Únik ryb před hydroakustickou průzkumnou lodí v mělkých vodách

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F05%3A00006349" target="_blank" >RIV/60076658:12310/05:00006349 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60077387:_____/05:00023529

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Fish avoidance of acoustic survey boat in shallow waters

Popis výsledku v původním jazyce

The avoidance reactions of fish with respect to a survey vessel were studied during horizontal acoustic applications of Simrad EY500 split-beam echosounder (120 kHz) in two lakes (Wallersee, Balaton) and two reservoirs (Orlík, Římov). Three methods wereused to assess the fish avoidance reaction to the surveying vessel:. Comparing acoustic biomass for revealing avoidance reactions is limited. According to the slope of fish movement all fish were divided in two groups: with a positive value of slope (fish swimming away from the transducer) and with a negative slope (fish swimming towards the transducer). Fish avoidance caused higher values of slope. Most avoidance behaviour was found with small fish (target strength, TS < -40 dB, 21 cm) in ranges under10 m. In Czech reservoirs there was found no significant indications of fish avoidance. Much less avoidance behaviour was found with fish bigger then TS > -40 dB. At ranges over 10 m, the avoidance of small boats (5-6 m long, 15-25 HP two

Název v anglickém jazyce

Fish avoidance of acoustic survey boat in shallow waters

Popis výsledku anglicky

The avoidance reactions of fish with respect to a survey vessel were studied during horizontal acoustic applications of Simrad EY500 split-beam echosounder (120 kHz) in two lakes (Wallersee, Balaton) and two reservoirs (Orlík, Římov). Three methods wereused to assess the fish avoidance reaction to the surveying vessel:. Comparing acoustic biomass for revealing avoidance reactions is limited. According to the slope of fish movement all fish were divided in two groups: with a positive value of slope (fish swimming away from the transducer) and with a negative slope (fish swimming towards the transducer). Fish avoidance caused higher values of slope. Most avoidance behaviour was found with small fish (target strength, TS < -40 dB, 21 cm) in ranges under10 m. In Czech reservoirs there was found no significant indications of fish avoidance. Much less avoidance behaviour was found with fish bigger then TS > -40 dB. At ranges over 10 m, the avoidance of small boats (5-6 m long, 15-25 HP two

Druh

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

CEP obor

GL - Rybářství

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2005

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

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Svazek periodika

72

Číslo periodika v rámci svazku

2-3

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

219-228

Kód UT WoS článku

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EID výsledku v databázi Scopus

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