نتایج جستجو برای: whitefish
تعداد نتایج: 592 فیلتر نتایج به سال:
The ecosystem of Lake Constance in central Europe has undergone profound modifications over the last six decades. Seasonal and inter-annual changes in the vertical distribution patterns of whitefish were examined and related to changes in biotic and abiotic gradients. Between 1958 and 2007, the average fishing depth in late summer and autumn was related to two factors influencing food supply of...
Next-generation sequencing allows the discovery of large numbers of single nucleotide polymorphisms (SNPs) in species where little genomic information was previously available. Here, we assembled, de novo, over 130 mb of non-normalized cDNA using 454 pyrosequencing data from dwarf and normal lake whitefish and backcross hybrids. Our main goals were to gather a large data set of SNP markers, doc...
In larval and juvenile whitefish (Coregonus /avaretlls L.) from Lake Constance, Germany, the otolith increments are deposited daily, whereas daily deposition could not be confirmed in larval whitefish from Lake Pyhaselka, Finland. The calcium concentration in Lake Constance is high (around 1.3 mM), while calcium deficiency is typical for Finnish lakes (around 0.15 mM). Therefore, the hypothesis...
We assayed microsatellite DNA variation among 1013 broad whitefish, Coregonus nasus, from 36 localities within the lower Mackenzie River (Northwest Territories, Canada) to provide the first assessment of fine-scale population structuring of broad whitefish in this large system. Among sampling locations, averaged across all loci, the number of alleles ranged from 3.00 to 6.71 and heterozygosity ...
In the paper, restriction-fragment length polymorphisms in mitochondrial DNA (mtDNA) were studied to test the hypothesis that sympatric populations of lake whitefish in the Allegash basin have recently diverged through sympatric speciation. Thirteen restriction enzymes were used to analyze mtDNA of 156 specimens representing 13 populations from eastern Canada and northern Maine where normal and...
The contemporary distribution of genetic variation within and among high latitude populations cannot be fully understood without taking into consideration how species responded to the impacts of Pleistocene glaciations. Broad whitefish, Coregonus nasus, a species endemic to northwest North America and the Arctic coast of Russia, was undoubtedly impacted by such events because its geographic dis...
The bony fish of the Caspian Sea are among the most important and most valuable fish in this sea, which unfortunately their reserves have been declining for many reasons in recent years. In this research, environmental factors were investigated on catching important bones such as white rutilus kutum (Kamensky, 1901), golden multitude of Chelon auratus (Risso, 1810) and Alosa saposchnikowii (Gri...
2 List of Figures 5 List of Tables 6 Introduction 7 Study Area 9 Methods 9 Study sites 9 Sampling 13 Feeding condition and spawning readiness 14 Otolith preparation and fish aging 15 Species richness 15 Catch-per-unit-effort 16 Water level monitoring 16 Statistics 17 Results 18 Capture data 18 Species richness 19 Catch-per-unit-effort 22 Water level monitoring 22 Species accounts 26 Northern pi...
The Coregonus lavaretus (Linnaeus, 1758) complex is a morphologically and genetically diverse group of whitefish. Its taxonomic structure has been controversial for almost century. At least 25 forms C. have described in Siberia, but there still no consensus on their intraspecific taxonomy. pidschian (Gmelin, 1789) was as subspecies lavaretus. Recently, it assumed that this also complex. purpose...
A family cluster of three cases of type E botulism were identified in south-east France in September 2009. The suspected food source of infection was a vacuum packed hot-smoked whitefish of Canadian origin purchased by the family during a visit to Finland and consumed several weeks later in France on the day prior to symptom onset. No leftover fish was available to confirm this hypothesis. Vacu...
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