Abstract
This article represents a comparative study
on the fish fauna from the Bistricioara River
before the anthropic impact that took place after
1960 and the present fauna. The evaluation of the
present status of the fish communities was
performed in 4 collecting points on the main
course of the river, by highlighting the abundance
and absolute biomass, the numeric stock and
gravimetrical stock at each collecting point.
The ecological rang of every species in the
structure of fish communities and the present
zoning fish of the river were determined by
calculating the ecological indices (constancy,
dominance, ecological significance). The
biodiversity index and the biological integrity
index (IBI), which are the best indicators of the
degree to which the fish fauna is affected by the
anthropic impact, were also calculated.