Tomáš Jůza
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View article: Validating gut flushing as a non‐lethal sampling technique for diet monitoring in agastric fish
Validating gut flushing as a non‐lethal sampling technique for diet monitoring in agastric fish Open
Non‐lethal diet sampling is essential where individual‐level monitoring and welfare matter, yet evidence on season‐long outcomes in agastric fishes is scarce. We tested syringe‐based gut flushing in pond‐reared common carp Cyprinus carpio …
View article: Factors Influencing the Stocking of Juvenile Pikeperch ( <i>Sander lucioperca</i> )
Factors Influencing the Stocking of Juvenile Pikeperch ( <i>Sander lucioperca</i> ) Open
Predator species of fish play crucial roles in ecosystem balance through top‐down control, a mechanism frequently exploited in biomanipulation to stock predator species. Juvenile pikeperch ( Sander lucioperca ) were stocked ( n = 52,887) i…
View article: Differential activity of transcription factors and neuronal effectors during the development of pikeperch brain
Differential activity of transcription factors and neuronal effectors during the development of pikeperch brain Open
Juvenile pikeperch (Sander lucioperca) undergo several ontogenetic shifts, the timing of which determines the survival of their first winter. The shift from planktivory to a more active piscivorous phenotype involves moving from pelagic to…
View article: Long‐term shifts in pikeperch, <scp><i>Sander lucioperca</i></scp>, diet composition in a changing reservoir
Long‐term shifts in pikeperch, <span><i>Sander lucioperca</i></span>, diet composition in a changing reservoir Open
As a significant piscivorous predator, the pikeperch ( Sander lucioperca ) plays a critical role in regulating aquatic ecosystems. Understanding its size‐related feeding behaviour is thus vital for assessing its impact. To evaluate its rol…
View article: Corrigendum to “Long-lines for research monitoring and efficient population regulation of an invasive apex predator, European catfish (Silurus glanis)” [Heliyon Volume 10, Issue 14, 30 July 2024, Article e34125]
Corrigendum to “Long-lines for research monitoring and efficient population regulation of an invasive apex predator, European catfish (Silurus glanis)” [Heliyon Volume 10, Issue 14, 30 July 2024, Article e34125] Open
[This corrects the article DOI: 10.1016/j.heliyon.2024.e34125.].
View article: Distinct Intra‐Cohort Resource Utilization in Young‐of‐the‐Year Pikeperch ( <scp> <i>Sander lucioperca</i> </scp> ): Evidence From Diet and Isotopic Analysis
Distinct Intra‐Cohort Resource Utilization in Young‐of‐the‐Year Pikeperch ( <span> <i>Sander lucioperca</i> </span> ): Evidence From Diet and Isotopic Analysis Open
Intraspecific competition is a fundamental selective force in animals, leading to various specializations that influence ecological interactions. Diet composition and trophic position at the early life stages substantially influence fish g…
View article: Hungry Catfish—Effect of Prey Availability on Movement Dynamics of a Top Predator
Hungry Catfish—Effect of Prey Availability on Movement Dynamics of a Top Predator Open
The availability and spatial distribution of prey determine the energetic costs of predators foraging and largely drive their space use, activity level and foraging timing. Consequently, predators in ecosystems with different prey availabi…
View article: Pelagic distribution and night foraging of early juvenile <scp>European</scp> catfish (<i>Silurus glanis</i><scp>L</scp>.)
Pelagic distribution and night foraging of early juvenile <span>European</span> catfish (<i>Silurus glanis</i><span>L</span>.) Open
This study provides evidence of pelagic occurrence and night feeding in early juvenile European catfish that contributed 0.2% to the early juvenile pelagic community at night in Klíčava, 0.3% in Římov, and 3.3% in Žlutice Reservoirs in the…
View article: Transition to Piscivory Seen Through Brain Transcriptomics in a Juvenile Percid Fish: Complex Interplay of Differential Gene Transcription, Alternative Splicing, and ncRNA Activity
Transition to Piscivory Seen Through Brain Transcriptomics in a Juvenile Percid Fish: Complex Interplay of Differential Gene Transcription, Alternative Splicing, and ncRNA Activity Open
Pikeperch ( Sander Lucioperca ) belongs to main predatory fish species in freshwater bodies throughout Europe playing the key role by reducing planktivorous fish abundance. Two size classes of the young‐of‐the‐year (YOY) pikeperch are know…
View article: Hungry catfish – effect of prey availability on movement dynamics of a top predator
Hungry catfish – effect of prey availability on movement dynamics of a top predator Open
The availability and spatial distribution of prey determines the energetic costs of predators foraging and largely drives their space use, activity level and foraging timing. Consequently, predators in ecosystems with different prey availa…
View article: Spatial fish distribution in autumn in a shallow mesotrophic lake, assessed by hydroacoustic surveys, trawling, and beach seining
Spatial fish distribution in autumn in a shallow mesotrophic lake, assessed by hydroacoustic surveys, trawling, and beach seining Open
Day and nighttime autumn fish abundance and biomass were studied in the pelagic and littoral zones of Lake Sauka in Latvia. Both pelagic methods (hydroacoustics and trawling) revealed significantly higher fish abundance and biomass during …
View article: A non-lethal stable isotope analysis of valued freshwater predatory fish using blood and fin tissues as alternatives to muscle tissue
A non-lethal stable isotope analysis of valued freshwater predatory fish using blood and fin tissues as alternatives to muscle tissue Open
Stable isotope analysis (SIA) is widely used to study trophic ecology and food webs in aquatic ecosystems. In the case of fish, muscle tissue is generally preferred for SIA, and the method is lethal in most cases. We tested whether blood a…
View article: Readability of Fin Clipping during the Growing Season: Case Study on the Pikeperch (<i>Sander lucioperca</i>)
Readability of Fin Clipping during the Growing Season: Case Study on the Pikeperch (<i>Sander lucioperca</i>) Open
Fin clipping is a common method of fish marking to distinguish between particular cohorts, yet a comparison of specific marks/clips has yet to be thoroughly conducted. Nine ponds were stocked with pikeperch ( Sander lucioperca , L., 20 spe…
View article: Trophic Position of the Species and Site Trophic State Affect Diet Niche and Individual Specialization: From Apex Predator to Herbivore
Trophic Position of the Species and Site Trophic State Affect Diet Niche and Individual Specialization: From Apex Predator to Herbivore Open
Intra-species variability in isotopic niches, specifically isotopic total niche width (ITNW), isotopic individual niche width (IINW), and isotopic individual specialization (IIS), was studied using an innovative approach without sacrificin…
View article: The effect of littoral complexity on the diel distribution of early juvenile fish communities in temperate freshwater reservoirs
The effect of littoral complexity on the diel distribution of early juvenile fish communities in temperate freshwater reservoirs Open
The diel distribution of early juvenile fish communities from two temperate freshwater reservoirs that differed in cover of submerged aquatic vegetation was investigated. In the daytime, about 99.9% of the juvenile fish community from the …
View article: High Mobility and Flexibility in the Habitat Use of Early Juvenile Pikeperch (Sander lucioperca) Based on a Mark-Recapture Experiment
High Mobility and Flexibility in the Habitat Use of Early Juvenile Pikeperch (Sander lucioperca) Based on a Mark-Recapture Experiment Open
Disentangling the role of factors responsible for juvenile fish dispersal is essential to understand the ecology of individual species, setting the corresponding conservation status and evaluating the potential risk in case of invasion. Be…
View article: Calibration of fish biomass estimates from gillnets: Step towards broader application of gillnet data
Calibration of fish biomass estimates from gillnets: Step towards broader application of gillnet data Open
Fish are an important component of aquatic ecosystems, thus representative and reliable assessments of their population variables are essential for a variety of ecological applications, management and conservation. Determining Fish Density…
View article: Distribution patterns, annual density changes, growth and mortality of pikeperch [<i>Sander lucioperca</i> (L. 1758)] fry following oligotrophication of a reservoir
Distribution patterns, annual density changes, growth and mortality of pikeperch [<i>Sander lucioperca</i> (L. 1758)] fry following oligotrophication of a reservoir Open
Until 2006, the Lipno Reservoir had the largest catches of pikeperch in the Czech Republic, but since 2007 it has partially collapsed. This collapse was preceded by oligotrophication, when phosphorus concentrations declined by 25%. Conserv…
View article: Trophic position of the species and site trophic state affect diet niche and individual specialization: from apex predator to herbivore
Trophic position of the species and site trophic state affect diet niche and individual specialization: from apex predator to herbivore Open
Intra-species variability in a diet niche, specifically total niche width (TNW), individual niche width (INW), and individual specialization (IS), was studied using an innovative approach without sacrificing the animals. Stable isotopes ( …
View article: Long-term monitoring of fish in a freshwater reservoir: Different ways of weighting complex spatial samples
Long-term monitoring of fish in a freshwater reservoir: Different ways of weighting complex spatial samples Open
Anthropogenic activities continue to pose the greatest challenges to freshwater ecosystems. Therefore, long-term monitoring is essential for the management and conservation of these resources. Monitoring programs for freshwater bodies ofte…
View article: Different hosts in different lakes: prevalence and population genetic structure of plerocercoids of Ligula intestinalis (Cestoda) in Czech water bodies
Different hosts in different lakes: prevalence and population genetic structure of plerocercoids of Ligula intestinalis (Cestoda) in Czech water bodies Open
Ligula intestinalis (Linnaeus, 1758) is a tapeworm parasite with a worldwide distribution that uses a wide variety of fish species as its second intermediate host. In the present study, we investigated the prevalence and population genetic…
View article: Similarities and Differences in Fish Community Composition Accessed by Electrofishing, Gill Netting, Seining, Trawling, and Water eDNA Metabarcoding in Temperate Reservoirs
Similarities and Differences in Fish Community Composition Accessed by Electrofishing, Gill Netting, Seining, Trawling, and Water eDNA Metabarcoding in Temperate Reservoirs Open
It is difficult to understand the composition and diversity of biological communities in complex and heterogeneous environments using traditional sampling methods. Recently, developments in environmental DNA metabarcoding have emerged as a…
View article: Dynamics of the habitat use of three predatory freshwater fish in a lentic ecosystem
Dynamics of the habitat use of three predatory freshwater fish in a lentic ecosystem Open
To understand the conditions of coexistence in multiple-species predator community, we studied longitudinal and vertical movement of pike ( Esox lucius ), pikeperch ( Sander lucioperca ) and catfish ( Silurus glanis ) in the Římov Reservoi…