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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

EH - Ecology - communities

OECD FORD branch

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Project

<a href="/en/project/GBP505%2F12%2FG112" target="_blank" >GBP505/12/G112: ECIP - European Centre of Ichtyoparasitology</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Name of the periodical

Fisheries Research

ISSN

0165-7836

e-ISSN

—

Volume of the periodical

173

Issue of the periodical within the volume

1

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

8

Pages from-to

101-108

UT code for WoS article

000367774000014

EID of the result in the Scopus database

2-s2.0-84949316459