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

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.

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

scholarly journals Temporally stable, weak genetic structuring in brackish water northern pike (Esox lucius) in the Baltic Sea indicates a contrasting divergence pattern relative to freshwater populations

2017 ◽  
Vol 74 (4) ◽  
pp. 562-571 ◽  
Author(s):  
Lovisa Wennerström ◽  
Jens Olsson ◽  
Nils Ryman ◽  
Linda Laikre
Keyword(s):  
Genetic Structure ◽  
Baltic Sea ◽  
Brackish Water ◽  
Northern Pike ◽  
Esox Lucius ◽  
The Baltic Sea ◽  
Genetic Structuring ◽  
Important Species ◽  
Pike Esox Lucius ◽  
The Baltic

Understanding spatiotemporal population genetic patterns is important for conservation management of ecologically and socioeconomically important species. This is particularly so in species-poor environments such as the brackish Baltic Sea. We examined over 600 northern pike (Esox lucius), a coastal predator and treasured sport fish, collected over major parts of the Baltic Sea coastline. We found low genetic divergence among populations, indicating a contrasting genetic structure of brackish water coastal spawners compared with previous reports on anadromous Baltic pike migrating up freshwater streams for spawning. A pattern of genetic isolation by distance either over shortest waterway or primarily along the mainland coast with islands as stepping stones suggested that gene flow is primarily taking place among neighboring populations, possibly with some migration over open water. Temporal data showed a stable genetic structure over a decade. Within a single sampling year, however, spatial divergence was larger during spawning than feeding season, indicating increased mixing of populations during the feeding season. Management should assure connectivity among brackish spawning grounds and large population sizes at identified core areas.

Tolerance of Juvenile Perch Perca fluviatilis and Amur Sleeper Perccottus glenii to Predation by Pike Esox Lucius

2019 ◽  
Vol 59 (3) ◽  
pp. 382-388
Author(s):  
A. K. Smirnov ◽  
E. S. Smirnova ◽  
Yu. V. Koduhova ◽  
D. P. Karabanov
Keyword(s):  
Perca Fluviatilis ◽  
Esox Lucius ◽  
Amur Sleeper ◽  
Perccottus Glenii ◽  
Pike Esox Lucius ◽  
Perch Perca Fluviatilis
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