scholarly journals Chemometric analysis of fatty acids profile of bream (Abramis brama), ruffe (Gymnocephalus cernua) and perch (Perca fluviatilis) meat from Lake Gopło and Włocławski Dam Reservoir

2011 ◽  
Vol 12 (4) ◽  
pp. 601-614 ◽  
Author(s):  
Bogumila Kupcewicz ◽  
Magdalena STANEK ◽  
Bogdan JANICKI
Keyword(s):  
Fatty Acids ◽  
Perca Fluviatilis ◽  
Chemometric Analysis ◽  
Abramis Brama ◽  
Dam Reservoir ◽  
Fatty Acids Profile ◽  
Bream Abramis Brama ◽  
Perch Perca Fluviatilis

Effects of Exploitation, Introductions, and Eutrophication on Percids in Lake Balaton

1977 ◽  
Vol 34 (10) ◽  
pp. 1678-1683 ◽  
Author(s):  
Péter Biró
Keyword(s):  
Perca Fluviatilis ◽  
Anguilla Anguilla ◽  
Nonnative Species ◽  
Lake Balaton ◽  
Abramis Brama ◽  
Bream Abramis Brama ◽  
Perch Perca Fluviatilis ◽  
Exploitation Rate ◽  
Maximum Sustained Yield ◽  
Stizostedion Lucioperca

Percid populations in Lake Balaton have undergone changes which are considered to have been caused by individual or combined effects of overfishing, interspecific competition from nonnative species, and loadings of nutrients and pesticides. Eurasian perch (Perca fluviatilis) has almost disappeared and the ruffe (Gymnocephalus cernua) population is declining, probably as a result of competition from the eel (Anguilla anguilla) and effects of cultural eutrophication. Growth rate of pikeperch (Stizostedion lucioperca) is declining while that of the bream (Abramis brama) is increasing. Production of cyprinids has increased up to 10% in recent years, apparently in response to accelerated eutrophication. The exploitation rate of pikeperch is far in excess of that considered necessary for maximum sustained yield. The environment in the most eutrophic part of the lake is now considered to be unfavourable for pikeperch. Key words: Percidae, Stizostedion, Perca, Gymnocephalus, exploitation, eutrophication, introductions, ruffe, Lake Balaton

Influence of Water Clarity on the Catchability of Six Freshwater Fish Species in Bottom Trawls

1992 ◽  
Vol 49 (5) ◽  
pp. 885-893 ◽  
Author(s):  
Anthone D. Buijse ◽  
Leendert A. Schaap ◽  
Tammo P. Bust
Keyword(s):  
Light Intensity ◽  
Fish Species ◽  
Perca Fluviatilis ◽  
Rutilus Rutilus ◽  
Water Clarity ◽  
Roach Rutilus Rutilus ◽  
Bream Abramis Brama ◽  
Perch Perca Fluviatilis ◽  
Class Strength ◽  
Influence Of Water

Bottom trawl surveys are carried out every autumn to estimate the relative abundance of six major fish species, especially that of pikeperch (Stizostedion lucioperca) and Eurasian perch (Perca fluviatilis), in the 182 000-ha Lake IJssel, The Netherlands. The catchability of these species is influenced by light intensity at the bottom and therefore by water clarity and water depth. In autumn, water clarity can differ greatly from day to day because of wind-mediated resuspension of sediments. Catchability of ruffe (Gymnocephalus cernua) and age 0 pikeperch showed a significant inverse relationship with light intensity at the bottom, and therefore, a correction should be made when catch data for these species are used to estimate population size or year-class strength. Results were not consistent for perch, while for smelt (Osmerus eperlanus), roach (Rutilus rutilus), and bream (Abramis brama) the influence of light intensity on catchability was not significant. Corrected and uncorrected estimates of the abundance of age 0 pikeperch, based on trawl samples, were compared to demonstrate the effect of water clarity on the estimation of year-class strength. Increased water clarity can lead to zero catches and consequently diminish the effectiveness of sampling programmes.

scholarly journals Ichthyofauna of some reservoirs of local significance in Aksu district, Pavlodar region

2021 ◽  
Vol 2 ◽  
pp. 28-52
Author(s):  
Zh. Kabdolov ◽  
◽  
K. Tursunkhanov ◽  
A. Kasymkhanov ◽  
I. Pritykin ◽  
...  
Keyword(s):  
Silver Carp ◽  
Perca Fluviatilis ◽  
Rutilus Rutilus ◽  
Roach Rutilus Rutilus ◽  
Bream Abramis Brama ◽  
Perch Perca Fluviatilis ◽  
The Republic ◽  
Tench Tinca Tinca ◽  
Golden Carp ◽  
Local Significance

In 2020, research works were carried out on seven reservoirs of local significance in Aksu district, Pavlodar region. These are Lake Komendant, Lake Krasnoe, Lake Lesnoe, Lake Topalevoe, Lake Kara Murza, Lake Baltazhar and the Karasu Channel. In these reservoirs, the ichthyological composition was studied, such fish species as pike (Esox lucius L., 1758), silver carp (C. gibelio (Bloch, 1782)), golden carp (Carassius carassius (L., 1758)), rotan (Perccottus glenii Dybowski), tench (Tinca tinca (L., 1758)), perch (Perca fluviatilis L. ,1758), roach (Rutilus rutilus (L., 1758)), carp (Cyprinus carpio L.,1758), and bream (Abramis brama (L., 1758)). The species of fish included in the Red Book of the Republic of Kazakhstan, as well as rare or endangered, are not marked in the research catches of the studied reservoirs.

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