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Environmental Biology of Fishes

, Volume 27, Issue 4, pp 273–283 | Cite as

Fish reproduction and the impact of acidification in the Kyrönjoki River estuary in the Baltic Sea

  • Lauri Urho
  • Mikael Hildén
  • Richard Hudd
Article

Synopsis

Several freshwater species use the Kyrönjoki River estuary as a spawning and nursery area. The main reasons for this seem to be the morphology of the estuary, the abundance of shelter provided by aquatic macrophytes, high food production and favourable temperature conditions. Acidification of the estuary due to drainage from acidic soils has made part of the estuary unsuitable for fish reproduction. In addition, year to year fluctuations in the acidity of the estuarine water have affected the reproductive success of several species. The severity of the effects of the acidification at the population level is determined by the spatial and temporal distribution of the larvae and juveniles.

Key words

Ecology Larvae Juveniles Recruitment Nursery areas 

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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • Lauri Urho
    • 1
  • Mikael Hildén
    • 1
  • Richard Hudd
    • 1
  1. 1.Finnish Game and Fisheries Research InstituteHelsinki 15Finland

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