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Statements

Subject Item
n2:RIV%2F60077344%3A_____%2F13%3A00392325%21RIV14-AV0-60077344
rdf:type
skos:Concept n15:Vysledek
dcterms:description
In lentic freshwater systems, vertical acoustics may underestimate fish abundance in the acoustic dead zone where fish detection capability is limited. To estimate this bias, the height of fish above the lead-line of a benthic multi-mesh gillnet (1.5 m high) was used to quantify both the vertical distribution of fish near the bottom and the proportion residing within the acoustic dead zone. The study was carried out at the percid-dominated Biesbosch Reservoirs in the Netherlands. Acoustic dead zones were estimated at 7 cm above flat bottoms, and 12–34 cm above 8° sloped bottoms at depths of 5–27 m, respectively. Depending on the habitat, 36 to 75% of the gillnet catch by number was present in the acoustic dead zone, representing 5–51% of the biomass. Near-bottom depths were highly preferred by ruffe Gymnocephalus cernua, often used by perch Perca fluviatilis and pikeperch Sander lucioperca, plus seemingly devoid of smelt Osmerus eperlanus. The total amount of fish hidden in the acoustic dead zone was estimated to be 13–39% of the whole water column. The proportion of biomass obscured in the dead zone was lower (1–12%). The conclusion is that undetected fish in the acoustic dead zone can seriously bias density assessment, which can be corrected by concurrent sampling with benthic gillnets. In lentic freshwater systems, vertical acoustics may underestimate fish abundance in the acoustic dead zone where fish detection capability is limited. To estimate this bias, the height of fish above the lead-line of a benthic multi-mesh gillnet (1.5 m high) was used to quantify both the vertical distribution of fish near the bottom and the proportion residing within the acoustic dead zone. The study was carried out at the percid-dominated Biesbosch Reservoirs in the Netherlands. Acoustic dead zones were estimated at 7 cm above flat bottoms, and 12–34 cm above 8° sloped bottoms at depths of 5–27 m, respectively. Depending on the habitat, 36 to 75% of the gillnet catch by number was present in the acoustic dead zone, representing 5–51% of the biomass. Near-bottom depths were highly preferred by ruffe Gymnocephalus cernua, often used by perch Perca fluviatilis and pikeperch Sander lucioperca, plus seemingly devoid of smelt Osmerus eperlanus. The total amount of fish hidden in the acoustic dead zone was estimated to be 13–39% of the whole water column. The proportion of biomass obscured in the dead zone was lower (1–12%). The conclusion is that undetected fish in the acoustic dead zone can seriously bias density assessment, which can be corrected by concurrent sampling with benthic gillnets.
dcterms:title
A simple method to correct the results of acoustic surveys for fish hidden in the dead zone A simple method to correct the results of acoustic surveys for fish hidden in the dead zone
skos:prefLabel
A simple method to correct the results of acoustic surveys for fish hidden in the dead zone A simple method to correct the results of acoustic surveys for fish hidden in the dead zone
skos:notation
RIV/60077344:_____/13:00392325!RIV14-AV0-60077344
n15:predkladatel
n16:ico%3A60077344
n3:aktivita
n6:S n6:P n6:I
n3:aktivity
I, P(QH81046), S
n3:cisloPeriodika
2
n3:dodaniDat
n5:2014
n3:domaciTvurceVysledku
n9:4382870 n9:2839156 n9:8073473 n9:9147683 n9:9148582 n9:5809835 n9:7596693 n9:8391769 n9:7045360 n9:9861408 n9:2133865
n3:druhVysledku
n8:J
n3:duvernostUdaju
n19:S
n3:entitaPredkladatele
n12:predkladatel
n3:idSjednocenehoVysledku
59065
n3:idVysledku
RIV/60077344:_____/13:00392325
n3:jazykVysledku
n13:eng
n3:klicovaSlova
acoustic dead zone; benthic gillnet; freshwater benthic habitats; bottom slope
n3:klicoveSlovo
n4:acoustic%20dead%20zone n4:benthic%20gillnet n4:freshwater%20benthic%20habitats n4:bottom%20slope
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[80113C7D5DC4]
n3:nazevZdroje
Journal of Applied Ichthyology
n3:obor
n10:EH
n3:pocetDomacichTvurcuVysledku
11
n3:pocetTvurcuVysledku
11
n3:projekt
n14:QH81046
n3:rokUplatneniVysledku
n5:2013
n3:svazekPeriodika
29
n3:tvurceVysledku
Peterka, Jiří Frouzová, Jaroslava Mrkvička, Tomáš Jůza, Tomáš Tušer, Michal Draštík, Vladislav Kratochvíl, Michal Čech, Martin Vašek, Mojmír Kubečka, Jan Prchalová, Marie
n3:wos
000316223900008
s:issn
0175-8659
s:numberOfPages
6
n17:doi
10.1111/jai.12091