Spoiled for Choice during Cold Season? Habitat Use and Potential Impacts of the Invasive Silurus glanis L. in a Deep, Large, and Oligotrophic Lake (Lake Maggiore, North Italy)

The ecological features of invasive alien species are crucial for their effective management. However, they are often lacking in newly invaded ecosystems. This is the case of the European catfish Silurus glanis L. in Lake Maggiore, where the species is present since 1990, but no scientific information is available on its ecology. To start filling this knowledge gap, 236 catfish (67 cm to 150 cm of total length) were collected, measured, and dissected for stomach content analyses from three localities and in two habitats (littoral vs. pelagic) in late autumn/early winter. The NPUE and BPUE (individuals (N) and biomass (B, in grams) per unit effort (m2), respectively) of catfish were generally higher in littoral (NPUE > 0.01; BPUE > 96) than in pelagic habitats (NPUE < 0.009; BPUE < 114), but the catfish had, on average, larger sizes in pelagic habitats. Overall, 581 individual prey items were recorded, belonging to 12 taxa. Pelagic catfish specialized their diet exclusively on three prey fish (coregonids, shad, and roach), whilst the diet of littoral catfish was more variable and dominated by crayfish, perch, and roach. These results highlighted for the first time the interaction of larger catfish with the lake’s pelagic food web, and thus possible consequences are discussed, including the potential contrasting role S. glanis may have for the lake’s fishery.

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Spoiled for Choice during Cold Season? Habitat Use and Potential Impacts of the Invasive Silurus glanis L. in a Deep, Large and Oligotrophic Lake (Lake Maggiore, North Italy)

10.20944/preprints202108.0476.v1 ◽

2021 ◽

Author(s):

Vanessa De Santis ◽

Pietro Volta

Keyword(s):

Invasive Alien Species ◽

Cold Season ◽

Effective Management ◽

Prey Fish ◽

Silurus Glanis ◽

Ecological Information ◽

Lake Maggiore ◽

European Catfish ◽

First Time ◽

Infor Mation

Ecological information of invasive alien species are crucial for their effective management. How-ever, they are often lacking in newly invaded ecosystems. This is the case of the European catfish Silurus glanis L. in Lake Maggiore where the species is present since 1990 but no scientific infor-mation are available on its ecology. To start filling this knowledge gap, 236 catfish (67 cm to 150 cm of total length) were collected, measured, and dissected for stomach content analyses from three localities and in two habitats (littoral vs. pelagic) in late autumn/early winter. NPUE and BPUE (individuals and biomass (g) per unit effort (m2)) of catfish was generally higher in littoral (NPUE > 0.01; BPUE > 96) than pelagic habitats (NPUE < 0.009; BPUE < 114) but catfish had, on average, larger sizes in pelagic habitats. Overall, 581 individual prey items were recorded belonging to12 taxa. Pelagic catfish specialized their diet exclusively on three prey fish (coregonids, shad and roach) whilst the diet of littoral catfish was more variable, and was dominated by crayfish, perch, and roach. These results highlighted for the first time the interaction of larger catfish with the lake’s pelagic food web, and thus possible consequences are discussed, including the potential contrasting role S. glanis may have for the lake’s fishery.

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One Year Monitoring of Ecological Interaction of Silurus glanis in a Novel Invaded Oligotrophic Deep Lake (Lake Maggiore)

Water ◽

10.3390/w14010105 ◽

2022 ◽

Vol 14 (1) ◽

pp. 105

Author(s):

Caterina M. Antognazza ◽

Tommaso Costantini ◽

Monica Campagnolo ◽

Serena Zaccara

Keyword(s):

Stomach Contents ◽

High Growth ◽

High Growth Rate ◽

Trophic Levels ◽

Prey Fish ◽

Silurus Glanis ◽

Orconectes Limosus ◽

Lake Maggiore ◽

European Catfish ◽

Aquatic Food

The European catfish (Silurus glanis) was introduced in Italy during the last century for aquaculture purposes, and now it is well-established. S. glanis is an invasive species and a top predator that can deplete prey supply in the surrounding habitat, leading to changes in the aquatic food web. Consequently, its presence is considered a threat to native fish populations. Its presence in the Lake Maggiore (Northern Italy) is recent and there is a lack of knowledge about its ability to completely exploit this new ecosystem throughout the year. This study corroborated the ability of European catfish to exploit both pelagic and littoral habitats, promoting trophic interactions in both habitats. Over 2019, multiple sampling approaches have been applied by collecting S. glanis and analysing its stomach contents with the aim of inferring interactions with the freshwater community. Its diet was mainly based on crayfish (Orconectes limosus), followed by six prey fish and the genus Corbicula; two fish species (Padogobius bonelli and Salaria fluviatilis) were added to the list of known prey fish. Notably and alarmingly for the early potential top-down pressure towards all trophic levels, young individuals were proved to also feed on fish and crayfish. S. glanis showed the ability to hunt at deep depths (>60 m) and a high growth rate, despite Lake Maggiore being oligotrophic.

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Artificial spawning of European catfish Silurus glanis L.: differences between propagation results after stimulation of ovulation with carp pituitary and Ovopel

Aquaculture Research ◽

10.1046/j.1365-2109.2001.00520.x ◽

2001 ◽

Vol 32 (1) ◽

pp. 11-19 ◽

Cited By ~ 9

Author(s):

E Brzuska

Keyword(s):

Silurus Glanis ◽

European Catfish ◽

Stimulation Of

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Evaluation of body weight and color of cultured European catfish (Silurus glanis) and African catfish (Clarias gariepinus) using image analysis

Aquacultural Engineering ◽

10.1016/j.aquaeng.2021.102147 ◽

2021 ◽

Vol 93 ◽

pp. 102147

Author(s):

Erkan Gümüş ◽

Adil Yılayaz ◽

Mahir Kanyılmaz ◽

Bahar Gümüş ◽

Murat Balaban

Keyword(s):

Image Analysis ◽

Body Weight ◽

Clarias Gariepinus ◽

African Catfish ◽

Silurus Glanis ◽

European Catfish

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Potential of processed animal protein versus soybean meal to replace fish meal in practical diets for European catfish (Silurus glanis): growth response and liver gene expression

Aquaculture Nutrition ◽

10.1111/anu.12487 ◽

2017 ◽

Vol 23 (5) ◽

pp. 1179-1189 ◽

Cited By ~ 15

Author(s):

S. Kumar ◽

J. Sándor Zs ◽

Z. Nagy ◽

G. Fazekas ◽

M. Havasi ◽

...

Keyword(s):

Gene Expression ◽

Soybean Meal ◽

Growth Response ◽

Fish Meal ◽

Animal Protein ◽

Silurus Glanis ◽

European Catfish ◽

Liver Gene ◽

Protein Versus

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APPLYING OF ACTIVITIES MANAGEMENT BASED ON SELF-LEARNING

EUREKA Physics and Engineering ◽

10.21303/2461-4262.2018.00530 ◽

2018 ◽

Vol 1 ◽

pp. 29-38 ◽

Cited By ~ 1

Author(s):

Valerii Samsonkin ◽

Valerii Druz’ ◽

Albert Feldman

Keyword(s):

Quality Management ◽

Technological Process ◽

Human Activities ◽

System Approach ◽

Human Operator ◽

Statistical Regularity ◽

Effective Management ◽

The Individual ◽

First Time ◽

Self Learning

The article is devoted to a brief presentation and application in practice of an effective management way of human activities and human-technical communities one. This way was called Method of statistical regularity (Method of self-organizing processes). In fact, this is a system approach. For the first time, the application of this approach is shown on the example of quality management of the technological process. Practical management is shown using an algorithm. The effectiveness of the author's system approach is explained by the consideration of the final result of the activity as a goal and a system-forming factor of activity, taking into account the individual features of the management object, real statistics of activity. The system approach described in the article is a universal devise of management. It can be used and already used to manage individual functions of the enterprise, the process, the human operator, the community

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Bryophytes of the upper reaches of the Western Bug River (Lviv Region, Ukraine)

Annales Universitatis Paedagogicae Cracoviensis Studia Naturae ◽

10.24917/25438832.5.1 ◽

2020 ◽

pp. 7-24

Author(s):

Yura Drach ◽

Zvenysvala Mamchur

Keyword(s):

Development Strategy ◽

Life Forms ◽

Wetland Ecosystems ◽

Substrate Preferences ◽

Ecological Features ◽

The Development Strategy ◽

Cold Tolerant ◽

A Minor ◽

First Time ◽

Minor Extent

In the article, the bryophytes of the upper reaches of the Western Bug River, which is physically and geographically located within Male Polissya, partly Roztochia, and to a minor extent in the Gologoro-Voronyatsky denudo-structural hills, have been studied. Based on our survey, a list of the bryophytes has been compiled for the first time. Ecological features, substrate preferences and life forms of the bryophytes have been analysed. According to the ecological features, subheliophytes (30.9%) and hemisciophytes (30.9%) predominate in the spectrum of heliomorphs; mesophytes (29.7%), hygromesophytes (21.2%) and xeromesophytes – in the spectrum of hydromorphs (19.4%); cold-tolerant species (59.4%) – in the spectrum of thermomorphs. Based on the analysis of the substrate preferences of the bryophytes, the following groups were identified: epigeans (116 species), epixils (56 species), epiphytes (46 species), epiliths (43 species), aquatic (22 species). The prevailing life forms are turf (30.3%), rough mat (18.2%), weft (15.2%), tuft (10.3%) and smooth mat (9.7%). 3 species that are officially recognised as rare and 16 species that are recognized as regionally rare have been found. In the group of bryophytes associated with wetland ecosystems, 2 officially rare and 6 regionally rare species were found in the study area. Given the large areas of drained land in Lviv Region, these species are of particular value, especially in the context of conservation of the biodiversity and protection of the valuable natural areas in accordance with the Development Strategy of Lviv Region by 2027.

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Evidence for direct transmission of the cat lungworm Troglostrongylus brevior (Strongylida: Crenosomatidae)

Parasitology ◽

10.1017/s0031182013000188 ◽

2013 ◽

Vol 140 (7) ◽

pp. 821-824 ◽

Cited By ~ 57

Author(s):

EMANUELE BRIANTI ◽

GABRIELLA GAGLIO ◽

ETTORE NAPOLI ◽

LUIGI FALSONE ◽

SALVATORE GIANNETTO ◽

...

Keyword(s):

Pulmonary Disease ◽

Scientific Information ◽

Observational Evidence ◽

Direct Transmission ◽

Emerging Pathogens ◽

Troglostrongylus Brevior ◽

New Knowledge ◽

Paratenic Hosts ◽

First Time

SUMMARYMetastrongyloids of cats are emerging pathogens that may cause fatal broncho-pulmonary disease. Infestation of definitive hosts occurs after ingestion of intermediate or paratenic hosts. Among metastrongyloids of cats, Troglostrongylus brevior and Troglostrongylus subcrenatus (Strongylida: Crenosomatidae) have recently been described as agents of severe broncho-pulmonary disease. Here, we provide, for the first time, observational evidence suggesting the direct transmission of T. brevior from queen cat to suckling kittens. This new knowledge will have a significant impact on current scientific information of this parasite and shed new light into the biology and epidemiology of metastrongyloid nematodes.

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