Seasonal variation of fish abundance and biomass in gillnet catches of an East Mediterranean lake: Lake Doirani

摘要

The seasonal variation offish species composition and abundance in gillnet catches (14-90 mm knet-tc-knot) from tiie Greek part olthe transboundary Lake Doirani was studied during the period 2006-2007. Atotal of 8,41]9 specimens weighting 182.3 kg and belonging to 9 species were caught. Catch composition differed with season. Thus, Rhodeus meridionalis dominated in terms of NPUE the spring, Percafluviatilis the summer and Alburnusmacedonicus the autumn and'winter catches. Cyprinids were generally the most abundant, with the cyprinids:percids biomass ratio rangingfrom Uinsummerto 14.8in winter, supporting the eutropht character of the lake. Richness and Shannon-Wiener diversity and evenness indices differed seasonally(ANOVA;p< 0.05). The abundance-biomass comparative (ABC) curves showed that fish communities were dominated by one or a few opportunistic species (e.g. Rhodeus meridionalis, Albumus macedonicus), which while dominated in number did not dominate in biomass, being small bodied.