Negative effects of undesirable fish on common carp production and overall structure and functioning of fishpond ecosystems.

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/60076658:12310/22:43904429 RIV/60076658:12520/22:43904429 RIV/62156489:43210/22:43920776

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Negative effects of undesirable fish on common carp production and overall structure and functioning of fishpond ecosystems.

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Negative effects of undesirable fish on common carp production and overall structure and functioning of fishpond ecosystems.

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

40103 - Fishery

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Aquaculture

ISSN

0044-8486

e-ISSN

1873-5622

Svazek periodika

549

Číslo periodika v rámci svazku

Feb

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

737811

Kód UT WoS článku

000765399200012

EID výsledku v databázi Scopus

2-s2.0-85120972893