Review
Virology
Mona Saleh, Boglarka Sellyei, Gyula Kovacs, Csaba Szekely
Summary: Disease management and pathogen control are crucial for a successful fish farming industry, especially in European catfish farming. While ranavirus and circovirus are well-described pathogens, the etiological role of other viruses in catfish remains unclear, necessitating further investigation.
Article
Agronomy
Cristina Simeanu, Emanuel Magdici, Benone Pasarin, Bogdan-Vlad Avarvarei, Daniel Simeanu
Summary: Quantitative and qualitative flesh production in Silurus glanis species from aquaculture and a natural environment were comparatively studied. The results showed better values in aquaculture catfish in terms of morphology and yield. Postslaughter, the quality and nutritional value of the fish flesh changed during the refrigeration period. The study also found that the origin of the fish and refrigeration period influenced the flesh composition and nutritional value of European catfish.
Article
Biochemistry & Molecular Biology
Merve Tinkir, Devrim Memis, Yu Cheng, Miaomiao Xin, Marek Rodina, David Gela, Vladimira Tuckov, Otomar Linhart
Summary: This study focused on the short-term storage of European catfish eggs, finding that fertilization and total hatching rates decreased with storage time at 17 degrees Celsius. The optimal in vitro fertilization time was determined to be 5 hours. While egg storage time did not correlate with fry malformation levels, storage temperature above 17 degrees Celsius had a clear impact on hatching and malformation rates.
FISH PHYSIOLOGY AND BIOCHEMISTRY
(2021)
Article
Ecology
Samuel Westrelin, Mathieu Moreau, Vincent Fourcassie, Frederic Santoul
Summary: This study analyzed the overwintering behavior of European catfish and found that the formation of aggregations was triggered by low temperatures. The stability of these aggregations was influenced by decreasing temperatures, and individuals were more likely to leave the aggregation at dusk and at night when temperatures increased. Additionally, the size of the fish and the timing of arrival also affected the aggregative behavior.
Article
Virology
Flora Abonyi, Adam Varga, Boglarka Sellyei, Edit Eszterbauer, Andor Doszpoly
Summary: This study highlights the varying impacts of European catfish virus (ECV) infection in different age groups of wels catfish. The youngest age group showed the highest mortality rates, emphasizing the importance of preventing and protecting against virus infections in juvenile wels catfish (up to 3 months old) in aquaculture.
Article
Fisheries
Zsuzsanna J. Sandor, Norbert Revesz, Katalin Kinga Lefler, Radmilo Colovic, Vojislav Banjac, Shivendra Kumar
Summary: Two experiments were conducted to evaluate the suitability of corn DDGS as a protein source for European catfish. The results showed that corn DDGS is a beneficial protein source for European catfish and 30% DDGS can be included in their diet without compromising growth performance and nutrient utilization.
AQUACULTURE REPORTS
(2021)
Article
Agricultural Engineering
Erkan Gumus, Adil Yilayaz, Mahir Kanyilmaz, Bahar Gumus, Murat Balaban
Summary: Image analysis was used to evaluate weight estimation and colors of European catfish and African catfish. Different equations were used to determine the relationships between weight and length/view area, showing slight differences between the two fish species. The average color values showed no significant difference between the two species.
AQUACULTURAL ENGINEERING
(2021)
Article
Biodiversity Conservation
Paul Castagne, Ivan Paz-Vinas, Stephanie Bouletreau, Jessica Ferriol, Geraldine Loot, Charlotte Veyssiere, Robert Arlinghaus, Robert Britton, Marlene Chiarello, Emili Garcia-Berthou, Pavel Horky, Delphine Nicolas, Annamaria Nocita, Oscar Nordahl, Michaël Ovidio, Filipe Ribeiro, Ondrej Slavik, Chloe Vagnon, Simon Blanchet, Frederic Santoul
Summary: Biological invasions are a significant component of global change, but they can also have negative impacts on native populations. Efficient management policies are needed to prevent the spread of invasive species in non-native areas while protecting native populations. Genetic variation analysis can help assess the genetic state, identify invasion pathways, determine management strategies, and identify populations requiring conservation measures.
BIODIVERSITY AND CONSERVATION
(2023)
Article
Virology
Andras Surjan, Eszter Fonagy, Edit Eszterbauer, Balazs Harrach, Andor Doszpoly
Summary: A novel papillomavirus, SgPV1, was discovered in farmed wels catfish in Hungary and its complete genome was identified through next-generation sequencing. This new fish papillomavirus shares similarities in gene structure with other fish papillomaviruses but differs from those found in higher vertebrates.
ARCHIVES OF VIROLOGY
(2021)
Article
Fisheries
Chloe Vagnon, Franck Cattaneo, Chloe Goulon, Jean Guillard, Victor Frossard
Summary: This study assessed the vulnerability of whitefish to European catfish invasion in peri-Alpine lakes and found that the catfish effectively consumed whitefish, with young individuals being the most vulnerable. These findings suggest that the European catfish may pose a growing threat to whitefish in the context of global change.
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
(2022)
Article
Ecology
Westrelin Samuel, Bouletreau Stephanie, Santoul Frederic
Summary: Hypoxic events are increasingly severe in freshwater ecosystems due to human activities. In a study conducted in southeastern France, European catfish were found to withstand very low dissolved oxygen concentrations and increased their activity and visited a larger surface area during a hypoxic event. This ability, along with their high optimum temperature range, could give catfish a competitive advantage over other predatory species in the context of global change.
Article
Fisheries
K. Koprucu, S. Mise Yonar, S. Koprucu, Me Yonar
Summary: This study examined the effects of different stocking densities on the growth, oxidative stress, antioxidant enzymes, and hematological and immunological values in European catfish. The findings showed that high stocking densities can lead to oxidative stress in fish and have negative impacts on their health and growth.
AQUACULTURE INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
Kinga Szekvari, Zoltan Szabolcsi, Barbara Kutasy, Geza Hegedus, Eszter Virag
Summary: New complete mitogenome sequences of Silurus glanis from 4 samples were presented in this study, including male and female individuals from Hungary and Czech Republic. The complete mitochondria were determined using Illumina MiSeq platform, with de novo assembly resulting in one nod covering the total mitochondria in each sample. The mitochondrial genomes consisted of 13 protein-coding genes, 2 ribosomal RNA genes, 22 transfer RNA genes, and 1 control region.
Article
Biodiversity Conservation
Lourdes Encina, Amadora Rodriguez-Ruiz, Carlos Orduna, Juan Ramon Cid, Carlos Granado-Lorencio
Summary: This study investigates the impact of the invasive European catfish on the fish community of the Torrejon reservoir. The results show a significant decrease in the abundance and biomass of the Iberian barbel due to the European catfish.
BIOLOGICAL INVASIONS
(2023)
Article
Fisheries
Chloe Vagnon, Simon Bazin, Franck Cattaneo, Chloe Goulon, Jean Guillard, Victor Frossard
Summary: The European catfish (Silurus glanis) in large peri-alpine lakes primarily relies on littoral resources but also consumes prey from pelagic and deep benthic habitats. Individual diet variations are mostly reflected in stomach contents, supporting opportunistic trophic behavior. Body size has minimal impact on the catfish's diet, indicating that ontogeny does not strongly shape its feeding habits. This study highlights the feeding plasticity of the European catfish and its ability to exploit resources from different habitats in peri-alpine lakes.
ECOLOGY OF FRESHWATER FISH
(2022)
Editorial Material
Fisheries
Robin DeBruyne, Edward Roseman, Martin Cech
Article
Environmental Sciences
Daniel Barton, Zuzana Sajdlova, Tomas Kolarik, Jan Kubecka, Jindrich Duras, David Kortan, Marek Smejkal
Summary: Rheophilic fishes are declining rapidly in number due to various habitat modifications and discharge regulations. Installing a flow deflector can mitigate the effects of discharge increases on a spawning ground, resulting in higher recruitment of rheophilic fishes.
RIVER RESEARCH AND APPLICATIONS
(2023)
Review
Environmental Sciences
Marek Smejkal, Daniel Barton, Jindrich Duras, Pavel Horky, Milan Muska, Jan Kubecka, Nikola Pfauserova, Million Tesfaye, Ondrej Slavik
Summary: Most lotic ecosystems have been modified to serve human needs, such as building dams. Reservoirs have significant impacts on freshwater ecosystems and rheophilic fishes. Competition, predation, and the establishment of generalist species in altered river sections all affect the composition of rheophilic communities in tributaries. Identifying gaps in understanding mechanisms of fauna at habitat edges and conducting telemetry and trophic interaction studies are necessary for conservation efforts to protect rheophilic fish populations.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Ecology
Marek Smejkal, Ondrej Dockal, Kiran Thomas, Chandani R. Verma, Pradeep Kumkar, Lukas Kalous
Summary: This study presents evidence of the Chinese sleeper's first documented occurrence in the Elbe River basin in Czechia. The fish was caught by a fisherman and shared on social media. It has been present in interconnected ponds and streams for ten years and may have spread over a larger area. Eradication measures are recommended to prevent further spread.
Correction
Ecology
Marek Smejkal, Ondrej Dockal, Kiran Thomas, Chandani R. R. Verma, Pradeep Kumkar, Lukas Kalous
Article
Biodiversity Conservation
Sandip Tapkir, Kiran Thomas, Lukas Kalous, Mojmir Vasek, Travis B. Meador, Marek Smejkal
Summary: The introduction of invasive species, such as the gibel carp, can lead to increased competition with native species like the crucian carp in an ecosystem. The vacant niche hypothesis suggests that the invasive species may have a competitive advantage if it can access food sources that are not available to the native species. Through stable isotope analysis of fish scales, it was found that the gibel carp had a lower trophic position and higher utilization of littoral food sources, giving it a competitive edge over the crucian carp. The study also showed that environmental conditions, such as a rich littoral zone, could reduce overlap in trophic niches between the two species.
BIOLOGICAL INVASIONS
(2023)
Article
Marine & Freshwater Biology
Karlos R. R. de Moraes, Allan T. T. Souza, Milan Muska, Milan Hladik, Martina Ctvrtlikova, Vladislav Drastik, Tomas Kolarik, Andrea Kucerova, Monika Krolova, Zuzana Sajdlova, Marek Smejkal, Jan Kubecka
Summary: Habitat complexity in freshwater ecosystems has declined due to human impacts, leading to intensified conservation and environmental management efforts. Artificial floating islands (AFIs) are being used as a management action to enhance aquatic organism populations. This study found that AFIs installed in the littoral area of Lipno Reservoir, Czech Republic, with local wetland vegetation, significantly increased the densities of juvenile roach and perch, and even hosted apex predators exclusively. AFIs can serve as nursery ground for age 0+ fish in lentic systems and support fish populations in degraded habitat conditions.
Article
Fisheries
Lenka Kajgrova, Borek Drozd, Jan Regenda, Vladislav Drastik, Lubos Kocvara, Tomas Kolarik, Jiri Peterka, Petr Blabolil
Summary: Invasive fish pose a threat to the ecological status and ecosystem services of ponds, making it crucial to accurately assess the composition of fish communities. This study compared three different sampling methods - electrofishing, fish-trapping, and throw-netting - to estimate the size distribution, density, and biomass of the invasive fish species, Pseudorasbora parva. The results showed that all three methods successfully detected P. parva, but there were significant differences in population characteristics estimates among the methods. Fish-trapping was found to be the most reliable and cost-effective method for estimating P. parva population characteristics in ponds, despite requiring more time for sampling. The study emphasizes the importance of selecting appropriate sampling gear for monitoring invasive fish in ponds.
JOURNAL OF FISH BIOLOGY
(2023)
Article
Ecology
Marek Smejkal, Daniel Barton, Petr Blabolil, Tomas Kolarik, Jan Kubecka, Zuzana Sajdlova, Allan T. Souza, Marek Brabec
Summary: By tagging and tracking 1702 individuals of Leuciscus aspius, researchers found that various environmental cues, including day number, water temperature, wind speed, and lunar phase, influenced the size of reproductive aggregations in freshwater fish. The study emphasizes the importance of obtaining diverse data sets to accurately interpret reproductive timing.
Article
Biodiversity Conservation
Milan Riha, Marie Prchalova, Marek Brabec, Vladislav Drastik, Milan Muska, Michal Tuser, Daniel Barton, Petr Blabolil, Martin Cech, Jaroslava Frouzova, Michaela Holubova, Tomas Juza, Karlos R. Moraes, Ruben Rabaneda-Bueno, Zuzana Sajdlova, Allan T. Souza, Marek Smejkal, Mojmir Vasek, Lukas Vejrik, Ivana Vejrikova, Jiri Peterka, Jan Kubecka
Summary: Fish are important for aquatic ecosystems, and accurate assessments of their population variables are crucial for ecological applications. Gillnets are commonly used to assess fish populations, but there is no reliable model to calculate fish quantity from gillnet catches. This study calibrated gillnet catches using active methods and developed a tool to assess fish quantity from gillnet catches. The results showed a strong positive linear relationship between fish biomasses sampled with gillnets and active methods.
ECOLOGICAL INDICATORS
(2023)
Article
Environmental Sciences
Pankaj A. Gorule, Marek Smejkal, Sandip Tapkir, Yevdokiia Stepanyshyna, Vlastimil Stejskal, Maria Cristina Follesa, Alessandro Cau
Summary: This study reveals that anthropogenic polymeric particles can have detrimental effects on the behavior and movement skills of fish, and invasive species may have a higher tolerance towards pollutants. Fish exposed to polyethylene and tire wear particles showed bolder behavior and higher risk-taking, while invasive gibel carp exhibited better swimming performance.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Biology
Lukas Vejrik, Ivana Vejrikova, Petr Blabolil, Zuzana Sajdlova, Lubos Kocvara, Tomas Kolarik, Daniel Barton, Tomas Juza, Marek Smejkal, Jiri Peterka, Martin Cech
Summary: This study used an innovative and non-lethal approach to investigate niche widths and individual specialization based on isotopic signals. It analyzed four different body tissues with different isotopic half-lives and yielded crucial results on trophic interactions of fish. The study suggests that the observed trends may be applicable to other food webs with similar trophic positions, and highlights the impact of eutrophication on foraging behavior.
Article
Ecology
Kiran Thomas, Marek Smejkal, Paingamadathil Ommer Nameer
Summary: This study investigated the dietary choices and foraging behavior of the Grizzled Giant Squirrel in Chinnar Wildlife Sanctuary, India. The squirrel was found to primarily feed on trees and showed some dietary adaptability. The diversity of mature trees and plants is crucial for the conservation of this species.
ECOLOGY AND EVOLUTION
(2023)
Article
Biodiversity Conservation
Kiran Thomas, Marek Brabec, Sandip Tapkir, Milan Gottwald, Daniel Barton, Marek Smejkal
Summary: Invasive alien species can cause significant loss of biodiversity. Early detection by citizens can serve as an indicator of invasion. This study found that invasive gibel carp were more easily detected through angling, while native crucian carp were more easily detected through trapping.
GLOBAL ECOLOGY AND CONSERVATION
(2023)
