About: Hydroacoustic estimates of fish stocks in temperate reservoirs: day or night surveys?

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Day and night acoustic surveys were used to compare fish stock estimates at eight European reservoirs and one flooded mining pit. During both photoperiods of summer, higher fish biomass was observed in the uppermost 4 m of the water column by horizontal beaming than in deeper water by vertical beaming. Comparisons of volume backscattering coefficient (sv), fish biomass (kg ha(-1)), abundance (ind. ha(-1)) and average fish weight (g) did not show a common pattern among the reservoirs but were found to vary significantly across photoperiods. At most reservoirs, the night surveys had higher estimates than day surveys. However, at several reservoirs the opposite pattern was observed. These patterns could not be explained by the species composition of the fish stocks. Fish size distributions were found to be different between day and night. A higher proportion of 1+ and older fish were found during the night at two of three studied waterbodies. In general, it was not possible to decide whether day or night Day and night acoustic surveys were used to compare fish stock estimates at eight European reservoirs and one flooded mining pit. During both photoperiods of summer, higher fish biomass was observed in the uppermost 4 m of the water column by horizontal beaming than in deeper water by vertical beaming. Comparisons of volume backscattering coefficient (sv), fish biomass (kg ha(-1)), abundance (ind. ha(-1)) and average fish weight (g) did not show a common pattern among the reservoirs but were found to vary significantly across photoperiods. At most reservoirs, the night surveys had higher estimates than day surveys. However, at several reservoirs the opposite pattern was observed. These patterns could not be explained by the species composition of the fish stocks. Fish size distributions were found to be different between day and night. A higher proportion of 1+ and older fish were found during the night at two of three studied waterbodies. In general, it was not possible to decide whether day or night (en)
Title	Hydroacoustic estimates of fish stocks in temperate reservoirs: day or night surveys? Hydroacoustic estimates of fish stocks in temperate reservoirs: day or night surveys? (en)
skos:prefLabel	Hydroacoustic estimates of fish stocks in temperate reservoirs: day or night surveys? Hydroacoustic estimates of fish stocks in temperate reservoirs: day or night surveys? (en)
skos:notation	RIV/60076658:12310/09:00010505!RIV10-MSM-12310___
http://linked.open...avai/riv/aktivita	P V Z
http://linked.open...avai/riv/aktivity	P(1QS600170504), P(GA206/06/1371), P(GA206/07/1392), V, Z(AV0Z60170517)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2010
http://linked.open...aciTvurceVysledku	Kubečka, Jan Mrkvička, Tomáš Matěna, Josef Peterka, Jiří Říha, Milan Jůza, Tomáš Čech, Martin
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Jihočeská univerzita v Českých Budějovicích / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	318132
http://linked.open...ai/riv/idVysledku	RIV/60076658:12310/09:00010505
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Hydroacoustics; Fish biomass; Diel migration; Man-made lake (en)
http://linked.open.../riv/klicoveSlovo	Diel migration Fish biomass Hydroacoustics Man-made lake
http://linked.open...odStatuVydavatele	FR - Francouzská republika
http://linked.open...ontrolniKodProRIV	[9C6ABA579090]
http://linked.open...i/riv/nazevZdroje	Aquatic Living Resources
http://linked.open...in/vavai/riv/obor	EG
http://linked.open...ichTvurcuVysledku	7 (xsd:int)
http://linked.open...cetTvurcuVysledku	14 (xsd:int)
http://linked.open...vavai/riv/projekt	Patterns and reasons of different pelagic behaviour of perch fry: novel insight into the declared ecological plasticity of a species Limnological basis of sustainable management of reservoirs Horizontal acoustic surveys and fish behaviour in the open water
http://linked.open...UplatneniVysledku	2009
http://linked.open...v/svazekPeriodika	22
http://linked.open...iv/tvurceVysledku	Kubečka, Jan Mrkvička, Tomáš Peterka, Jiří Prchalová, Marie Čech, Martin Frouzová, Jaroslava Matěna, Josef Jůza, Tomáš Kratochvíl, Michal Tušer, Michal Vašek, Mojmír Říha, Milan Jarolím, Oldřich Draštík, V.
http://linked.open...ain/vavai/riv/wos	000265079800008
http://linked.open...n/vavai/riv/zamer	Struktura, funkce a vývoj vodních ekosystémů
issn	0990-7440
number of pages	9 (xsd:int)
http://localhost/t...ganizacniJednotka	12310

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