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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
Využití umělých třecích substrátů za účelem porozumění vlivům, které ovlivňují výběr třecí lokality, hloubku uložení jikrných pásů a třecí periodu okouna říčního (Perca fluviatilis L.)
 VEJŘÍK, Lukáš
The distribution of egg strands of perch was studied in Chabařovice Lake, Czech Republic, using areas with an artificial spawning substrate. It was found that egg strands were deposited in deeper and colder water in dependence on the duration of the daylight period. At the end of the spawning season, egg strands were deposited in deep and cold water where larvae development is very slow. For this reason the latest larvae are present a month and half later than the first perch larvae. Perch have evolved a powerful mechanism to protect their population against the vagaries of the weather and temporary bad biological conditions in the lake.
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