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.

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.

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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