Fish habitat preferences in an artificial reservoir system

摘要

Spatial distribution of fish in water bodies is not homogenous due to historical and physical constraints. In Europe, fish inhabiting reservoirs and lakes are of riverine origin, and they may choose habitats that are similar to those in rivers, such as tributary inlets and shallow littoral areas (Fernando Holcik 1991). In addition, most reservoirs are strictly thermally stratified, and fish prefer to inhabit epilimnion (Vasek. et al. 2004). Experiments leading to understanding fish spatial distribution are difficult, so observations in simplified 'natural' conditions may unravel important facts. The aim of this study was to describe distributional patterns in three artificial reservoirs with no thermal stratification.