Archipelago Research Institute (ARI) belongs to the Biodiversity Unit of the University of Turku (UTU). ARI is located on an island in the middle region of the northern Baltic Archipelago Sea. The Institute participates in multidisciplinary research of the Baltic Sea, with a special focus on the Archipelago Sea. Since its foundation in 1964, ARI has conducted long-term environmental monitoring and offers various research services for researchers, students and course participants. Research at ARI comprises of projects studying, for example, the biological and geological condition of the Archipelago Sea, and the island's historical background as a hospital island for people suffering from leprosy and mental illnesses. ARI provides TA services for ASSEMBLE Plus, for which the University of Helsinki (UH) is the Finnish partner.


  • Baltic Sea ecosystems (brackish water ecosystems characterised by vast archipelagos with high habitat complexity)


Ecosystem access

  • Coastal research vessels
    • Finnish open sea, Seili, Archipelago
    • Research vessel R/V Aurelia (18.1 m), suitable for entering shallow coastal areas
    • Five smaller boats such as Seili 5 (10.5 m) and Seili 1 (8.05 m)
  • Sampling equiment
    • All vessels come with sampling equiment
  • Scuba diving facilities
    • Finnish open sea, Seili, Archipelago

Ski-doo and Ice-skinner available

Experimental facilities 

  • Aquaria and tanks 
    • Marine experimental ecology infrastructure with flow-through aquaria and indoor and outdoor mesocosm facilities
  • Dry labs and wet labs
    • Suitable for running ecological experiments
    • Seawater (6 PSU) is supplied to the laboratories via pipes
    • Standard sampling and laboratory equipment for marine research
      (e.g. water samplers, plankton nets, microscopes, sediment corers and grabs, CTD and side scan sonar) 


Technology platforms

  • Imaging
    • Optical microscopy for Baltic sea zooplankton analysis and ZooScan



  • Data sets
    • Environmental and at-sea monitoring from the Päiväluoto sampling station in Seili.
    • Osprey nests
    • Seili weather station
    • Zooplankton monitoring samples since 1966, with corresponding temperature and salinity data


Expert advice

  • Biological sample identification
    • Sample identification of Baltic Sea zooplankton and benthic fauna


Supporting facilities

  • Library services
  • In-house lodging
  • In-house catering

The station is operational all year around. Accommodation and restaurant services at Seili are available through a travel company Skärgårdskompaniet Oy Ab. ARI also offers cabin accommodation for small research groups in the neighboring islands.


Archipelago Research Institute
20014 Turun yliopisto
Liaison officer: Jari Hänninen (, cc to:

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