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

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.

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

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

Factors Affecting the Shift in Predominance from Eurasian Perch (Perca fluviatilis) to Roach (Rutilus rutilus) in the Kličava Reservoir, Czechoslovakia

1977 ◽  
Vol 34 (10) ◽  
pp. 1571-1575 ◽  
Author(s):  
K. Pivnička ◽  
M. Švátora
Keyword(s):  
Growth Rate ◽  
Sex Ratio ◽  
Environmental Conditions ◽  
Perca Fluviatilis ◽  
Rutilus Rutilus ◽  
Roach Rutilus Rutilus ◽  
Eurasian Perch ◽  
Factors Affecting ◽  
Perch Perca Fluviatilis ◽  
Marked Decline

A shift in predominance from Eurasian perch (Perca fluviatilis) to roach (Rutilus rutilus) in the Kličava Reservoir in 1964, 10 yr after filling, was attributed mainly to a marked decline in the ratio of female to male perch spawners. The ratio was about 1:4 for perch and unity for roach. Fecundity of perch was about 25% that of roach which, together with the decline in spawning females, probably contributed to smaller year-classes. The decline in growth rate of perch in response to increasing abundance was greater than that for roach. Under equal environmental conditions, roach is also more productive than perch. Key words: Percidae, Perca, Rutilus, Kličava Reservoir, Czechoslovakia, shift in predominance, fecundity, sex ratio, methodology, growth–abundance relationships

Perch (Perca fluviatilis) and Pike (Esox lucius) in Windermere from 1940 to 1985; Studies in Population Dynamics

1987 ◽  
Vol 44 (S2) ◽  
pp. s216-s228 ◽  
Author(s):  
E. D. Le Cren
Keyword(s):  
Growth Rate ◽  
Perca Fluviatilis ◽  
Esox Lucius ◽  
Adult Mortality ◽  
Controlling Factors ◽  
The Other ◽  
Pike Esox Lucius ◽  
Perch Perca Fluviatilis ◽  
Main Controlling Factors ◽  
Trap Fishery

The aduit population of perch (Perca fluviatilis) in Windermere was severely reduced by an experimental trap fishery from 1941 to 1947 in one basin and from 1941 to 1964 in the other and has been monitored since. A gillnet fishery for pike (Esox lucius) >550 mm began in 1944 and has continued since. Changes in numbers, recruitment, mortality, growth, biomass, and fecundity have been measured. Summer water temperature and population density affected perch growth; temperature affected pike growth from 1944 to 1959, but not thereafter. A model involving correlations with temperature and negative correlations with abundance of adult perch and 0 group pike explained 90% of variation in perch recruitment for part of the period. Pike recruitment was correlated with temperature. In perch adult mortality rate and growth rate are correlated. Perch numbers are recovering after a 98% adult mortality from disease in 1976. Temperature and size-related predation within and between the two species appear to be the main controlling factors, but the relationships have changed from one part of the period to another.

Oocyte quality indicators in Eurasian perch, Perca fluviatilis L., during reproduction under controlled conditions

Aquaculture ◽  
2011 ◽  
Vol 313 (1-4) ◽  
pp. 84-91 ◽  
Author(s):  
Daniel Żarski ◽  
Katarzyna Palińska ◽  
Katarzyna Targońska ◽  
Zoltán Bokor ◽  
László Kotrik ◽  
...  
Keyword(s):  
Quality Indicators ◽  
Perca Fluviatilis ◽  
Oocyte Quality ◽  
Eurasian Perch ◽  
Controlled Conditions ◽  
Perch Perca Fluviatilis

Effect of different activating solutions on the fertilization ability of Eurasian perch, Perca fluviatilis  L., eggs

2012 ◽  
Vol 28 (6) ◽  
pp. 967-972 ◽  
Author(s):  
D. Żarski ◽  
Á. Horváth ◽  
L. Kotrik ◽  
K. Targońska ◽  
K. Palińska ◽  
...  
Keyword(s):  
Perca Fluviatilis ◽  
Eurasian Perch ◽  
Perch Perca Fluviatilis
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