The consumption of phantom midge Chaoborus flavicans larvae by Perca fluviatilis showed clear response to water colour, predation threat and shoal composition with the most significant negative effect for water colour. In the case of Rutilus rutilus , no similar combined response was observed and the total prey consumption was significantly negatively affected by predation threat of Esox lucius . The results suggest that diffe...

Abundance, sex ratio and size structure of perch, Perca fluviatilis L., populations were studied in two forest lakes. The influence of maternal size on the amount and quality of eggs and larvae was investigated, and the effect of the spawning stock’s length structure on population egg and fry production was evaluated. The importance of large females was essential for the reproduction of perch. Large perch spawned more and bigg...

The field data from four humic lakes suggested that water colour may have both direct and indirect effects on inter‐ and intra‐specific interactions of perch Perca fluviatilis and roach Rutilus rutilus . The results agree with suggestions that, compared with R. rutilus , P. fluviatilis may be an inferior forager on zooplankton in highly coloured water. As an indirect effect, water colour decreases the coverage of macrophytes a...