D4 Published development or research report or study
Taimenen mädin säilyvyys ja alkioiden kasvu Savijoen kipsinlevitysalueella (2019)


Arola, Hanna (2019). Taimenen mädin säilyvyys ja alkioiden kasvu Savijoen kipsinlevitysalueella. Jyväskylän yliopiston bio- ja ympäristötieteiden laitoksen tiedonantoja, 1/2019. University of Jyväskylä. http://urn.fi/URN:ISBN:978-951-39-7724-5


JYU authors or editors


Publication details

All authors or editors: Arola, Hanna

eISBN: 978-951-39-7724-5

Journal or series: Jyväskylän yliopiston bio- ja ympäristötieteiden laitoksen tiedonantoja

ISSN: 1795-6900

eISSN: 2669-8986

Publication year: 2019

Number in series: 1/2019

Number of pages in the book: 29 sivua

Publisher: University of Jyväskylä

Publication country: Finland

Publication language: Finnish

Persistent website address: http://urn.fi/URN:ISBN:978-951-39-7724-5

Open Access: Publication published in an open access channel


Abstract

In 2016, University of Helsinki and Finnish Environment Institute started a project SAVE ”Saving the Archipelago Sea by applying gypsum to agricultural fields” to investigate the effects of gypsum treatment of agricultural fields on aquatic environment. Project SAVE was among the key projects of the Finnish Government, and The Finnish Ministry of Environment funded the project. The gypsum, i.e. calcium sulphate, treatment has decreased the phosphorus loading from the fields, but also tripled the sulphate concentration of the River Savijoki that intersects the pilot area. High sulphate concentration is known to be detrimental to aquatic organisms, such as fish. Thus, University of Jyväskylä investigated the effects of gypsum treatment on early life stage survival and growth of brown trout (Salmo trutta) by an in situ incubation method. The incubation experiment was started in October 2017 and finished in May 2018. Incubations were done at three sites. Savijoki sites included a reference site upstream from the gypsum treatment area and a gypsum treatment affected site. A second reference site representing a woodland catchment was in the nearby River Järvijoki. The gypsum treatment was expected either to increase the egg survival due to decreased loading of suspended solids, or to decrease it due to the higher sulphate concentration of the stream water. Survival was low at all study sites. In April, the mean survival was 7, 13 and 26 % at the Savijoki reference, gypsum-affected and Järvijoki reference site, respectively. All living embryos were hatched by May, but the survival had further decreased. By the end of May, living individuals were not observed at either of the Savijoki sites, and at the Järvijoki site the mean survival was 9 %. Sand had accumulated in every incubation cylinder, which likely decreased the survival. The embryonic and larval growth depended mainly on the accumulated degree days, and no notable difference in the total length of the individuals was observed among the three sites. The effect of the gypsum treatment could not be assessed due to the accumulation of sand. It would be worthwhile to repeat the experiment, since the weather conditions were somewhat exceptional during this incubation period.


Keywords: sea trout; fish roe; sulfates

Free keywords: brown trout; in situ fish egg incubation; project SAVE; sulphate


Contributing organizations


Ministry reporting: Yes

Reporting Year: 2019


Last updated on 2020-09-07 at 11:53