild populations of re-introduced S. glanis have done quite well in France, especially in the southwest (Valadou 2007) and in the River Saône (DIREN Rhône-Alpes 2004) -the latter a consequence of S. glanis escapes into the River Doubs in about 1890 (Valadou 2007). However, the species occurs in limited numbers in the Flemish part of Belgium and is probably reproducing (Simoens et al 2002). Activities at Lake Schulen in Flanders reveal how re-introduced populations can establish following an introduction.…”

Section: Non-native Distributionmentioning

confidence: 99%

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Voracious invader or benign feline? A review of the environmental biology of European catfish Silurus glanis in its native and introduced ranges*

et al. 2009

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A popular species for food and sport, the European catfish (Silurus glanis) is well-studied in its native range, but little studied in its introduced range. Silurus glanis is the largestbodied freshwater fish of Europe and is historically known to take a wide range of food items including human remains. As a result of its piscivorous diet, S. glanis is assumed to be an invasive fish species presenting a risk to native species and ecosystems. To assess the potential risks of S. glanis introductions, published and 'grey' literature on the species' environmental biology (but not aquaculture) was extensively reviewed. Silurus glanis appears well adapted to, and sufficiently robust for, translocation and introduction outside its native range. A nest-guarding species, S. glanis is long-lived, rather sedentary and produces relatively fewer eggs per body mass than many fish species. It appears to establish relatively easily, although more so in warmer (i.e. Mediterranean) than in northern countries (e.g. Belgium, UK). Telemetry data suggest that dispersal is linked to flooding/spates and human translation of the species. Potential impacts in its introduced European range include disease transmission, hybridization (in Greece with native endemic Aristotle's catfish [Silurus aristotelis]), predation on native species and possibly the modification of food web structure in some regions. However, S. glanis has also been reported (France, Spain, Turkmenistan) to prey intensively on other non-native species and in its native Germany to be a poor biomanipulation tool for top-down predation of zooplanktivorous fishes. As such, S. glanis is unlikely to exert trophic pressure on native fishes except in circumstances where other human impacts are already in force. In summary, virtually all aspects of the environmental biology of introduced S. glanis require further study to determine the potential risks of its introduction to novel environments.

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Silurus glanis (wels catfish)

Rees¹

2022

CABI Compendium

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Fish Stock Assessment of Lake Schulen, Flanders: A Comparison Between 1988 and 1999

Cited by 4 publications

References 6 publications

The non‐indigenous freshwater fishes of Flanders (Belgium): review, status and trends over the last decade

The non‐indigenous freshwater fishes of Flanders (Belgium): review, status and trends over the last decade

Voracious invader or benign feline? A review of the environmental biology of European catfish Silurus glanis in its native and introduced ranges*

Silurus glanis (wels catfish)

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