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Occurrence of Cyprinids in Fish Ladders in Relation to Flow by Ondřej Slavík; Pavel Horký; Luděk Bartoš is a Agricultural and Biological Sciences article available to read on EtoBox.

What is Occurrence of Cyprinids in Fish Ladders in Relation to Flow about?

To analyse the relationship between spawning migrations and flow, cyprinids from ten fish ladders of the Elbe River (Czech Republic) were collected during the period of spawning migrations (April -June) in 1996, 2000 and 2001. Number of species and individuals in the fish ladders increased with increasing flow up to medium values, followed by further decrease during high flows, whilst length of individuals increased with increasing flow. Moreover, occurrence of four the most numerous species (bleak, roach, silver bream and barbel) showed species specific differences in response to flow variability. In early spring, the highest number of bleak in fish ladders occurred during the low flow, whilst later increased with increasing flow. Occurrence of roach and silver bream achieved the maximum during the medium flow values across the whole studied period. In opposite, occurrence of barbel increased with increasing flows during the whole period. Furthermore, it can be assumed that occurrence of fish in ladders was associated not only with spawning migrations but also reflected shifts in local fish distribution in response to flow variability in the main channel.

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Author

Ondřej Slavík; Pavel Horký; Luděk Bartoš

Publisher

Springer Science and Business Media LLC

Published

2009

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)