<abstract xmlns="http://www.w3.org/1999/xhtml">The ruffe, <italic>Gymnocephalus cernuus</italic> (L.), is considered to be a food competitor with many commercially valuable fishes such as bream, <italic>Abramis brama</italic> (L.), roach, <italic>Rutilus rutilus</italic> (L.), pikeperch, <italic>Sander lucioperca</italic> (L.), and perch, <italic>Perca fluviatilis</italic> L. This paper presents the results of an investigation into the fish community structure of Lake Dusia and the population parameters (morphometry, age, growth, diet) of ruffe as one of the prevailing fish species in the lake. The fish community of Lake Dusia was dominated by ruffe, perch, and roach. The ruffe population constituted 64.1% of the fish community of the lake in relative abundance and 36.8% in biomass. An analysis of the ruffe diet revealed that Gammaridae and Chironomidae were the principal components in all age-classes. The ruffe population was comprised mainly of individuals 3+ and 4+ years of age. The mean total length (TL) of ruffe was 13.39 ± 1.79 cm (minimum-maximum: 6.12-19.93 cm). The growth in length calculated using the von Bertalanffy equation was <italic>Lt</italic> = 21.3[1-e-a161(t-0,335)]. Ruffe growth rates were found to slow as the fish aged. Ruffe growth variations were linked to population density, fish community structure in the water body, abundance of invertebrates (zooplankton and zoobenthos), and type of water body.</abstract>

The ruffe, Gymnocephalus cernuus (L.), is considered to be a food competitor with many commercially valuable fishes such as bream, Abramis brama (L.), roach, Rutilus rutilus (L.), pikeperch, Sander lucioperca (L.), and perch, Perca fluviatilis L. This paper presents the results of an investigation into the fish community structure of Lake Dusia and the population parameters (morphometry, age, growth, diet) of ruffe as one of the prevailing fish species in the lake. The fish community of Lake Dusia was dominated by ruffe, perch, and roach. The ruffe population constituted 64.1% of the fish community of the lake in relative abundance and 36.8% in biomass. An analysis of the ruffe diet revealed that Gammaridae and Chironomidae were the principal components in all age-classes. The ruffe population was comprised mainly of individuals 3+ and 4+ years of age. The mean total length (TL) of ruffe was 13.39 ± 1.79 cm (minimum-maximum: 6.12-19.93 cm). The growth in length calculated using the von Bertalanffy equation was Lt = 21.3[1-e-a161(t-0,335)]. Ruffe growth rates were found to slow as the fish aged. Ruffe growth variations were linked to population density, fish community structure in the water body, abundance of invertebrates (zooplankton and zoobenthos), and type of water body.

Ruffe <italic>(Gymnocephalus Cernuus</italic> L.) Growth and Diet in Lake Dusia (Southern Lithuania)

Division of the Pisciculture, Fisheries Service under the Ministry of Agriculture of the Republic of Lithuania Lelevelio Street 6, Vilnius LT-01102, Lithuania

Fisheries & Aquatic Life

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Ruffe  L.) Growth and Diet in Lake Dusia (Southern Lithuania)

The ruffe, Gymnocephalus cernuus (L.), is considered to be a food competitor with many commercially valuable fishes such as bream, Abramis brama (L.), roach,...

Ruffe (Gymnocephalus Cernuus L.) Growth and Diet in Lake Dusia (Southern Lithuania)

Article Category: Research Paper

Published Online: Jul 15, 2014

Page range: 110 - 119

Received: Apr 26, 2013

Accepted: Feb 04, 2014

DOI: https://doi.org/10.2478/aopf-2014-0010

Keywords
fish diet, growth, age, community, population

© 2014 Archives of Polish Fisheries

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Ruffe (Gymnocephalus Cernuus L.) Growth and Diet in Lake Dusia (Southern Lithuania)

Article Category: Research Paper

Published Online: Jul 15, 2014

Page range: 110 - 119

Received: Apr 26, 2013

Accepted: Feb 04, 2014

DOI: https://doi.org/10.2478/aopf-2014-0010

Keywordsfish diet, growth, age, community, population

© 2014 Archives of Polish Fisheries

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
fish diet, growth, age, community, population