Kroonisen mangaanisulfaattialtistuksen (MnSO4) vaikutus seeprakalojen lisääntymiseen ja pituuskasvuun
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2023Access restrictions
The author has not given permission to make the work publicly available electronically. Therefore the material can be read only at the archival workstation at Jyväskylä University Library (https://kirjasto.jyu.fi/collections/archival-workstation).
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© The Author(s)
Many metals, such as manganese, are essential for fish. As their concentration
in aquatic environment increase, they can cause several reproductive and growth
challenges among exposed individuals. The effects are different for different sizes
of fish and in different populations and, particularly as fishing pressure affects the
size of individuals, it is important to study how different levels of exposure affect
different sizes of individuals. In this observational study, the reproduction and
length growth of zebrafish (Danio rerio) of small and large selection lines exposed to
manganese sulphate (MnSO4) were investigated at different levels of manganese
sulphate exposure (control, 0,017, 0,05, 1,5, 3,5 and 7,5 mg/l). The number of eggs
and the proportions of dead, unfertilized, and live eggs and egg survival were
observed. For length growth, the length of fish was observed weekly from 77 days
to 161 days. The length growth of individuals was also compared with that of the
mother fish, to detect a transgenerational effect. Statistically significant differences
in exposure were observed between the sampling lines in terms of number of eggs,
number of deaths and survival. For growth, no statistically significant difference
was found between the selection lines for different exposures. However, exposure
affected the growth of both selection lines equally. Manganese sulphate exposure
may affect the reproduction of individuals of different sizes based on this study.
...
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