The avoidance reactions of fish with respect to a survey vessel were studied during horizontal acoustic applications of a Simrad EY500 split-beam echosounder (120 kHz) in two lakes (Wallersee, Balaton) and two reservoirs (Orlík, Římov). Three different method were used: comparing acoustic biomass in different distances from the boat, determination of the fish direction vector and direct acoustic observation of fish behaviour in front of the moving vessel. Most avoidance behaviour was found with small fish at distances under 10 m. Only in the clear lake Wallersee were some indications of avoidance up to a distance of 15m from the survey boat.
Pracoviště
Hydrobiologický ústav (do r. 2005)
Kontakt
Václava Lavičková, lavickova@hbu.cas.cz, Tel.: 387 775 889
Rok sběru
2006
Počet záznamů: 1
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