Occurrence and life cycles of Dermocystidium species (Mesomycetozoa) in the perch (Perca fluviatilis) and ruff (Gymnocephalus cernuus) (Pisces: Perciformes) in Finland and Estonia

2003 ◽  
Vol 37 (10) ◽  
pp. 1155-1172 ◽  
Author(s):  
MARKETTA PEKKARINEN ◽  
KAJA LOTMAN
Keyword(s):  
Perca Fluviatilis ◽  
Life Cycles ◽  
Gymnocephalus Cernuus ◽  
Perch Perca Fluviatilis

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.

scholarly journals INVASION OF FISH BY LARVAE OF THE FAMILY DIPHYLLOBOTHRIIDAE IN THE KHANTY-MANSI AUTONOMOUS OKRUG – YUGRA

2021 ◽  
pp. 367-373
Author(s):  
Moskina ◽  
Shafranova ◽  
Kozlova ◽  
Guzeeva
Keyword(s):  
Perca Fluviatilis ◽  
Gymnocephalus Cernuus ◽  
Ob River ◽  
Muscle Tissues ◽  
Perch Perca Fluviatilis ◽  
Study Results ◽  
The Family ◽  
Irtysh Basin ◽  
High Level ◽  
Khanty Mansi Autonomous

Two epidemiologically significant species of the tapeworm (D. latum и D. dendriticum) circulate in of the Ob-Irtysh basin within the Khanty-Mansi Autonomous Okrug. They have an unequal effect on the human body. The purpose of the science work is to determine the invasion of fish by larvae of tapeworms D.latum and D.dendriticum (Perch Perca fluviatilis, Ruff Gymnocephalus cernuus, Pike Esox lucius, Syrok Coregonus peled, Muksun Coregonus muksun, Nelma Stenodus leucichthys nelma) from waterbodies of the Ob River and its tributaries from 2013 to 2019 year. The study aim is to identify the main factors of transmission of the invasion (diphyllobothriasis) to population. The fish for parasitological research and species identification was caught in the Ob River and its tributary, the Vakh River, as well as Torm-Emtor Lake. The studies were carried out in the parasitological laboratory of the Center for Hygiene and Epidemiology in the Khanty-Mansi Autonomous Okrug – Yugra, Nizhnevartovsk, the Nizhnevartovsk District, in Megione and Raduzhny by the method of incomplete helminthological study of fish. The study results found in general a very high level of plerocercoid invasion of fish from the Ob and Vakh Rivers. It was noted that the pike had a significantly high percentage of infection with D. latum, 71.64%. The highest intensity of invasion and localization of larvae (the family Diphyllobothriidae) was on the abdominal wall of the fish, and then on walls and in the thickness of walls of esophagus and stomach, in eggs, and very few in muscle tissues.

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