scholarly journals Régime et comportement alimentaire du gardon (Rutilus rutilus (L.)) et de la perche (Perca fluviatilis L.) de la retenue de Pareloup. - l. Les alevins.

1994 ◽  
Vol 6 ◽  
pp. 227-242 ◽  
Author(s):  
C. Dubois ◽  
C. Richeux ◽  
J. N. Tourenq ◽  
Lejolivet
Keyword(s):  
Perca Fluviatilis ◽  
Rutilus Rutilus ◽  
Comportement Alimentaire

Relative Importance of Phosphorus Supply to Phytoplankton Production: Fish Excretion versus External Loading

1990 ◽  
Vol 47 (2) ◽  
pp. 364-372 ◽  
Author(s):  
Åge Brabrand ◽  
Bjørn Andreas Faafeng ◽  
Jens Petter Moritz Nilssen
Keyword(s):  
Algal Growth ◽  
Perca Fluviatilis ◽  
Rutilus Rutilus ◽  
Phosphorus Release ◽  
Selenastrum Capricornutum ◽  
Phosphorus Loading ◽  
External Loading ◽  
Phytoplankton Production ◽  
Roach Rutilus Rutilus ◽  
Order Of Magnitude

In laboratory tanks with bream (Abramis brama), perch (Perca fluviatilis), and roach (Rutilus rutilus) concentrations of phosphorus and nitrogen increased with time. Phosphorus was mainly released as soluble molybdate-reactive phosphorus (SRP); nitrogen almost exclusively as ammonium. The release increased with the species' tendency to forage on littoral sediments and with a smaller fish size. Bioassays with the test algae Selenastrum capricornutum showed that released phosphorus was readily available to algal growth. The total supply of phosphorus to the epilimnion of Lake Gjersjøen was calculated from the external supply from the tributaries and the estimated phosphorus release from total roach biomass. From May to October 1980 phosphorus release from the roach population contributed about the same order of magnitude as the total phosphorus loading from the watershed. During the period with the most serious phosphorus depletion to the phytoplankton (July, August, and September), the phosphorus supply from fish was about double that of the external phosphorus supply, confirming the important role of sediment-feeding fish populations in the eutrophication processes of lakes.

Piscivorous fishes diet dominated by the Asian cyprinid invader, topmouth gudgeon (Pseudorasbora parva)

Biologia ◽  
2007 ◽  
Vol 62 (4) ◽  
Author(s):  
Jiří Musil ◽  
Zdeněk Adámek
Keyword(s):  
Czech Republic ◽  
Prey Species ◽  
Ecological Integrity ◽  
Perca Fluviatilis ◽  
Rutilus Rutilus ◽  
Cyprinid Fish ◽  
Pseudorasbora Parva ◽  
Sander Lucioperca ◽  
Topmouth Gudgeon ◽  
Native Fishes

AbstractPredation on the non-native cyprinid, Pseudorasbora parva, was reported during an annual study in a small connecting canal about 40 km south of Brno, Czech Republic. Two cyprinid fish species (Pseudorasbora parva, Rutilus rutilus) were identified in the diet of 23 piscivores belonging to three native fishes (Perca fluviatilis, Sander lucioperca, Esox lucius). The relative abundance of prey fishes changed seasonally and was dominated by the topmouth gudgeon in spring. Thereafter roach incidence continuously increased. In contrast, topmouth gudgeon was found to be a more sized-available prey and was the most dominant prey species in the diet of all piscivorous fishes during the whole season. Strong piscivory towards this alien might be beneficial for its eradication or control to support ecological integrity in natural and modified seminatural habitats.

The distribution and host range of species of the blood fluke Sanguinicola in British freshwater fish

1994 ◽  
Vol 68 (4) ◽  
pp. 315-318 ◽  
Author(s):  
R.S. Kirk ◽  
J.W. Lewis
Keyword(s):  
Host Range ◽  
Freshwater Fish ◽  
Perca Fluviatilis ◽  
Rutilus Rutilus ◽  
First Record ◽  
Tinca Tinca ◽  
Blood Flukes ◽  
Southern Central ◽  
Fish Hosts

AbstractThe distribution and host range of Sanguinicola armata, S. inermis and S. volgensis in British freshwater fish are described. S. inermis has been recorded in carp Cyprinus carpio, crucian carp Carassius carassius and tench Tinca tinca in southern, central and eastern England and in koi carp imported from Japan. S. armata has been detected in pike Esox lucius and tench and S. volgensis has been found in chub Leuciscus cephalus, dace Leuciscus leuciscus, perch Perca fluviatilis, roach Rutilus rutilus and pike in southern and eastern England. The first record of the co-occurrence of two species of Sanguinicola (S. inermis and S. volgensis) in a British inland water is reported. The importance of blood flukes and the role of anthropochore movement of fish hosts in dissemination of S. inermis are discussed.

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