STOMACH CONTENT OF WHITEFISH, COREGONUS LAVARETUS (ACTINOPTERYGII: SALMONIFORMES: SALMONIDAE), OFF THE ALAND ISLANDS, BALTIC SEA

Henry Hägerstrand, Mikael Himberg, L Saks, A Verliin

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The Aland Islands are major feeding grounds for threatened whitefish, Coregonus lavaretus (Linnaeus, 1758), in the Gulf of Bothnia, Baltic Sea. Diet of the foraging whitefish, however, has been poorly studied in this area. In the presently reported spot-check study we analysed stomach content of whitefish (n = 88), sampled by gillnets at hard bottom shallows during spring and summer (June-August) 2012. Molluscs and benthic crustaceans were the main prey items, where the rank order of abundance and biomass of food items was Theodoxus fluviatilis > Idotea spp. > Gammarus spp. > Hydrobia spp. > Mytilus trossulus > Radix spp. A shift towards T. fluviatilis was observed from June to July-August. The acquired knowledge on the diet composition could help to shed more light on the ecology of whitefish in the Baltic and may serve to indicate food web alterations due to climate variations and long-term change.
Original languageUndefined/Unknown
Pages (from-to)71–74
Number of pages4
JournalACta Ichthyologica et Piscatoria
Volume48
Issue number1
DOIs
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • stomach content
  • Aland Islands
  • prey

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