Účinnost tří plůdkových tralů při vzorkováních sladkovodních pelagických plůdkových společenstev

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F07%3A00087271" target="_blank" >RIV/60077344:_____/07:00087271 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60076658:12310/07:00008798

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

The efficiency of three fry trawls for sampling the freshwater pelagic fry community

Popis výsledku v původním jazyce

Avoidance reactions of YOY fish assemblages were investigated in the offshore zone of three reservoirs in the Czech Republic during late summer. In each reservoir, three trawl nets of different widths were used in the pelagic area at night. Day catches were much lower compared with those taken at night. Adult fish showed very clear avoidance of fry trawls. At night, no statistically significant differences in estimated fry density, obtained by these trawls, were observed in any locality for any fish species, nor in the length distribution of important species between trawls. According to these results, the avoidance reactions of fry in the late summer, at night, are unimportant. At this time of year, nighttime pelagic trawling appears to be an effective method for quantitative fry sampling. We recommend the 3x3m trawl for quantitative night sampling of the fry community as a good compromise between assured efficiency and relatively easy handling.

Název v anglickém jazyce

The efficiency of three fry trawls for sampling the freshwater pelagic fry community

Popis výsledku anglicky

Avoidance reactions of YOY fish assemblages were investigated in the offshore zone of three reservoirs in the Czech Republic during late summer. In each reservoir, three trawl nets of different widths were used in the pelagic area at night. Day catches were much lower compared with those taken at night. Adult fish showed very clear avoidance of fry trawls. At night, no statistically significant differences in estimated fry density, obtained by these trawls, were observed in any locality for any fish species, nor in the length distribution of important species between trawls. According to these results, the avoidance reactions of fry in the late summer, at night, are unimportant. At this time of year, nighttime pelagic trawling appears to be an effective method for quantitative fry sampling. We recommend the 3x3m trawl for quantitative night sampling of the fry community as a good compromise between assured efficiency and relatively easy handling.

Druh

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

CEP obor

EH - Ekologie – společenstva

OECD FORD obor

—

Projekt

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

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2007

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

—

Svazek periodika

85

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

6

Strana od-do

285-290

Kód UT WoS článku

—

EID výsledku v databázi Scopus

—