Use of multiple fish-removal methods during biomanipulation of a drinking water reservoir – Evaluation of the first four years

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081766%3A_____%2F16%3A00451424" target="_blank" >RIV/68081766:_____/16:00451424 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.fishres.2015.04.012" target="_blank" >http://dx.doi.org/10.1016/j.fishres.2015.04.012</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.fishres.2015.04.012" target="_blank" >10.1016/j.fishres.2015.04.012</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Use of multiple fish-removal methods during biomanipulation of a drinking water reservoir – Evaluation of the first four years

Popis výsledku v původním jazyce

The improvement of water quality in recreational and drinking water reservoirs has been a main priorityof river basin authorities for some time. One measure commonly applied is biomanipulation, whichaims to improve water quality by adjusting fish community structure. Effective reduction of cypriniddensity, with a resultant increase in filtering zooplankton development, has already proved successfulin many lakes. In this paper, we document progress in a project to evaluate the feasibility and efficiencyof biomanipulation through parallel use of age-selective fish removal and predator stocking to improvewater quality in a 42 ha drinking water reservoir. Between 2009 and 2012, cyprinid and young perch (Percafluviatilis) density was reduced through removal of early-stage planktonophagous fish and perch eggs, along with removal of adult bream (Abramis brama) and roach (Rutilus rutilus) during spawning. Predatoryfish were also stocked to increase juvenile mortality of the target species. As a result, cyprinid biomasswas significantly reduced (ca. 2/3 of adult bream removed; biomass now estimated at <25 kg ha1).This study showed that biomanipulation was successful at the reservoir and that it is a feasible methodfor other water bodies of similar area and depth with suitable capture sites. While reduced cyprinidbiomass has resulted in a continuous increase in zooplankton density and biomass, however, phyto-plankton dynamics appear to be dependent on additional factors such as nutrient input (especiallyphosphorus). Over the coming years, therefore, attention will focus on both external (catchment) andinternal (sediment) nutrient sources, in addition to continuing fish biomanipulation.

Název v anglickém jazyce

Use of multiple fish-removal methods during biomanipulation of a drinking water reservoir – Evaluation of the first four years

Popis výsledku anglicky

The improvement of water quality in recreational and drinking water reservoirs has been a main priorityof river basin authorities for some time. One measure commonly applied is biomanipulation, whichaims to improve water quality by adjusting fish community structure. Effective reduction of cypriniddensity, with a resultant increase in filtering zooplankton development, has already proved successfulin many lakes. In this paper, we document progress in a project to evaluate the feasibility and efficiencyof biomanipulation through parallel use of age-selective fish removal and predator stocking to improvewater quality in a 42 ha drinking water reservoir. Between 2009 and 2012, cyprinid and young perch (Percafluviatilis) density was reduced through removal of early-stage planktonophagous fish and perch eggs, along with removal of adult bream (Abramis brama) and roach (Rutilus rutilus) during spawning. Predatoryfish were also stocked to increase juvenile mortality of the target species. As a result, cyprinid biomasswas significantly reduced (ca. 2/3 of adult bream removed; biomass now estimated at <25 kg ha1).This study showed that biomanipulation was successful at the reservoir and that it is a feasible methodfor other water bodies of similar area and depth with suitable capture sites. While reduced cyprinidbiomass has resulted in a continuous increase in zooplankton density and biomass, however, phyto-plankton dynamics appear to be dependent on additional factors such as nutrient input (especiallyphosphorus). Over the coming years, therefore, attention will focus on both external (catchment) andinternal (sediment) nutrient sources, in addition to continuing fish biomanipulation.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

EH - Ekologie – společenstva

OECD FORD obor

—

Projekt

<a href="/cs/project/GBP505%2F12%2FG112" target="_blank" >GBP505/12/G112: ECIP - Evropské centrum ichtyoparazitologie</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Fisheries Research

ISSN

0165-7836

e-ISSN

—

Svazek periodika

173

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

101-108

Kód UT WoS článku

000367774000014

EID výsledku v databázi Scopus

2-s2.0-84949316459