. . "285;290" . . . "0165-7836" . . . "419350" . "The efficiency of three fry trawls for sampling the freshwater pelagic fry community"@en . "The efficiency of three fry trawls for sampling the freshwater pelagic fry community" . . "\u00DAnikov\u00E9 reakce spole\u010Denstev tohoro\u010Dn\u00EDch ryb byly sledov\u00E1ny ve voln\u00E9 vod\u011B t\u0159ech n\u00E1dr\u017E\u00ED v \u010Cesk\u00E9 republice v pr\u016Fb\u011Bhu l\u00E9ta. Na ka\u017Ed\u00E9 n\u00E1dr\u017Ei byly pou\u017Eity t\u0159i traly o r\u016Fzn\u00E9 \u0161\u00ED\u0159ce v pr\u016Fb\u011Bhu noci. Denn\u00ED \u00FAlovky byly mnohem ni\u017E\u0161\u00ED ve srovn\u00E1n\u00ED s no\u010Dn\u00EDmi. Dosp\u011Bl\u00E9 ryby vykazovaly jasn\u00E9 \u00FAnikov\u00E9 reakce p\u0159ed pl\u016Fdkov\u00FDmi traly. V noci nebyly zaznamen\u00E1ny statisticky pr\u016Fkazn\u00E9 rozd\u00EDly v dosa\u017Een\u00E9 denzit\u011B pl\u016Fdku pro tyto traly a to na \u017E\u00E1dn\u00E9 lokalit\u011B pro \u017E\u00E1dn\u00FD druh a neli\u0161ily se ani d\u00E9lky t\u011Bla hojn\u00FDch druh\u016F mezi jednotliv\u00FDmi traly. Vzhledem k t\u011Bmto v\u00FDsledk\u016Fm jsou \u00FAnikov\u00E9 reakce pl\u016Fdku v noci v pozdn\u00EDm l\u00E9t\u011B bezv\u00FDznamn\u00E9. V tomto obdob\u00ED roku se no\u010Dn\u00ED pelagick\u00E9 tralov\u00E1n\u00ED jev\u00ED b\u00FDt zcela efektivn\u00ED metodou pro kvantitativn\u00ED vzorkov\u00E1n\u00ED pl\u016Fdku. Doporu\u010Dujeme proto 3x3m tral pro kvantitativn\u00ED no\u010Dn\u00ED vzorkov\u00E1n\u00ED pl\u016Fdkov\u00FDch spole\u010Denstev jako dobr\u00FD kompromis mezi zaji\u0161t\u011Bnou \u00FA\u010Dinnost\u00ED a relativn\u011B snadn\u00FDm zach\u00E1zen\u00EDm s tralem t\u00E9to velikosti."@cs . "NL - Nizozemsko" . "J\u016Fza, Tom\u00E1\u0161" . . . . . "The efficiency of three fry trawls for sampling the freshwater pelagic fry community" . . "RIV/60077344:_____/07:00087271!RIV08-AV0-60077344" . "\u00DA\u010Dinnost t\u0159\u00ED pl\u016Fdkov\u00FDch tral\u016F p\u0159i vzorkov\u00E1n\u00EDch sladkovodn\u00EDch pelagick\u00FDch pl\u016Fdkov\u00FDch spole\u010Denstev"@cs . "2"^^ . . "[EB783A0C5F1B]" . "2"^^ . . . . . "Kube\u010Dka, Jan" . "85" . "RIV/60077344:_____/07:00087271" . "juvenile fish; trawl efficiency; avoidance reactions"@en . . . "3" . "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." . . "P(1QS600170504), P(IAA600170502), V, Z(AV0Z60170517)" . "The efficiency of three fry trawls for sampling the freshwater pelagic fry community"@en . "\u00DA\u010Dinnost t\u0159\u00ED pl\u016Fdkov\u00FDch tral\u016F p\u0159i vzorkov\u00E1n\u00EDch sladkovodn\u00EDch pelagick\u00FDch pl\u016Fdkov\u00FDch spole\u010Denstev"@cs . "Fisheries Research" . "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."@en . "6"^^ .