Food and nutritive value of gut contents of rudd (Scardinius erythrophthalmus) from Vrana Lake, Cres Island, Croatia
2003
Tomec, M. | Teskeredzic, Z. | Teskeredzic, E. (Ruder Boskovic Inst., Zagreb (Croatia). Center for Marine and Environmental Research)
Gut contents of rudd, Scardinius erythrophthalmus (age group 3+), which represents a dominant fish species in the oligotrophic karstic Vrana Lake, Cres Island, Croatia, were examined. Benthic micro- and macroalgae (Cyanobacteria, Dinophyceae, Bacillariophyceae, Chlorophyceae, Xanthophyceae) constituted the major food items of the species. Macrophytes (mostly Potamogeton), zooplankton (Cladocera and Copepoda) and detritus were also recorded. Over the period of study, diatomaceous Bacillariophyceae were observed in all samples, contributing up to 79 % of dietary intake during February. An increased variation of food in gut contents, associated with elevated gut lipid and protein presence, was observed in May and June. During this period, total energy or nutritive values were increased when compared with other months.
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