The influence of the trawl mouth opening size and net colour on catch efficiency during sampling of early stages of perch (Perca fluviatilis) and pikeperch (Sander lucioperca) in the bathypelagic layer of a canyon-shaped reservoir

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F12%3A00377843" target="_blank" >RIV/60077344:_____/12:00377843 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60076658:12310/12:43883556

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.fishres.2011.11.014" target="_blank" >http://dx.doi.org/10.1016/j.fishres.2011.11.014</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.fishres.2011.11.014" target="_blank" >10.1016/j.fishres.2011.11.014</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The influence of the trawl mouth opening size and net colour on catch efficiency during sampling of early stages of perch (Perca fluviatilis) and pikeperch (Sander lucioperca) in the bathypelagic layer of a canyon-shaped reservoir

Popis výsledku v původním jazyce

The efficiency of different sized (0.5x2, 1x2, 2x2, 4x2 m) and coloured (black, white) ichthyoplankton trawl nets was investigated during daytime in the bathypelagic layer of the Římov Reservoir (Czech Republic) in late May 2008. Eight to 16 mm long perch (Perca fluviatilis) and pikeperch (Sander lucioperca) fry were the dominant species in fry catches in this layer. We did not find any significant differences between the densities of either species when black and white nets were compared or when different sized nets were compared. Neither were there any significant differences in body lengths of the fish caught in the different trawls. Our results indicate that both perch and pikeperch fry in the bathypelagic layer are quite passive, without observable avoidance behaviour to the ichthyoplankton trawl nets. This is in contrast to active avoidance of the same species and sizes previously observed in the epipelagic layer.

Název v anglickém jazyce

The influence of the trawl mouth opening size and net colour on catch efficiency during sampling of early stages of perch (Perca fluviatilis) and pikeperch (Sander lucioperca) in the bathypelagic layer of a canyon-shaped reservoir

Popis výsledku anglicky

The efficiency of different sized (0.5x2, 1x2, 2x2, 4x2 m) and coloured (black, white) ichthyoplankton trawl nets was investigated during daytime in the bathypelagic layer of the Římov Reservoir (Czech Republic) in late May 2008. Eight to 16 mm long perch (Perca fluviatilis) and pikeperch (Sander lucioperca) fry were the dominant species in fry catches in this layer. We did not find any significant differences between the densities of either species when black and white nets were compared or when different sized nets were compared. Neither were there any significant differences in body lengths of the fish caught in the different trawls. Our results indicate that both perch and pikeperch fry in the bathypelagic layer are quite passive, without observable avoidance behaviour to the ichthyoplankton trawl nets. This is in contrast to active avoidance of the same species and sizes previously observed in the epipelagic layer.

Druh

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

CEP obor

EH - Ekologie – společenstva

OECD FORD obor

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Projekt

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

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2012

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

123

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

5

Strana od-do

21-25

Kód UT WoS článku

000304222800005

EID výsledku v databázi Scopus

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