Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"Perca fluviatilis"”.
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A Comparative Analysis of Perca fluviatilis Population Dynamics From Two Lakes in New Zealand
… examined the population dynamics of European Perca fluviatilis populations from Warkworth Quarry Lake and Lake Rototoa. A total of 206 fish samples from Warkworth Quarry Lake and 99 fish samples from Lake Rototoa were histologically analyzed and sagittal otoliths examined to obtain estimates …
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Verteilung und Ernährung larvaler und juveniler Stadien von Plötze (Rutilus rutilus (L.)) und Barsch (Perca fluviatilis L.) im Biomanipulationsexperiment Feldberger Haussee (Mecklenburg-Vorpommern)
… von Plötze (Rutilus rutilus (L.)) und Barsch (Perca fluviatilis L.) untersucht. Untersuchungsgewässer war der Feldberger Haussee, ein geschichteter eutropher Hardwassersee, der seit über 15 Jahren biomanipuliert wurde. Der Bestand an Barschen war in diesem Gewässer im gesamten …
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A comparison of growth rates of coarse fish in gravel-pit lakes in south-east England and of population structure in selected lakes
… brama L.), tench (Tinca tinca L.), perch (Perca fluviatilis L.) and pike (Esox lucius L.). There was no apparent correlation between fish growth rate and age, size or any other measured parameter of a lake. Two lakes dominated by pike and perch and four lakes dominated by roach, bream and …
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Studies on the life-cycle of the digenetic trematode Rhipidocotyle campanula (Dujardin, 1845) (Gasterostomata : bucephalidae) with particular reference to the larval stages
… the posterior intestine and rectum of the perch (Perca fluviatilis) six weeks after feeding fully developed metacercariae. Spermatogenesis and oogenesis were studied in the adults until egg formation. Miracidial development could not be observed. External morphology using SEM of cercaria, …
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Does fish health matter? The Utility of Biomarkers in Fish for Environmental Assessment
… from a 20-year data set on feral perch (Perca fluviatilis) from national reference areas on the Swedish Baltic coast were exam-ined. During this period, an increasing trend in detoxification enzyme activity (ethoxyre-sorufin-O-deethylase, EROD) in the liver and a reduction in gonad size …
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DETERMINATION OF CONTAMINANTS IN FISHERY PRODUCTS TO SUPPORT FOOD SAFETY
… labrax), seabream (Sparus aurata), perch (Perca fluviatilis), Mediterranean shad (Alosa agone), and European whitefish (Coregonus lavaretus). Through LC-HRMS analysis, the study reveals the presence of PFBA and PFOS in both lake and sea fish, with PFBS exclusively found in lake fish. The …
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Investigating drivers of cyanobacterial blooms in Aotearoa – New Zealand lakes using sedimentary ancient DNA
… non-native fish population, the European perch (Perca fluviatilis). This thesis examined the relationship between cyanobacterial blooms and perch introduction in New Zealand lakes, including a multi-trophic study in Lake Pounui. Perch were introduced c. 1870 in New Zealand but introduction …
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Kōura (Paranephrops planifrons) populations in the Te Arawa lakes: An ecological assessment using the traditional Māori tau kōura harvesting method and recommendations for sustainable management
… spp.), catfish (Ameiurus nebulosus), and perch (Perca fluviatilis), that are efficient predators of kōura, are of the utmost importance in ensuring the sustainability of kōura populations in the Te Arawa lakes.
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Dominanzverhältnisse, Interaktionen und räumliche Verteilung von Barsch, Plötze und Seeforelle in der mesotrophen Talsperre Saidenbach
Im Rahmen der vorliegenden Arbeit wurden die in der mesotrophen Talsperre Saidenbach bedeutendsten Fischarten (Plötze, Barsch, Seeforelle) bezüglich ihrer Populationsstruktur, der Nahrung und der Habitatnutzung untersucht. Ziel war einerseits, die Analyse der Ausgangssituation und der …