Temperature-dependent differences in foraging ability of two percids, Perca fluviatilis and Gymnocephalus cernuus

1987 ◽  
Vol 19 (1) ◽  
pp. 45-53 ◽  
Author(s):  
Eva Bergman
Keyword(s):  
Perca Fluviatilis ◽  
Temperature Dependent ◽  
Gymnocephalus Cernuus ◽  
Foraging Ability

Nanobacteria associated with mucous intestines of freshwater fishes and tegument of their parasites (Cestoda)

2008 ◽  
Vol 53 (3) ◽  
Author(s):  
Janetta Korneva
Keyword(s):  
Electron Microscopy ◽  
Perca Fluviatilis ◽  
Cestode Species ◽  
Gymnocephalus Cernuus ◽  
Barbatula Barbatula ◽  
Fish Hosts ◽  
Microbial Morphotypes ◽  
Indigenous Microflora ◽  
Scanning Electron ◽  
Triaenophorus Nodulosus

AbstractThe teguments of four cestode species (Triaenophorus nodulosus, Proteocephalus torulosus, P. percae, P. cernuae) and the intestines of their freshwater fish hosts (Esox lucius, Barbatula barbatula, Perca fluviatilis, Gymnocephalus cernuus) inhabited by bacteria have been investigated with scanning electron microscopy. Most of the bacteria have sizes very similar to nanobacteria (that is, 0.25–0.3 μm in diameter). At least 4 microbial morphotypes were identified. These observations indicate that the normal indigenous microflora in cestodes and their fish hosts, associated with the digestive transport surfaces and consist of bacteria and nanobacteria.

Changes in Abundance of Two Percids, Perca fluviatilis and Gymnocephalus cernuus, along a Productivity Gradient: Relations to Feeding Strategies and Competitive Abilities

1991 ◽  
Vol 48 (4) ◽  
pp. 536-545 ◽  
Author(s):  
Eva Bergman
Keyword(s):  
Interspecific Competition ◽  
Perca Fluviatilis ◽  
Diet Breadth ◽  
Feeding Strategies ◽  
Light Penetration ◽  
High Productivity ◽  
Gymnocephalus Cernuus ◽  
Abundance Patterns ◽  
Productivity Gradient ◽  
Perch Perca Fluviatilis

Relative abundances of perch (Perca fluviatilis) and ruffe (Gymnocephalus cernuus) were studied in eight lakes ranked along a gradient of increasing productivity. The diets of perch and ruffe in relation to food resources were quantified over a 5-mo period in one lake of moderate and one lake of high productivity. The abundance of perch decreased and that of ruffe increased along the productivity gradient. Large perch ate fish over the whole season in the more productive lake, but rarely ate fish in May and June in the less productive lake. All size classes of ruffe fed mainly on macrobenthos in both lakes. The diversity of macrobenthos was higher in the lake of low productivity, as was the diet breadth of ruffe. The abundance patterns of perch and ruffe are likely related to the simultaneous effect of increasing prey abundance and decreasing light penetration with increasing productivity. Furthermore, the abundance of perch is likely affected by increasing interspecific competition and that of ruffe by decreasing predation pressure as productivity increases.

scholarly journals A check-list of parasites of percid fishes (Actinopterygii: Percidae) from the estuaries of the Polish coastal zone

2008 ◽  
Vol 45 (4) ◽  
pp. 196-203 ◽  
Author(s):  
J. Morozinska-Gogol
Keyword(s):  
Geographical Distribution ◽  
Coastal Zone ◽  
Perca Fluviatilis ◽  
Check List ◽  
Sander Lucioperca ◽  
European Perch ◽  
Gymnocephalus Cernuus ◽  
Perch Perca Fluviatilis ◽  
Pike Perch

AbstractThe present paper summarized data on parasites of percid fishes (Actinopterygii: Percidae), such as pike-perch, European perch and ruffe from estuaries of the Polish coastal zone are listed, based on published records and long-term surveys carried out by the author. Parasites are listed alphabetically, separately for each host and for each parasite group with notes on their location on the host and geographical distribution (with references). A total of 41 species (taxa) of parasites were recorded on pike-perch Sander lucioperca (6 Ciliophora, 1 Myxozoa, 1 Monogenea, 11 Digenea, 4 Cestoda, 6 Nematoda, 5 Acanthocephala, 1 Mollusca, 1 Hirudinea, 4 Copepoda and 1 Branchiura). European perch, Perca fluviatilis, harboured 60 parasites (6 Ciliophora, 4 Myxozoa, 1 Monogenea, 18 Digenea, 9 Cestoda, 10 Nematoda, 5 Acanthocephala, 1 Mollusca, 1 Hirudinea, 4 Copepoda and 1 Branchiura). Ruffe Gymnocephalus cernuus featured 43 parasites (1 Microsporidia, 7 Ciliophora, 3 Myxozoa, 1 Monogenea, 13 Digenea, 5 Cestoda, 8 Nematoda, 2 Acanthocephala, 1 Mollusca and 2 Copepoda).

Percid occupation of submersed riverine macrophytes: food resource partitioning between perch (Perca fluviatilis L.) and ruffe (Gymnocephalus cernuus L.)

2012 ◽  
Vol 41 (1) ◽  
Author(s):  
Małgorzata Dukowska ◽  
Maria Grzybkowska ◽  
Joanna Lik ◽  
Wojciech Jurasz
Keyword(s):  
Water Discharge ◽  
Food Resource ◽  
Perca Fluviatilis ◽  
Niche Overlap ◽  
Gymnocephalus Cernuus ◽  
Cladoceran Species ◽  
Perch Perca Fluviatilis ◽  
Food Niche ◽  
Research Period ◽  
Food Resource Partitioning

AbstractIn a reservoir tailwater of the large, lowland Warta River, perch and ruffe coexist in a macrophyte habitat, which develops as a result of low water discharge in the late spring and summer. At the beginning of each year the diet of both percids, when shorter than 100 mm, is dominated by large, benthic Hydropsyche. Later in the year, epiphytic Chironomidae and Simuliidae replace these trichopterans in the perch diet, and benthic Chironomidae replace them in the ruffe diet. Large cladoceran species then become accessory food items for perch. Consequently, the food niche overlap of these two percids during the research period is only marginal.

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