| Autor: |
Dziewulska K; Department of Hydrobiology, Institute of Biology, University of Szczecin, Felczaka 3c Street, 71-412 Szczecin, Poland.; Molecular Biology and Biotechnology Centre, University of Szczecin, Wąska 13 Street, 71-415 Szczecin, Poland., Kirczuk L; Department of Hydrobiology, Institute of Biology, University of Szczecin, Felczaka 3c Street, 71-412 Szczecin, Poland.; Molecular Biology and Biotechnology Centre, University of Szczecin, Wąska 13 Street, 71-415 Szczecin, Poland., Czerniawski R; Department of Hydrobiology, Institute of Biology, University of Szczecin, Felczaka 3c Street, 71-412 Szczecin, Poland.; Molecular Biology and Biotechnology Centre, University of Szczecin, Wąska 13 Street, 71-415 Szczecin, Poland., Kowalska-Góralska M; Department of Limnology and Fishery, Faculty of Biology and Animal Science, Institute of Animal Breeding, Wrocław University of Environmental and Life Sciences, Chełmońskiego 38c Street, 51-630 Wrocław, Poland. |
| Abstrakt: |
Adequate selenium (Se) availability enhances the health and growth of organisms, but overdose of it can be harmful and pathogenic. The study's objective was to analyse the impact of short-term exposure of sea trout fertilised eggs to inorganic selenium (SeO 2 ) at concentrations from 0 to 32 mg Se L -1 to find the optimal and toxic dose of Se on early fish development. Se accumulated in the body, embryos' survival rate, and growth in the first four months of life was examined. Swelling of fertilised eggs in water supplemented with Se at a concentration from 0.5 to 8 mg Se L -1 was associated with a slightly positive impact on the hatching rate. At higher Se concentration, a harmful effect on the survival of the embryo was observed. The survival of fry was similar in all groups, while the fry length and weight correlated positively with Se concentration in its body. Immersion of fertilised eggs in water enriched with Se during egg swelling can constitute a method to supplement the element to non-feeding stages of fish. In selenium-poor areas, this innovative method can be implemented in aquaculture to improve breeding outcomes. Se concentration should be adjusted to the chemical compound, fish species, and Se's content in the yolk. |
