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Hydrobiologia

, Volume 322, Issue 1–3, pp 57–64 | Cite as

Fishery of Lake Ladoga — past, present and future

  • Leonid K. Kudersky
  • Juha Jurvelius
  • Markku Kaukoranta
  • Pekka Tuunainen
  • Kyösti Mäkinen
Present State of Lake Ladoga

Abstract

The post-war fishery of Lake Ladoga can be divided according to its catch level into four periods. In the years 1945–1954 the total annual catch increased, and reached the level of 4000 tonnes. In this period the fish stocks that had increased during the war years were intensively exploited. However, this fishery was not in balance with the stocks during the period 1955–1963. As a consequence, the catch decreased drastically, being sometimes less than 2000 tonnes.

Controlling the fishery restored the abundance of whitefish Coregonus lavaretus (L.) and zander Stizostedion lucioperca (L.). This increased the total annual catch to about 5500 tonnes in 1964–1989. However, the fishery control measures have not been sufficient to achieve the conservation of salmon Salmo solar L. m. sebago, brown trout Salmo trutta L. and the migratory lake whitefish stocks.

A decrease in the total fish catch has been observed since 1990. This decrease may be related to the deterioration of the environment of Lake Ladoga, caused by anthropogenic factors. The unfavourable state of the ecosystem has led to decline of the whitefish stocks and, especially during the last few years, to drastical decline of zander.

Acute problems, to be faced in the near future, are connected with the hatchery maintenance of several river-spawning stocks, e.g. salmon, brown trout and migratory whitefish, because the existing fish hatcheries are insufficient in capacity and technically outdated.

Key words

fish stocks fishery eutrophication pollution Lake Ladoga 

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Leonid K. Kudersky
    • 1
  • Juha Jurvelius
    • 2
  • Markku Kaukoranta
    • 2
  • Pekka Tuunainen
    • 2
  • Kyösti Mäkinen
    • 3
  1. 1.State Research Institute on Lake & River Fisheries (GosNIORKH)St. PetersburgRussia
  2. 2.Finnish Game and Fisheries Research InstituteHelsinkiFinland
  3. 3.Rural Business District of North KareliaJoensuuFinland

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