The list of alien species in the ichthyofauna of the Czech Republic

Lusk, Stanislav; Lusková, V.; Hanel, Lubomír

doi:10.1134/s2075111710030057

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…For example, the most recent Red List of threatened species in the Czech Republic now lists C . carassius in the Critically Endangered category (CR, A2ace; [ 15 ]). Because some local populations have experienced recent extinctions, e.g.…”

Section: Introductionmentioning

confidence: 99%

Morphologically indistinguishable hybrid Carassius female with 156 chromosomes: A threat for the threatened crucian carp, C. carassius, L

et al. 2018

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The crucian carp Carassius carassius (Linnaeus, 1758), is native to many European freshwaters. Despite its wide distribution, the crucian carp is declining in both the number and sizes of populations across much of its range. Here we studied 30 individuals of a putative pure population from Helsinki, Finland. Despite clear external morphological features of C. carassius, an individual was of a higher ploidy level than the others. We therefore applied a set of molecular genetic (S7 nuclear and cytochrome b mitochondrial genes) and cytogenetic tools (sequential fluorescent 4’, 6-diamidino-2-phenylindole [DAPI], Chromomycin A3 [CMA3], C-banding and in situ hybridization [FISH] with both 5S and 28S ribosomal DNA probes) to determine its origin. While all examined characteristics of a diploid representative male (CCAHe2Fi) clearly corresponded to those of C. carassius, a triploid individual (CCAHe1Fi) was more complex. Phylogenetic analysis revealed that the nuclear genome of CCAHe1Fi contained three haploid sets: two C. gibelio and one C. carassius. However the mitochondrial DNA was that of C. gibelio, demonstrating its hybrid origin. The FISH revealed three strong (more intensive) 5S rDNA loci, confirming the triploid status, and an additional 24 weak (less intensive) signals were observed in the chromosome complement of CCAHe1Fi. On the other hand, only two strong and 16 weak 5S rDNA signals were visible on the chromosomes of the CCAHe2Fi male. 28S rDNA FISH revealed four strong signals in both CCAHe1Fi and CCAHe2Fi individuals. CMA3 staining revealed four to six CMA3-positive bands of CCAHe1Fi, while that of diploids contained only two to four. The fact that a polyploid hybrid Carassius female with a strong invasive potential may share morphological characters typical for endangered C. carassius highlights a need to combine genetic investigations of Carassius cryptic diversity with conservation measures of C. carassius in Europe.

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Section: Introductionmentioning

confidence: 99%

Morphologically indistinguishable hybrid Carassius female with 156 chromosomes: A threat for the threatened crucian carp, C. carassius, L

et al. 2018

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“…All species studied are considered native and with natural reproduction in the lakes where they were collected, except for H. molitrix, H. nobilis, and C. idella, which are considered non-native and do not reproduce naturally in their environment (Lusk et al 2010a(Lusk et al , 2010b. The source of the scale abnormalities in the native species has to be sought in these lakes, because the fi sh hatch and develop locally.…”

Section: Discussionmentioning

confidence: 99%

“…The freshwater ichthyofauna of the Czech Republic consists of 63 species, belonging to 16 families (Hanel 2003), and including at least 14 invasive species (Lusk et al 2010a(Lusk et al , 2010b. In our study we focused on seven fi sh species: the grass carp, Ctenopharyngodon idella (Valenciennes, 1844); the ruffe, Gymnocephalus cernua (Linnaeus, 1758); the silver carp, Hypophthalmichthys molitrix (Valenciennes, 1844); the bighead carp, Hypophthalmichthys nobilis (Richardson, 1845); the ide, Leuciscus idus (Linnaeus, 1758); the European perch, Perca fl uviatilis Linnaeus, 1758; and the pikeperch, Sander lucioperca (Linnaeus, 1758).…”

Section: Introductionmentioning

confidence: 99%

First records of scale deformities in seven freshwater fish species (Actinopterygii: Percidae and Cyprinidae) collected from three ponds in the Czech Republic

Rutkayová¹,

Jawad²,

Nebesářová³

et al. 2016

Acta Ichthyol. Piscat.

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Rutkayová J., Jawad L., Nebesářová J., Beneš K., Petrášková E., Näslund J. 2016. First records of scale deformities in seven freshwater fi sh species (Actinopterygii: Percidae and Cyprinidae) collected from three ponds in the Czech Republic. Acta Ichthyol. Piscat. 46 (3): 225-238.Background. A wide range of morphological anomalies, including abnormalities in scale shape and structure, have been described from a large number of fi sh species worldwide. Quite often, such reports linked the observed abnormalities to the quality of aquatic environment. The presently reported study was initiated to explore and categorize the abnormalities found in the scales of seven freshwater fi sh species of Czech Republic: Ctenopharyngodon idella (Valenciennes, 1844); Gymnocephalus cernua (Linnaeus, 1758); Hypophthalmichthys molitrix (Valenciennes, 1844); Hypophthalmichthys nobilis (Richardson, 1845); Leuciscus idus (Linnaeus, 1758); Perca fl uviatilis Linnaeus, 1758; and Sander lucioperca (Linnaeus, 1758). The observed abnormalities are discussed in the context of contaminated aquatic environments with the intention to understand the aetiology of the abnormalities Materials and methods. Samples were collected at 3 sites (ponds) in the Czech Republic. In total, 10 200 scales were collected, cleared in 1% potassium hydroxide, and observed under a light microscope. Four variables were measured for each scale: anterior-posterior length (major axis, MAA), dorsal-ventral length (minor axis, MIA), diameter of the focus in the centre of the scale, number of radial lines (radii) starting from near focus, and the ratio of major to minor axes were calculated as a measure of scale shape. Results. The anomalous scales, 63 in total, were collected from ten different body regions in seven species studied. They exhibited different shapes and sizes: 30 scales showed severe anomalies and 33 only slight ones. Based on the MAA : MIA ratio, the majority of the scales examined had a narrow to rectangular or broad to squarish shape. Elongated scales were only obtained from H. molitrix, H. nobilis, and C. idella. There were one square-shaped and 8 rectangular-shaped scales in G. cernua, 3 and 6 in P. fl uviatilis, and 2 and 1 in S. lucioperca Conclusions. The presently reported cases of fi sh scale abnormalities should direct the future work on the relations between the state of the environment and fi sh health. Another interesting question to answer would be to determine whether or not the removal of abnormal scales would lead to replacement by either normal or abnormal scales.

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Peculiarities of embryonic development of round goby Neogobius melanostomus (Gobiidae) in fresh water

Bonisławska

Tański

Brysiewicz³

et al. 2014

J. Ichthyol.

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The list of alien species in the ichthyofauna of the Czech Republic

Cited by 5 publications

References 4 publications

Morphologically indistinguishable hybrid Carassius female with 156 chromosomes: A threat for the threatened crucian carp, C. carassius, L

Morphologically indistinguishable hybrid Carassius female with 156 chromosomes: A threat for the threatened crucian carp, C. carassius, L

First records of scale deformities in seven freshwater fish species (Actinopterygii: Percidae and Cyprinidae) collected from three ponds in the Czech Republic

Peculiarities of embryonic development of round goby Neogobius melanostomus (Gobiidae) in fresh water

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