Two female barbel Rurbus barhu.c (L.) werc taggcd with implantable radio transmitters and tracked in thc Ourthe River (Southern Helgium) from April 12th to July 7th, 1989 to study their movements and activity rhythms during thc spring-summer pcriod. Both barbcls defined a 1.6 km home rangc and occupicd four residencc arcas. Greatest avcrage daily movcmcnts within thc home range limits occurrcd during the prcspawning and spawning periods and were associatcd with variations of mean daily water tempcrature and level. Barbel 2 made a 9.6 km excursion from its spring home range and homed a wcck later in its rcsidcnce area. Barbcls displayed dusk and dawn activity patterns, characterized by the occupation of riffle areas. The activity timing was found to be dependcnt on water tcmperature whilc the size of daily activity area was more influenccd by river flow conditions.
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