Incubation media modify silver nanoparticle toxicity for whitefish (Coregonus lavaretus) and roach (Rutilus rutilus) embryos

AbstractThree previously undescribed species of wageneri group of Gyrodactylus Nordmann, 1832 (subgenus Limnonephrotus, Gyrodactylidae, Monogenoidea) related to G. lavareti Malmberg, 1957 are described here. G. pomeraniae sp. nov. was found on roach (Rutilus rutilus) in Poland and Belgium, G. ouluensis sp. nov. on roach in Finland and G. salvelini sp. nov. on Arctic charr (Salvelinus alpinus) in the Lake Inari, Finland. A molecular redescription of G. lavareti on Coregonus lavaretus is also presented, and G. bliccensis on Alburnus alburnus from river Morava, Czech Republic is included in the phylogenetic analysis. In addition, a hybrid clone of maternal G. pomeraniae sp. nov. and paternal G. lavareti found on farmed rainbow trout (Oncorhynchus mykiss) is characterized. The molecular species description was based on the complete CO1 gene of the mitochondrial DNA, and on phylogenetic comparison of the internal transcribed spacer segment (ITS1-5.8S rDNA-ITS2) of nuclear ribosomal DNA. The species hosted by cyprinids were basal in the phylogeny rooted by numerous relatives of wageneri-species group.

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Seasonality, littoral versus pelagic carbon sources, and stepwise 15N-enrichment of pelagic food web in a deep subalpine lake: the role of planktivorous fish

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2013-0178 ◽

2014 ◽

Vol 71 (3) ◽

pp. 436-446 ◽

Cited By ~ 11

Author(s):

Anna Visconti ◽

Pietro Volta ◽

Amedeo Fadda ◽

Antonio Di Guardo ◽

Marina Manca

Keyword(s):

Carbon Sources ◽

Rutilus Rutilus ◽

Fish Growth ◽

Planktivorous Fish ◽

Food Sources ◽

Coregonus Lavaretus ◽

Muscular Tissue ◽

Roach Rutilus Rutilus ◽

Subalpine Lake

While the role of littoral food sources in shallow lakes has been widely investigated, uncertainties still exist about the relevance of such sources for deep lakes. Here we report quantitative estimates for the contribution of littoral versus pelagic sources in supporting the three most important planktivorous fish of a deep, large, subalpine lake in Italy. Contributions of pelagic (p) and littoral (q) signatures of δ13C and δ15N stable isotopes were detected in fish muscular tissue by applying a dynamic baseline mixing model. This model integrates tissue-specific metabolic turnover (m) and fish growth (k) rates over baselines δ13C seasonality. Annual fluctuations for both pelagic and littoral baselines were not negligible (ΔC = 10‰ and 8‰, respectively). We calculated that they could not be ignored, since contributions of pelagic and littoral signatures would be largely underestimated (up to 30% p and 13% q for whitefish (Coregonus lavaretus) and roach (Rutilus rutilus), respectively). When fish relied upon pelagic consumers, stepwise 15N-enrichment (E) of pelagic preys linearly decreased with prey-size-specific predation pressure. Therefore, longer food webs would be proportionally less stepwise 15N-enriched than shorter ones.

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Concentration of mercury in muscles of predatory and non-predatory fish from lake Pluszne (Poland)

Journal of Veterinary Research ◽

10.1515/jvetres-2016-0007 ◽

2016 ◽

Vol 60 (1) ◽

pp. 43-47 ◽

Cited By ~ 9

Author(s):

Joanna Łuczyńska ◽

Marek Jan Łuczyński ◽

Beata Paszczyk ◽

Elżbieta Tońska

Keyword(s):

Correlation Coefficients ◽

Perca Fluviatilis ◽

Absorption Spectrometry ◽

Rutilus Rutilus ◽

Point Of View ◽

The Body ◽

Predatory Fish ◽

Coregonus Lavaretus ◽

Roach Rutilus Rutilus ◽

Commission Regulation

Abstract Introduction: The study examined the concentration of total mercury and correlation coefficients between fish size or FCF (condition factor) and the content of Hg in muscle tissue of six freshwater fish: bream (Abramis brama L.), roach (Rutilus rutilus L.), whitefish (Coregonus lavaretus L.), vendace (Coregonus albula L.), perch (Perca fluviatilis L.), and pike (Esox lucius L.). Material and Methods: The fish were caught from the Lake Pluszne located in the Olsztyn Lake District (Poland). Mercury was analysed by atomic absorption spectrometry using Milestone DMA-80 (with dual-cell). Results: The content of the element in the muscles of the examined fish was as follows: pike (0.197 mg/kg) ≈ perch (0.173 mg/kg) > vendace (0.114 mg/kg) ≈ roach (0.095 mg/kg) and roach ≈ whitefish (0.065 mg/kg), and whitefish ≈ bream (0.042 mg/kg) (p ≤ 0.05). In all cases, the content of mercury correlated positively with the body weight and total length of the fish. Only the correlation coefficients between mercury concentration and weight or length of bream were slightly higher (0.979 and 0.977 respectively, p ≤ 0.001). The length and weight relationship of the fish was also determined. Conclusion: The results showed that the levels of mercury were lower than the maximum acceptable limit established by the Commission Regulation (EC) No 629/2008 of 2 July 2008. Thus, they are safe from consumer health point of view.

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