scholarly journals Response of the residential piscivorous fish community to introduction of a new predator type in a mesotrophic lake

2006 ◽  
Vol 63 (10) ◽  
pp. 2202-2212 ◽  
Author(s):  
Torsten Schulze ◽  
Ulrich Baade ◽  
Hendrik Dörner ◽  
Reiner Eckmann ◽  
Susanne S Haertel-Borer ◽  
...  
Keyword(s):  
Fish Community ◽  
Perca Fluviatilis ◽  
Northern Pike ◽  
Piscivorous Fish ◽  
Perch Perca Fluviatilis ◽  
Consumption Data ◽  
Introduced Predators ◽  
Annual Consumption ◽  
Before And After ◽  
Consumption Rates

Although the effects of introduced predators on prey populations in aquatic ecosystems have been studied frequently, less is known about the interactions between predators. We performed a whole-lake experiment by stocking a non-native top predator (pikeperch (Sander lucioperca)) to two residential piscivores (Eurasian perch (Perca fluviatilis) and northern pike (Esox lucius)). By analyzing spatial distribution, diet composition, growth, and consumption rates of the piscivores before and after pikeperch introduction, we tested how both density-dependent and trait-mediated responses affected interactions between the three predators. Total piscivore biomass increased 1.5 times and annual consumption by the piscivores increased 1.7 times after stocking, attributable to the stocked pikeperch and increased northern pike abundances. Abundance, distribution, and consumption data indicated that northern pike was hardly affected by pikeperch stocking and even increased its biomass, whereas piscivorous perch shifted its habitat use towards the littoral lake areas in response to competition with pikeperch. Furthermore, all piscivores increasingly fed on small perch. The forced habitat shift of piscivorous perch in combination with increased predation on small perch led to a decreased abundance of large perch, attributable to the compensatory effects of intraguild predation and cannibalism.

Changes in Fish Community of Klíčava Reservoir with Particular Reference to Eurasian Perch (Perca fluviatilis), 1957–72

1977 ◽  
Vol 34 (10) ◽  
pp. 1734-1747 ◽  
Author(s):  
Juraj Holčík
Keyword(s):  
Fish Community ◽  
Fish Fauna ◽  
Perca Fluviatilis ◽  
Northern Pike ◽  
Zooplankton Biomass ◽  
Fish Biomass ◽  
Biomass Density ◽  
Eurasian Perch ◽  
Perch Perca Fluviatilis ◽  
Stizostedion Lucioperca

Soon after the 1955 filling of the 60 ha mesotrophic Klíčava Reservoir in Czechoslovakia, the fish fauna started to change. Generally, lithophils were replaced by phytophils and then by ecologically more plastic species. Fish biomass increased in the first 12 yr from 65 to 236 kg/ha, but after 1967 dropped to about 170 kg/ha. Increased biomass and density of piscivores were responsible for the decline. Among the piscivores the most important role was played by the pikeperch (Stizostedion lucioperca) rather than the Eurasian perch (Perca fluviatilis) or northern pike (Esox lucius). Cyclical changes in the age structure of the perch population and the periodical occurrence of many young resulted from fluctuations in the rate of cannibalism, which affected the density of the fry and yearlings. A decline in zooplankton biomass and disappearance of larger zooplankters in the first 5–6 yr of the reservoir were due to increased density of fish, especially perch, which fed on zooplankton. Synchronous predation by piscivores and zooplanktivores produced a nearly stable zooplankton biomass in the later years of the reservoir. The perch is a highly specialized species which behaves in the fish community more or less autonomously, because it is able to control its own density in accord with its food resources. The above conclusions are based on a literature review and analyses of new data. Key words: Percidae, community ecology, Perca, biomass, density, production, predation

DNA adducts and histopathological lesions in perch (Perca fluviatilis) and northern pike (Esox lucius) along a polycyclic aromatic hydrocarbon gradient on the Swedish coastline of the Baltic Sea

1998 ◽  
Vol 55 (4) ◽  
pp. 815-824 ◽  
Author(s):  
G Ericson ◽  
E Lindesjöö ◽  
L Balk
Keyword(s):  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Dna Adducts ◽  
Perca Fluviatilis ◽  
Head Kidney ◽  
Northern Pike ◽  
Esox Lucius ◽  
Pike Esox Lucius ◽  
Perch Perca Fluviatilis ◽  
Polycyclic Aromatic

DNA adducts, histopathological abnormalities, and organosomatic indices were used to study contaminant effects on fish along a polycyclic aromatic hydrocarbon (PAH) gradient, leading away from an aluminum smelter on the Swedish Baltic coast. The level of DNA adducts, analysed using the 32P-postlabelling method, was at least 145 times higher in the liver of female perch (Perca fluviatilis) from the innermost site on the gradient, closest to the suspected point source of PAHs, than at a distant reference site. Of the DNA adducts analysed, a relatively small number accounted for a very high proportion of the total level of adducts (30-60% at the innermost site and close to 100% at the outermost site). These particular adducts could also be observed in extrahepatic tissues, such as trunk kidney and head kidney, along the entire gradient. Similar patterns of adducts were also observed in northern pike (Esox lucius). Focal hepatocellular degeneration in perch was about 15 times more extensive at the innermost site than at the next site in the gradient and absent in perch from the two outermost sites. Body size relative to age was also significantly reduced in perch from the three innermost sites compared with the outermost site.

Aggregations of Spottail Shiners and Yellow Perch

1969 ◽  
Vol 26 (6) ◽  
pp. 1672-1676 ◽  
Author(s):  
J. R. Nursall ◽  
Morley E. Pinsent
Keyword(s):  
Shallow Water ◽  
Yellow Perch ◽  
Perca Fluviatilis ◽  
Northern Pike ◽  
Total Length ◽  
Perch Perca Fluviatilis ◽  
Fish Predators ◽  
Beaver Lake

Spottail shiners (Notropis hudsonius (Clinton)) and immature yellow perch (Perca fluviatilis Linnaeus), ranging in size from 30 to 110 mm, total length, aggregate in shallow water in Beaver Lake, Alberta. The ratio of number of shiners to that of perch is about 1.5:1. Perch larger than 110 mm leave the aggregation. Eventually they will prey on it from below. Other predators include northern pike and walleye, which lie below the aggregation, and terns and gulls from above. Shiners in the aggregation are 10 times more likely to be taken by fish predators than are perch.

Changes in Fish Mercury Concentrations in an Intensively Fished Lake

1990 ◽  
Vol 47 (10) ◽  
pp. 1888-1897 ◽  
Author(s):  
Matti Verta
Keyword(s):  
Growth Rate ◽  
Perca Fluviatilis ◽  
Anguilla Anguilla ◽  
Rutilus Rutilus ◽  
Northern Pike ◽  
Top Predator ◽  
Roach Rutilus Rutilus ◽  
Perch Perca Fluviatilis ◽  
High Mercury ◽  
Total Fish

A small polyhumic lake inhabited by northern pike (Esox lucius), burbot (Lota lota), perch (Perca fluviatilis), roach (Rutilus rutilus), and eel (Anguilla anguilla) was fished intensively during spring 1984 and 1985 to lower the high mercury levels in the top predator, northern pike. A total catch of 29.5 kg∙ha−1 (74% roach) was removed which represented about 50% of the total fish biomass. Mercury concentrations in burbot, large pike, and small roach had decreased by 1987 and 1988, but increased in young pike and some perch. Northern pike had the clearest increase in growth rate, while that of perch and roach levelled off within 3 yr at the prefishing level. Only a small increase in growth rate of burbot occurred. The yearly accumulation of mercury in northern pike remained constant, and the decrease in [Hg] was apparently due to growth dilution. The decrease in [Hg] of burbot and roach is explained by a switch to a diet with lower [Hg] or a decrease in water methylmercury concentrations. The amount of methylmercury removed from the lake by fishing was equivalent to several years of calculated mercury methylation and accumulation in the fish. Overfishing may be a feasible means of lowering methylmercury levels in this type of oligotrophic lake.

scholarly journals The effect of turbidity and prey fish density on consumption rates of piscivorous Eurasian perch Perca fluviatilis

2014 ◽  
Vol 73 (1) ◽  
Author(s):  
Lene Jacobsen ◽  
Søren Berg ◽  
Henrik Baktoft ◽  
P. Anders Nilsson ◽  
Christian Skov
Keyword(s):  
Perca Fluviatilis ◽  
Fish Density ◽  
Prey Fish ◽  
Eurasian Perch ◽  
Perch Perca Fluviatilis ◽  
Consumption Rates

Trends in Harvests of Pikeperch (Stizostedion lucioperca), Eurasian Perch (Perca fluviatilis), and Northern Pike (Esox lucius) and Associated Environmental Changes in Lakes Mälaren and Hjälmaren, 1914–74

1977 ◽  
Vol 34 (10) ◽  
pp. 1720-1724 ◽  
Author(s):  
Hugo Rundberg
Keyword(s):  
Environmental Changes ◽  
Perca Fluviatilis ◽  
Northern Pike ◽  
Esox Lucius ◽  
Community Change ◽  
Eurasian Perch ◽  
Important Species ◽  
Pike Esox Lucius ◽  
Perch Perca Fluviatilis ◽  
Stizostedion Lucioperca

The fish communities in and the trophic states of lakes Mälaren and Hjälmaren have changed gradually since the late 1700s. In both lakes, pikeperch (Stizostedion lucioperca), Eurasian perch (Perca fluviatilis), and northern pike (Esox lucius) are important species in the recreational and commercial fishery. Pikeperch has increased from an unimportant species to predominance in both lakes. The importance of Eurasian perch however, has decreased markedly. The most likely explanation for these changes is increased cultural eutrophication. Key words: Percidae, pikeperch, Eurasian perch, northern pike, harvests, eutrophication, community change, behavior

Effects of Fisheries on Eurasian Perch (Perca fluviatilis) in Windermere

1977 ◽  
Vol 34 (10) ◽  
pp. 1764-1768 ◽  
Author(s):  
T. B. Bagenal
Keyword(s):  
Growth Rate ◽  
Key Words ◽  
Perca Fluviatilis ◽  
Northern Pike ◽  
Review Of Literature ◽  
Class Model ◽  
Eurasian Perch ◽  
Perch Perca Fluviatilis ◽  
Trap Fishery ◽  
Average Size

A review of literature indicated that a wartime (1941–48) trap fishery reduced the Eurasian perch (Perca fluviatilis) population very considerably. An experimental gillnet fishery for northern pike (Esox lucius) from 1944 to 1975 presumably contributed to keeping the perch population low through increased predation. The gillnet fishery reduced the average size of the pike, and their growth rate increased, in turn increasing the predation on younger perch. This predation controlled recruitment to the adult perch population. Pike predation is given as one factor in a model explaining year-class fluctuations. Key words: Percidae, exploitation, year-class fluctuations, Perca predation, year-class model

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