Negative effects of undesirable fish on common carp production and overall structure and functioning of fishpond ecosystems.
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F22%3A00556521" target="_blank" >RIV/60077344:_____/22:00556521 - isvavai.cz</a>
Alternative codes found
RIV/60076658:12310/22:43904429 RIV/60076658:12520/22:43904429 RIV/62156489:43210/22:43920776
Result on the web
<a href="https://doi.org/10.1016/j.aquaculture.2021.737811" target="_blank" >https://doi.org/10.1016/j.aquaculture.2021.737811</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.aquaculture.2021.737811" target="_blank" >10.1016/j.aquaculture.2021.737811</a>
Alternative languages
Result language
angličtina
Original language name
Negative effects of undesirable fish on common carp production and overall structure and functioning of fishpond ecosystems.
Original language description
Planktivorous undesirable fish may threaten both fishpond ecosystem functioning and common carp (Cyprinus carpio) farming. The present study revealed a mechanistic understanding of the adverse ecosystem and pro-duction impacts that topmouth gudgeon (Pseudorasbora parva), an invasive omnivorous fish species from Asia, could represent for eutrophic fishponds in South Bohemia (Czechia). In an outdoor experiment conducted under natural conditions, six similar ponds of small size (ca. 1 ha) were similarly stocked with the same size-class common carps (1+ year-old age cohort). Three ponds were additionally stocked with heterogenous size-class of topmouth gudgeon, other three were control ponds (stocked solely with common carp). Our sampling covered one vegetation season from March to September 2020. Environmental parameters, fish and zooplankton assemblage were sampled monthly, while zoobenthos bimonthly (in April, June and August). To assess the potential effect of overall fish predation and its change during the season, we calculated a fish stock index combining fish density and biomass at the time, referred as FSIC for stocked fish (common carp) and FSIU for undesirable fish (topmouth gudgeon). Some tenfold increase in FSIU reflected an overall effect of topmouth gudgeon predation. Significantly (p < 0.05) lower FSIC indeed indicated the adverse effect of topmouth gudgeon on the carp populations compared to the control ponds since August. Our results clearly showed a significant top-down effect of topmouth gudgeon on planktonic crustaceans, especially large Daphnia spp. and other cladoceran species. The complete elimination of cladocerans in the second half of the growing season probably contributed to impaired growth of carp and increased consumption of zoobenthos observed in the undesirable fishponds. Our study suggested indeed that water transparency, often used as a simple indicator of water quality in fishponds, did not correspond well with the ecological status, not even biodiversity, of the fishponds under study. The voracious undesirable fish overexploited zooplankton and significantly out-competed commercially reared common carp, which then switched more to foraging on zoobenthos. Thus, efficient eradicating undesirable fish seems to be a superior tool for overall restoring the eutrophic fishpond ecosystems and improving their ecological status.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
40103 - Fishery
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Aquaculture
ISSN
0044-8486
e-ISSN
1873-5622
Volume of the periodical
549
Issue of the periodical within the volume
Feb
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
9
Pages from-to
737811
UT code for WoS article
000765399200012
EID of the result in the Scopus database
2-s2.0-85120972893