Effect of river fragmentation and flow regulation on occurrence of landlocked brown trout in a fish ladder
Identifieur interne : 000600 ( Main/Exploration ); précédent : 000599; suivant : 000601Effect of river fragmentation and flow regulation on occurrence of landlocked brown trout in a fish ladder
Auteurs : O. Slavík [République tchèque] ; L. Bartoš [République tchèque] ; P. Hork [République tchèque]Source :
- Journal of Applied Ichthyology [ 0175-8659 ] ; 2009-02.
Abstract
The movement pattern of brown trout Salmo trutta (L.) in a fish ladder on the heavily fragmented Ohře River, Czech Republic was observed for 16 months. Some individually‐tagged fish repeatedly occurred in the ladder. A total of 1640 fish represented captures of 595 S. trutta in the fish ladder; 247 fish were caught once and 348 individuals were caught repeatedly. Repeatedly‐caught (348) individuals represented 1393 (84.9%) of the 1640 captures. The likelihood of repetitive occurrence decreased with the increase in fish body length. The number of individuals in the ladder was inversely related to temperature, and positively correlated with increasing water flow in the main channel. Fish abundance in the ladder was density‐dependent, as the number of individuals was inversely related to fish size and time of residency in the ladder. Spawning migrations were not the best predictor of maximum fish occurrence in the ladder, suggesting that repetitive capture of individuals in the ladder was significantly affected by other factors influencing fish behaviour. Repetitive fish occurrence in ladders can be expected, particularly in rivers with numerous lateral obstructions.
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DOI: 10.1111/j.1439-0426.2008.01164.x
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Hork</name><affiliation wicri:level="3"><country>République tchèque</country><placeName><settlement type="city">Prague</settlement><region type="région" nuts="2">Bohême centrale</region></placeName><wicri:orgArea>T G M – Water Research Institute</wicri:orgArea></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Applied Ichthyology</title><idno type="ISSN">0175-8659</idno><idno type="eISSN">1439-0426</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2009-02">2009-02</date><biblScope unit="volume">25</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="67">67</biblScope><biblScope unit="page" to="72">72</biblScope></imprint><idno type="ISSN">0175-8659</idno></series><idno type="istex">A755D41CA78278592EB72FFBE281288CAA938608</idno><idno type="DOI">10.1111/j.1439-0426.2008.01164.x</idno><idno type="ArticleID">JAI1164</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0175-8659</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The movement pattern of brown trout Salmo trutta (L.) in a fish ladder on the heavily fragmented Ohře River, Czech Republic was observed for 16 months. Some individually‐tagged fish repeatedly occurred in the ladder. A total of 1640 fish represented captures of 595 S. trutta in the fish ladder; 247 fish were caught once and 348 individuals were caught repeatedly. Repeatedly‐caught (348) individuals represented 1393 (84.9%) of the 1640 captures. The likelihood of repetitive occurrence decreased with the increase in fish body length. The number of individuals in the ladder was inversely related to temperature, and positively correlated with increasing water flow in the main channel. Fish abundance in the ladder was density‐dependent, as the number of individuals was inversely related to fish size and time of residency in the ladder. Spawning migrations were not the best predictor of maximum fish occurrence in the ladder, suggesting that repetitive capture of individuals in the ladder was significantly affected by other factors influencing fish behaviour. Repetitive fish occurrence in ladders can be expected, particularly in rivers with numerous lateral obstructions.</div></front></TEI><affiliations><list><country><li>République tchèque</li></country><region><li>Bohême centrale</li></region><settlement><li>Prague</li></settlement></list><tree><country name="République tchèque"><region name="Bohême centrale"><name sortKey="Slavik, O" sort="Slavik, O" uniqKey="Slavik O" first="O." last="Slavík">O. Slavík</name></region><name sortKey="Bartos, L" sort="Bartos, L" uniqKey="Bartos L" first="L." last="Bartoš">L. Bartoš</name><name sortKey="Hork, P" sort="Hork, P" uniqKey="Hork P" first="P." last="Hork">P. Hork</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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