Failure of swim bladder inflation of perch,Perca fluviatilis L. found in natural populations

1996 ◽  
Vol 58 (1) ◽  
pp. 15-23 ◽  
Author(s):  
Mathias Egloff
Keyword(s):  
Natural Populations ◽  
Perca Fluviatilis ◽  
Swim Bladder ◽  
Perch Perca Fluviatilis ◽  
Swim Bladder Inflation

scholarly journals THE FORMATION OF MULTIVESICULAR BODIES FROM THE NUCLEAR ENVELOPE

1970 ◽  
Vol 45 (2) ◽  
pp. 205-211 ◽  
Author(s):  
Wincenty Kilarski ◽  
Andrzej Jasiński
Keyword(s):  
Electron Microscope ◽  
Nuclear Envelope ◽  
Perca Fluviatilis ◽  
Multivesicular Bodies ◽  
Swim Bladder ◽  
Perch Perca Fluviatilis ◽  
Mechanisms Of Formation ◽  
Gas Gland ◽  
Intense Activity ◽  
Active Proliferation

Cells of the gas gland of the perch Perca fluviatilis L., stimulated to increased generation of gas by the repeated emptying of the swim-bladder, were examined in the electron microscope. Intense activity of the nuclear envelope was demonstrated. Simple vesicles originating from the external nuclear membrane and the so-called multivesicular bodies derived from the outpocketings of both membranes of the nuclear envelope were observed. The multivesicular bodies were filled with numerous fine vesiculae arising from the active proliferation of their internal membrane. The authors offer two alternative mechanisms of formation of fine vesiculae inside the multivesicular bodies and the mechanism of the tearing away of these bodies from the nuclear envelope.

Genetic and morphological variability in cestodes of the genus Proteocephalus: geographical variation in Proteocephalus percae populations

1999 ◽  
Vol 77 (9) ◽  
pp. 1450-1458 ◽  
Author(s):  
Vladimíra Hanzelová ◽  
Viliam Šnábel ◽  
Ivica Král'ová ◽  
Tomáš Scholz ◽  
Stefano D'Amelio
Keyword(s):  
Random Amplified Polymorphic Dna ◽  
Morphological Variability ◽  
Population Sample ◽  
Natural Populations ◽  
Water Reservoir ◽  
Perca Fluviatilis ◽  
Morphological Characters ◽  
Rapd Profile ◽  
Perch Perca Fluviatilis ◽  
Apical Sucker

Genetic and morphological variability was studied in the tapeworm Proteocephalus percae (Müller, 1780) (Cestoda: Proteocephalidae), a parasite of perch (Perca fluviatilis L.). Geographic variation in isoenzyme patterns, random amplified polymorphic DNA (RAPD) profiles, and morphological characters were found within six natural populations of P. percae from Slovakia and Switzerland. All approaches used showed that similarity was substantially higher among Swiss populations than among Slovak populations. Proteocephalus percae specimens from the Dobšiná water reservoir (Slovakia) differed significantly from all other population sample sets in that they exclusively expressed the genotype Acp92/Acp92 and possessed a specific RAPD profile after amplification with the primer p78 and distinct measurements of the scolex (scolex width and apical sucker). The unique position of the P. percae population from Dobšiná could be related to the contamination of this locality with heavy metals (cadmium), through the possible impact of these metals on the alterations observed. The taxonomic relevance and stability of the morphological characters related to the scolex in the Proteocephalus tapeworm group is confirmed.

Consumption of plant material by perch (Perca fluviatilis)

2016 ◽  
Vol 65 (2) ◽  
pp. 95-97 ◽  
Author(s):  
Tomáš Zapletal ◽  
Zdeněk Adámek ◽  
Pavel Jurajda ◽  
Kevin Roche ◽  
Lucie Všetičková ◽  
...  
Keyword(s):  
Plant Material ◽  
Perca Fluviatilis ◽  
Perch Perca Fluviatilis

Short-term storage of perch (Perca fluviatilis L.) milt under cooling conditions

2013 ◽  
Vol 13 ◽  
pp. 39 ◽  
Author(s):  
Beata Sarosiek ◽  
Beata I. Cejko ◽  
Dariusz Kucharczyk ◽  
Daniel Żarski ◽  
Sylwia Judycka ◽  
...  
Keyword(s):  
Perca Fluviatilis ◽  
Short Term ◽  
Cooling Conditions ◽  
Perch Perca Fluviatilis ◽  
Short Term Storage ◽  
Term Storage
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