Annual activity cycle of adult brown trout (Salmo trutta L.): A radio-telemetry study in a small stream of the Belgian Ardenne

peer reviewed ; During a study period of 26 months, twenty trout (26.0-57.0 cm FL; 198-1,685 g) were daily located from 16 to 466 days in a small stream of the Belgian Ardenne, the Aisne stream (tributary of the river Ourthe) in order to characterize their annual pattern of mobility. Daily movements were more frequent and longer during the spawning period (October-December) than at any other time of the year. Upstream migrations (max.: 25 km) generally occurred during October and the first fortnight of November and were triggered by a combination of Variations of water temperature and water le... Mehr ...