Fish activity as determined by gillnet catch: A comparison of two reservoirs of different turbidity

Prchalová, Marie; Mrkvička, Tomáš; Kubečka, Jan; Peterka, Jiří; Čech, Martin; Kratochvíl, Michal; Vašek, Mojmír

doi:10.1016/j.fishres.2009.12.011

Cited by 59 publications

(48 citation statements)

References 23 publications

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“…Nevertheless, a steady increase in fullness in the second and third parts of their guts (Table 5) suggests that intensive feeding takes place before nightfall. This finding agrees with the studies of Vašek & Kubečka (2004) and Prchalová et al (2010). The former has shown that fish activity is highest during the twilight periods in the reservoir and the latter also documented the highest feeding rate during these periods and did not observe any feeding activity at night for subadults of these species that were captured in the pelagic zone of the reservoir.…”

Section: Discussionsupporting

confidence: 92%

Patterns in diel habitat use of fish covering the littoral and pelagic zones in a reservoir

et al. 2014

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We investigated diel habitat use of fish covering the littoral and pelagic zones of the Ř ímov Reservoir (Czech Republic) and analyzed the influence of predator presence and of shifting feeding habitats in all dominant species and age groups. Our sampling revealed distinctive diel changes of fish distribution in the reservoir, which were age-and species-dependent. The overall abundance of subadult fish in littoral habitats was significantly higher at night than during the daytime. Subadults were almost absent in pelagic habitat during the day and their presence increased during the night, although densities were smaller than in the littoral. Adults preferred the pelagic zone during the day and partly migrated to the littoral at night. Potential fish predators were most likely responsible for small fish avoidance of the littoral and pelagic zones during day. Higher availability of food in the littoral was the most important driver of the high occurrence of subadults at night. Day preference of pelagic zone by adults is most likely caused by higher profitability of this habitat in comparison with littoral. The reasons for night inshore migration of adults are not obvious, but the homogenization of their distribution or resting in the littoral could explain such behavior.

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Section: Discussionsupporting

confidence: 92%

Patterns in diel habitat use of fish covering the littoral and pelagic zones in a reservoir

et al. 2014

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“…normalized fish activity modeled by Prchalová et al (2010) i state of the process of the catch i u final state of the process of the catch i s initial state of the process of the catch M maximal catch of the standardized benthic gillnet (12 mesh sizes in the range of 5-55 mm, knot to knot, height 1.5 m, length 30 m, area 45 m 2 ; CEN, 2005) p probability of the fish catch s time at the beginning of catching T weight increment t time in general u time when the catch ends W average weight of fish in a waterbody (g) size of 16 mm). Minns and Hurley (1988) suggested that gillnet saturation can certainly occur during a single night, although this statement may be confounded by the varying behaviors of the fish species present.…”

Section: Introductionmentioning

confidence: 99%

“…We wanted to separate the effects of fish activity and saturation from the gillnet catch to get a corrected catch, termed the catchable biomass rate (i.e., the weight of fish that can be caught within an hour by an empty gillnet during a period of unitary fish activity) in this paper. We described fish activity as determined by a gillnet catch in our previous study (Prchalová et al, 2010) and concluded that this activity pattern can be applied in all fish communities where fish species have activity peaks during dusk and dawn. We expected that gillnet saturation would be rather constant among various bodies of water because we consider it to be a mechanical phenomenon.…”

Section: Introductionmentioning

confidence: 99%

A model of gillnet catch in relation to the catchable biomass, saturation, soak time and sampling period

et al. 2011

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“…At each locality and depth, three nets were deployed at a distance of 60 m and were handled separately as independent samples with all mesh sizes together. All gillnets were set before sunset and were lifted after sunrise to cover maximal peaks of fish activity (Prchalová et al, 2010).…”

Section: Samplingmentioning

confidence: 99%

A simple fish-based approach to assess the ecological quality of freshwater reservoirs in Central Europe

Blabolil

Říha

Ricard

et al. 2017

Knowl. Manag. Aquat. Ecosyst.

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-The assessment of ecological quality in freshwater ecosystems is a key issue in many countries, but conditions for the development of assessment methodologies are often country-specific. This study proposes a simple methodology for the assessment of the ecological potential of reservoirs based on fish communities using a dataset covering major environmental and pressure gradients in reservoirs in the Czech Republic. Fish data obtained by gillnet sampling were correlated with a proxy of eutrophication as a key indicator of anthropogenic pressure for selecting appropriate fish-based indicators, establishing scoring criteria and developing the index of ecological quality. Expert judgement was also used to select potential fish indicators. Nine indicators were selected for the final fish-based index, fulfilling the criteria required by the Water Framework Directive. Two steps were used to validate the fish-based index quantification of its inter annual stability and sensitivity analysis of individual indicators. Finally, the index was compared to a previously developed general index for Central and Western Europe. Our study demonstrates that a combination of expert judgement and strict validation methods can result in an informative assessment of the ecological conditions, which can help identify conservation and restoration priorities.

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Fish activity as determined by gillnet catch: A comparison of two reservoirs of different turbidity

Cited by 59 publications

References 23 publications

Patterns in diel habitat use of fish covering the littoral and pelagic zones in a reservoir

Patterns in diel habitat use of fish covering the littoral and pelagic zones in a reservoir

A model of gillnet catch in relation to the catchable biomass, saturation, soak time and sampling period

A simple fish-based approach to assess the ecological quality of freshwater reservoirs in Central Europe

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