Within the frame of the ichthyological survey of the Malše River in Dolní Dvořiště and several river profiles upstream the Kaplice town the presence of brook lamprey (Lampetra planeri) was proved. In years 2007-2009 in six localities of the Malše River between Dolní Dvořiště and Kaplice town the occurrence of the species was proved. Lamprey larvae created more than 90%, catch of adult lampreys was low. In time period investigated the densities were relatively low (8 inds./m2 maximally) and were not significantly different between compared years and localities sampled. Lampreys densities were influenced by current speed and rate of shade. Physical {--} chemical parameters of water (temperature, pH, oxygen concentration, conductivity) and also water depth and thickness of sediment were in the range of optimal values in the sampled microhabitats so any correlations between these parameters and densities of lampreys were not observed.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:50213 |
| Date | January 2010 |
| Creators | BRABCOVÁ, Miroslava |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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