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Open access

Ganna Sych, Patrick Frost and Ilgiz Irnazarow


β-glucan (Macrogard®) was administrated to enhance the immunity and growth of Cyprinus carpio fry. The whole body homogenate of fish sampled with one week intervals during 2nd - 6th weeks post hatching was assayed for the total protein content, lysozyme activity, α-2-macroglobulin content, classical complement pathway activation, and weight gain. After the 3rd week of experimental feeding, the total protein content and the classical complement activity of fish fed β-glucan supplemented diet were higher than controls. Significantly higher lysozyme activity and α-2-macroglobulin levels were noted in group fed β-glucan at the 2nd and 3rd week of diet application. It was demonstrated that β-glucan enriched feeding increased the immunity of common carp at the earliest stages of their development.

Open access

Teresa Kamińska-Gibas, Ilgiz Irnazarow, Joanna Szczygieł and Patrycja Jurecka


Introduction: Genes related to iron metabolism play an important role in inflammatory response. The objective of this study was to investigate the role of ferritin, transferrin receptors 1a and 1b, and transferrin genes in the response to blood parasite infection in common carp (Cyprinuscarpio L.).

Material and Methods: Two genetically distinct carp groups were used: R3 carp, which are established as being sensitive to parasitic infection, and SA carp (Cyprinus carpio haematopterus) of wild origin. An established challenge model with Trypanoplasma borreli was applied. Challenged carp were sampled to determine their expression levels of transferrin receptors 1a and 1b, ferritin, and transferrin mRNA. Mortality and serum iron concentration were also measured.

Results: The study revealed contrasting differences in the expression profiles of all key iron regulatory genes except the transferrin gene. In the case of other parameters, significant differences were also observed.

Conclusion: Our results demonstrate that the level of parasitic infection depends on the blood iron status. This parameter was related to the origin of the fish.