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Põllumajandus- ja keskkonnainstituut

Selle valdkonna püsiv URIhttp://hdl.handle.net/10492/2466

Sirvi

Sirvi Põllumajandus- ja keskkonnainstituut Autor "Aavik, Karl-Erik" järgi

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    Kirje
    Humic water effects on Eurasian perch (Perca fluviatilis) embryonic development and survival
    (Eesti Maaülikool, 2023) Aavik, Karl-Erik; Kahar, Siim (juhendaja); Noreikiene, Kristina (juhendaja)
    Eurasian perch (Perca fluviatilis) is a teleost fish species, which is able to thrive in a wide range of fresh and brackish water habitats. Among the habitats where perch successfully lives and reproduces are also highly acidic humic lakes. Perch is thus a suitable species for studying potential adaptation to humic conditions, which may bring important insights about perch ability to persevere global environmental change induced brownification of fresh water habitats. This thesis aims to answer, if embryonic survival and hatching success of perch are reduced in humic water and whether such a response is population–specific. In order to test that, perch from two humic and two clear water lakes were artificially reproduced and their eggs incubated in multidish plates, with either natural humic or clear lake water. Survival and development was observed and recorded during 13 days, which after data was statistically analyzed. Findings suggest that humic substances are likely to affect embryonic development however, the effects were not statistically significant. Secondly, the association of parentage was tested in a relation to survival and it was found that the maternal population has stronger effect on the embryonic development and survival. Thesis results share the first glance of perch embryonic survival and adaptations into extreme humic environment and can be helpful for related future studies.