La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	The intake of wooden debris in running waters - a method for protecting fish stocks against predation by cormorants? (2010)
Auteurs :	Jan Baer, Auteur ; Manuel Konrad, Auteur
Type de document :	Article
Dans :	Vogelwarte (48(1) FEB 2010)
Article en page(s) :	15-20
Langues:	Allemand
Résumé :	The brown trout Salmo trutta stock in a small near-natural tributary of the river Danube was monitored during six consecutive years To protect the local fish community against existing predation by cormorants, after the first year of the study riparian trees were cut down and placed into the river. However, this structural intake had no positive effect for the brown trout stock An increase of the density was only measured after stocking hatchery-reared young brown trout But this increase holds only for a short time, after one winter the former small trout abundance was measured again The main reason for this low density seems to be the high predation rate by cormorants during wintertime Therefore, the intake of wooden debris, even if It is supported by stocking, seems not suitable to guard fish stocks sustainable against predation by cormorants

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...