Factors affecting migrations of burbot
Identifieur interne : 000021 ( Istex/Curation ); précédent : 000020; suivant : 000022Factors affecting migrations of burbot
Auteurs : O. Slavík [République tchèque] ; L. Bartoš [République tchèque]Source :
- Journal of Fish Biology [ 0022-1112 ] ; 2002-04.
English descriptors
Abstract
In autumn, burbot Lota lota migrations through a fish ladder in the regulated Ohře River, Czech Republic, were stimulated by an increase in discharge and a decrease in water temperature but the number of burbot in the ladder was significantly lower when compared with other seasons. The maximum number of burbot in the ladder was recorded in spring when discharge decreased. A sudden decrease in water level caused burbot to leave the refuges in the riverbanks that they had occupied during high winter discharges. The results indicate that the relatively low short‐term variability of physical conditions represented by the modified discharge regime can induce a stronger response in fish migrations even in comparison with typical reproductive migrations of these species.
Url:
DOI: 10.1111/j.1095-8649.2002.tb02423.x
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<front><div type="abstract" xml:lang="en">In autumn, burbot Lota lota migrations through a fish ladder in the regulated Ohře River, Czech Republic, were stimulated by an increase in discharge and a decrease in water temperature but the number of burbot in the ladder was significantly lower when compared with other seasons. The maximum number of burbot in the ladder was recorded in spring when discharge decreased. A sudden decrease in water level caused burbot to leave the refuges in the riverbanks that they had occupied during high winter discharges. The results indicate that the relatively low short‐term variability of physical conditions represented by the modified discharge regime can induce a stronger response in fish migrations even in comparison with typical reproductive migrations of these species.</div>
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