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Effects of stream hydraulic conditions on foraging strategies of false dace, Pseudorasbora parva, in the lentic ecosystem.
J Environ Biol ; 2005 Oct; 26(4): 635-43
Article in English | IMSEAR | ID: sea-113384
ABSTRACT
The effects of current velocity on the foraging behavior of false dace, Pseudorasbora parva, were examined in a zero velocity (stagnant) condition, and at four flow rates (5, 7, 11 and 16 cm per second). In stagnant water, the fish displayed a cruise-searching pattern, but they used a drift-feeding foraging tactic in flowing water. The shape of the transverse field of reaction field was elliptical in the stagnant condition, whereas their downward regions were restricted under the flowing conditions. The fish had a blind spot oriented directly in front of their reaction field. Although the relative swimming speed (with considering the against current velocity) increased with increasing flow velocity, the absolute search speed (ignore the against current velocity) showed about 1.2 fish body length per second at stagnant water and low flow velocity. The results of feeding rates showed stop-and wait (driff-feeding) foraging strategy is more efficient in flowing water because prey drift directly towards the fish and prey easily detected.
Subject(s)
Full text: Available Index: IMSEAR (South-East Asia) Main subject: Appetitive Behavior / Video Recording / Water Movements / Cyprinidae / Rivers / Feeding Behavior / Animals Language: English Journal: J Environ Biol Year: 2005 Type: Article

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Full text: Available Index: IMSEAR (South-East Asia) Main subject: Appetitive Behavior / Video Recording / Water Movements / Cyprinidae / Rivers / Feeding Behavior / Animals Language: English Journal: J Environ Biol Year: 2005 Type: Article