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- Title
Fish drift in a Danube sidearm-system: I. Site-, inter- and intraspecific patterns.
- Authors
Zitek, A.; Schmutz, S.; Unfer, G.; Ploner, A.
- Abstract
A total of 10 649 larval and juvenile fishes of 24 species were caught in the drift at Marchfeldkanal, a man-made side branch of the Danube River near Vienna, Austria, with tubenose gobyProterorhinus marmoratusbeing the dominant species. Distinct differences in inter- and intraspecific drift patterns among different sampling stations along the course of the channel were found. The percentage of the rheophilic and rheoparous ecological guild was highest at the inlet of the channel, where it is directly fed with water from the Danube. For individual species, significant differences in drift densities among sites were found for tubenose goby, barbelBarbus barbus, ideLeuciscus idus, roachRutilus rutilusand for the two most abundant percids, the pike-perchSander luciopercaand zingelZingel zingelcombined. The occurrence of larval and juvenile fishes in the drift was related to certain developmental stages and differed between species and sites. Most species(common breamAbramis brama, bleakAlburnus alburnus, gudgeon speciesGobiospp., chubLeuciscus cephalus, ide and roach) occurred with highest densities at the earliest developmental larval stage, but some species( e.g. common bream and roach) were also found abundantly in drift at later developmental stages. Application of Ivlev‘s index of electivity as a drift index describing the propensity of the different species to drift, yielded the highest indices for the gudgeon species, common bream and bleak and the lowest for perchPerca fluviatilis, Prussian carpCarassius auratus gibelioand ruddScardinius erythrophthalmus.
- Subjects
DANUBE River; EUROPE; FISH populations; FISH larvae distribution; FISH reproduction; FISH communities; DRIFT net fishing; RIVERS
- Publication
Journal of Fish Biology, 2004, Vol 65, Issue 5, p1319
- ISSN
0022-1112
- Publication type
Article
- DOI
10.1111/j.0022-1112.2004.00533.x