Highly Eutrophicated Fishponds - Effect of the Past Nutrient Input and Current High Fishstock - Results Of 20 Years Monitoring.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F25173154%3A_____%2F15%3A%230000431" target="_blank" >RIV/25173154:_____/15:#0000431 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/25173154:_____/15:N0000003

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Highly Eutrophicated Fishponds - Effect of the Past Nutrient Input and Current High Fishstock - Results Of 20 Years Monitoring.

Popis výsledku v původním jazyce

Proceeding in: SEFS 9 - Symposium for European Freshwater Sciences. Abstract book. Geneva, Switzerland. s. 512. For centuries, more than 20 000 fishponds (man ?made shallow lakes) of size <1ha to 490ha form important hydrological system of the inland country - Czech Republic. During the 20th century, most of fishponds became eu- to hypertrophic both due to external nutrient loading (agriculture run off, municipal waste water) and fishery management (fertilizing, additional feeding). Fish stock and production rose and fish yield reached 1000kg/ha and even more. Mean concentrations of total nitrogen and phosphorus increased form less than 1 to 3mg/l and from 0.05 to 0.3 mg/l,respectively. Fertilizing of fishpons was reduced from 1990th. Fertilizing of agriculture fields declined in 1990 th and waste water treatment plants are being constructed. In spite of that fishponds remain heavily eutrophic. High phytoplankton biomass results in reduction of water transparency to less than 0.5m. Siz

Název v anglickém jazyce

Highly Eutrophicated Fishponds - Effect of the Past Nutrient Input and Current High Fishstock - Results Of 20 Years Monitoring.

Popis výsledku anglicky

Proceeding in: SEFS 9 - Symposium for European Freshwater Sciences. Abstract book. Geneva, Switzerland. s. 512. For centuries, more than 20 000 fishponds (man ?made shallow lakes) of size <1ha to 490ha form important hydrological system of the inland country - Czech Republic. During the 20th century, most of fishponds became eu- to hypertrophic both due to external nutrient loading (agriculture run off, municipal waste water) and fishery management (fertilizing, additional feeding). Fish stock and production rose and fish yield reached 1000kg/ha and even more. Mean concentrations of total nitrogen and phosphorus increased form less than 1 to 3mg/l and from 0.05 to 0.3 mg/l,respectively. Fertilizing of fishpons was reduced from 1990th. Fertilizing of agriculture fields declined in 1990 th and waste water treatment plants are being constructed. In spite of that fishponds remain heavily eutrophic. High phytoplankton biomass results in reduction of water transparency to less than 0.5m. Siz

Druh

O - Ostatní výsledky

CEP obor

GL - Rybářství

OECD FORD obor

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Projekt

<a href="/cs/project/TE02000077" target="_blank" >TE02000077: Inteligentní Regiony - Informační modelování budov a sídel, technologie a infrastruktura pro udržitelný rozvoj</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

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