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Changes in condition of herring (Clupea harengus) in Swedish coastal waters
Södertörn University College, School of Life Sciences.
2010 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The condition of the herring (Clupea harengus) in the Baltic Sea has decreased during the past 30-40 years. This decrease could be explained by different factors; (1) change in diet due to changes in zooplankton community, (2) changes in water temperature and salinity, (3) increasing nutrient inputs and (4) competition for food with other species such as sprat (Sprattus sprattus). In this study the change in condition was analysed using the Fulton’s condition index, and by looking at age and sex of the fish as well as the season and locationthe fish was caught, the differences between these factors were presented. Data from the national Swedish contaminant monitoring programme where used from four locations in the Baltic Sea and two locations at the Swedish West coast. The data was analysed using multiple regressions in R Commander. The result show that the condition, and the temporal trends in condition value, varies at different locations, with higher condition values and increasing temporal trends at the Swedish West coast, compared to the Baltic Sea with lower condition values and where three of four locations show decreasing temporal trends. The condition varied between spring and autumn caught herring as well, while age and sex showed less significant differences.

Place, publisher, year, edition, pages
2010. , 30 p.
Keyword [en]
Herring (Clupea harengus), Fulton’s condition index, environmental changes, Baltic Sea
National Category
Natural Sciences Ecology
Identifiers
URN: urn:nbn:se:sh:diva-3376OAI: oai:DiVA.org:sh-3376DiVA: diva2:321435
Presentation
2010-04-14, MA 737, Alfred Nobels allé 7, Flemingsberg, 10:00 (Swedish)
Uppsok
Life Earth Science
Supervisors
Examiners
Available from: 2010-06-01 Created: 2010-05-09 Last updated: 2010-06-01Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf