The food of roach, Rutilus rutilus (Actinopterygii: Cypriniformes: Cyprinidae), in a biomanipulated water supply reservoir

Diet seasonality and food overlap of Perca fluviatilis (Actinopterygii: Perciformes: Percidae) and Rutilus rutilus (Actinopterygii: Cypriniformes: Cyprinidae) juveniles: A case study on Bovan Reservoir, Serbia

“…This is also indicated by Okun and Mehner (2005). Zapletal et al (2014) reported that roach consumed far fewer copepods, while Kornijów et al (2005) noted that copepods were not part of roach diet. Copepods rarely occur in planktivorous fish diets, such as roach, because of their ability to escape from predators (Peterka and Matěna 2009;Karus et al 2014).…”

“…It was possible to detect its presence in the diet but not to quantify it, except with frequency of occurrence, the values of which were high. The importance of detritus in the roach diet has been noted by Kornijów et al (2005) and Zapletal et al (2014). According to Matěna (1995Matěna ( , 1998, the roach diet changes according to the ontogenetic stage, with the proportion of macrophytes and detritus increasing as the fish gets older.…”

Cyanobacterial Abundance and Microcystin Profiles in Two Southern British Lakes: The Importance of Abiotic and Biotic Interactions

“…making up a substantial component of adult fish’s food supply. Larval stages and young age classes of R. rutilus and S. erythrophthalmus, numerous during summer months are almost exclusively zooplanktoniverous, with a feeding preference for rotifers [ 44 ]. Rotifers and other small zooplankton, such as cyclopoid copepods and cladocerans, are selective grazers that can coexist with bloom forming cyanobacteria and are reported to periodically exhibit top-down control [ 45 ].…”

“…represent a less attractive foodstuff for zooplankton due inter alia to colony formation [ 45 , 46 , 47 ], which together with a reduction in grazing pressure on other cyanobacterial taxa may have created a competitive advantage for the non-toxic Microcystis -like cell populations, such as unknown species of picoplankton in lake 1. R. rutilus abundance has previously been implicated in ichthyo-eutrophication of reservoirs in the Czech Republic [ 44 ]; this has been attributed to a range of factors but may also include reduction in grazing rates by zooplankton, which in turn create advantageous conditions for blooms [ 48 ]. Furthermore, eutrophication can change microbial loops and therefore may inhibit antagonistic microorganisms (viruses, bacteria, microalgae, microfungal, and amoeboid taxa) present within Microcystis colonies in the operation of bottom-up controls [ 45 ].…”

Summer co‐existence of small‐sized cyprinid and percid individuals in natural and impounded stretches of a lowland river: food niche partitioning among fishes

“…when chironomid pupae move to the water surface before emerging, R. rutilus immediately consume huge numbers of them (Makino et al ., ). Thus R. rutilus may consume a broad spectrum of food types in different water bodies, showing a high dietary flexibility with regard to macroinvertebrates and low in relation to total fish density.Thus this species may be classified as a typically omnivorous feeder and generalist, which facilitates their rapid growth and invasion success in novel habitats (Persson, ; Kornijów et al ., ; Horppila & Nurminen, ; Boros et al ., ; Hayden et al ., ; Zapletal et al ., ). Regardless of the quantity and quality of the available food in both stretches of the River Warta, the niche breadths of R. rutilus were similar.…”