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Titre :
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Biologie de la perche (Perca fluviatilis) dans le réservoir du Mirgenbach (Cattenom, Moselle)
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Titre original:
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Biology of the perch (Perca fluviatilis) in the Mirgenbach reservoir (Cattenom, Moselle)
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Auteurs :
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A. Flesch ;
UNIVERSITE METZ ;
CREUM
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Type de document :
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thèse/mémoire
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Année de publication :
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1994
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Format :
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231 p. + annexes
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Note générale :
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Diffusion tous publics
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Langues:
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= Français
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Catégories :
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AQUACULTURE
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Mots-clés:
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BIOLOGIE
;
RESERVOIR
;
REPRODUCTION
;
PERCA FLUVIATILIS
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Résumé :
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The Mirgenbach Reservoir created by pumping water from the river Moselle in 1985 is a safety reservoir and a buffer zone for the Cattenom nuclear power plant (Moselle, North-East France). With its maximum depth of 20 meters, this reservoir is characterized by its heated waters and the abscence of a thermo-stratification. It is an ecological study of this lake-reservoir which contributes to the knowledge of the fish population and the demography of an initially dominant species : the perch, Perca fluviatilis. From 1987 to 1991, various fishing techniques were employed on the Mirgenbach lake-reservoir. Two kinds of gill nets were used : traditional nets and vertical ones which took samples from the water surface to the bottom. A set of vertical nets were immersed in stations during fishing sessions spread along the year. Among the various fishing gears used, vertical gill nets turned out to the best sampling device for the analysis of the perch demography.The analysis of catches thanks to these various fishing gears enabled us to know its location and its evolution in the lake-reservoir. All in all, 18 fish species were identified with a majority of perch (Perca fluviatilis), roach (Rutilus rutilus) and common bream (Abramis brama). The multiple correspondence analysis led us to distinguish several groups of stations, each having its own species. The sampled fish with traditional and vertical gill nets as well as angling enabled us to know the selectivity of cach device and to study the demographic structure evolution.The number of catches has decreased dramatically within this period. The seasonal repartition of the species in the reservoir was studied is an annual cycle with vertical gill nets. The best catches of this carnivorous fish were made in summer, except in a littoral station close to a spawning area before reproduction period. The vertical distribution of this species varies according to bathymetry. The perches were found mostly at the bottom of the stations closest to the shore and from the bottom to the surface in the pelagic stations.
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Diplôme :
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Doctorat Science de la Vie, Université Metz, 12 septembre 1994
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