Growth, catches and reproductive biology of ruffe Gymnocephalus cernuus in Lake Piediluco (Umbria, Italy)

The aim of this study was to analyse the growth and reproductive biology of Gymnocephalus in Lake Piediluco, Italy. From June 1999 to March 2002, and between July 2004 and May 2005, 1,330 specimens belonging to seven age-classes were captured. Sex was determined in 385 individuals: 327 females and 5...

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Veröffentlicht in:	Folia zoologica (Brno) 2009-10, Vol.58 (4), p.420
Hauptverfasser:	Lorenzoni, M.,Universita di Perugia (Italy). Dipartimento di Biologia Cellulare e Ambientale, Pace, R.,Universita di Perugia (Italy). Dipartimento di Biologia Cellulare e Ambientale, Pedicillo, G.,Universita di Perugia (Italy). Dipartimento di Biologia Cellulare e Ambientale, Viali, P.,Servizio Ittico-Faunistico, Terni (Italy), Carosi, A.,Servizio Ittico-Faunistico, Terni (Italy)
Format:	Artikel
Sprache:	eng
Schlagworte:	AGE Animal populations Animal reproduction Aquatic ecology Aquatic ecosystems BIOLOGIA PESQUERA BIOLOGICAL DEVELOPMENT BIOLOGIE DES PECHES BODY MEASUREMENTS COMPORTAMIENTO REPRODUCTIVO COMPORTEMENT REPRODUCTIF DATOS SOBRE PESCA DESARROLLO BIOLOGICO DEVELOPPEMENT BIOLOGIQUE DONNEE SUR LES PECHES EDAD ESTRUCTURA DE LA POBLACION FEMALES FEMELLE Fish FISHERY BIOLOGY FISHERY DATA GROWTH RATE GYMNOCEPHALUS CERNUUS HEMBRA http://www.fao.org/aos/agrovoc#c_15969 http://www.fao.org/aos/agrovoc#c_15995 http://www.fao.org/aos/agrovoc#c_16130 http://www.fao.org/aos/agrovoc#c_186 http://www.fao.org/aos/agrovoc#c_2937 http://www.fao.org/aos/agrovoc#c_29788 http://www.fao.org/aos/agrovoc#c_37902 http://www.fao.org/aos/agrovoc#c_4026 http://www.fao.org/aos/agrovoc#c_4160 http://www.fao.org/aos/agrovoc#c_4260 http://www.fao.org/aos/agrovoc#c_42631 http://www.fao.org/aos/agrovoc#c_4945 http://www.fao.org/aos/agrovoc#c_5454 http://www.fao.org/aos/agrovoc#c_6115 http://www.fao.org/aos/agrovoc#c_6510 http://www.fao.org/aos/agrovoc#c_7014 http://www.fao.org/aos/agrovoc#c_8349 http://www.fao.org/aos/agrovoc#c_921 http://www.fao.org/aos/agrovoc#c_980 INDICE DE CRECIMIENTO ITALIA ITALIE ITALY LAC LAGOS LAKES LARGURA LENGTH LONGUEUR MACHO MALE MALES MEDICION DEL CUERPO MENSURATION CORPORELLE MORTALIDAD MORTALITE MORTALITY OVA OVULE OVULO PERFORMANCE DE REPRODUCTION PESO POIDS POPULATION STRUCTURE PROPORCION DE LOS SEXOS REPRODUCTIVE BEHAVIOUR REPRODUCTIVE PERFORMANCE REPRODUCTIVIDAD SEX RATIO STRUCTURE DE LA POPULATION TAUX DE CROISSANCE WEIGHT
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Zusammenfassung:	The aim of this study was to analyse the growth and reproductive biology of Gymnocephalus in Lake Piediluco, Italy. From June 1999 to March 2002, and between July 2004 and May 2005, 1,330 specimens belonging to seven age-classes were captured. Sex was determined in 385 individuals: 327 females and 58 males. Our results showed that in Lake Piediluco ruffe grow as fast as in their original environments. Seasonal growth and back-calculation showed the possible existence of differential mortality prejudicial to small specimens. Moreover, growth analysis revealed market sexual dimorphism in growth in the Lake Piediluco population. Sexual maturation occurred in both sexes at the end of the first year of life. Reproduction occurred mostly in May and June. The mean diameter of eggs was 1.12 mm. The mean number of eggs produced by each female was 11,961 and increased with the size of the specimens.
ISSN:	0139-7893 1573-1189