Movements of barbel, Barbus barbus (Pisces: Cyprinidae)
2002
Penaz, M. | Barus, V. | Prokes, M. | Homolka, M. (Akademie Ved, Brno (Czech Republic). Ustav Biologie Obratlovcu)
Altogether 701 adult barbel, Barbus barbus, were captured by electrofishing and individually tagged to study their local displacement and movements in a stretch of the river Jihlava (Czech Republic). A total of 149 fish were recaptured and 105 of them (70.47 %) were considered as "resident" because they were always recaptured in the same, relatively restricted (250-780 m) stream section which always contained a pool. The remaining 44 recaptured specimens belonged to the "mobile", their movements encompassing at maximum 1,680 m downstream or 2,020 upstream. The propotion of mobile barbel increased in the largest size classes (451-550 mm of SL). The extent of movements and corresponding proportion of mobile fish appear to be increasing with diminishing habitat patchiness. In the stretch of the river studied, with a rich patchy heterogenous habitat and well developed riffle-pool-raceway structure, each section (pool) can be considered as a more or less isolated spatial unit containing its own, and in a certain degree, isolated component of a metapopulation.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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