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Merikoski Fish Ladder: A Passage for Aquatic Life

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Observe migrating fish journey upstream at Finland's longest fish ladder, a unique blend of engineering and nature in Oulu.

The Merikoski Fish Ladder in Oulu is Finland's longest fish pass, built in 2003 to allow migratory fish to bypass the Merikoski power plant and reach the upper stretches of the Oulujoki River. This 750-meter structure with 64 steps provides a unique opportunity to observe various fish species, including salmon and trout, as they journey upstream.

A brief summary to Merikoski Fish Ladder

  • Monday 12 am-12 am
  • Tuesday 12 am-12 am
  • Wednesday 12 am-12 am
  • Thursday 12 am-12 am
  • Friday 12 am-12 am
  • Saturday 12 am-12 am
  • Sunday 12 am-12 am

Local tips

  • Visit during the fish migration season (May-October) for the best chance to see salmon and trout navigating the ladder.
  • Check the Oulun Energia website for the opening times of the observation room to view the fish underwater.
  • Bring binoculars for better viewing of the fish in the different sections of the ladder.
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Getting There

  • Walking

    From the Oulu city center, the Merikoski Fish Ladder is accessible by foot. Head east towards the river and follow the signs for Hupisaaret park. The fish ladder is located within the park, adjacent to the Merikoski power plant. The walk is approximately 15-20 minutes from the central market square.

  • Public Transport

    Several bus lines serve the area near the Merikoski Fish Ladder. Check Oulun seudun liikenne (OSL) for the most up-to-date schedules and routes. From the city center, take a bus that stops near Kasarmintie. From there, it's a short walk to the fish ladder through Hupisaaret park. A single bus fare within Oulu is approximately €2.60 when paid with a contactless bank card or the OSL app.

  • Taxi

    Taxis are readily available in Oulu. A taxi ride from the Oulu city center to the Merikoski Fish Ladder will take approximately 5-10 minutes, depending on traffic. The estimated cost is between €15-€25.

Discover more about Merikoski Fish Ladder

The Merikoski Fish Ladder, a 750-meter-long structure, stands as a testament to ecological engineering in the heart of Oulu. Constructed in 2003, it is the longest fish pass in Finland, created to enable migratory fish to navigate past the Merikoski power plant and access the upper reaches of the Oulujoki River. The ladder consists of 64 steps, rising 11 meters in total, allowing fish to overcome the obstacle presented by the power plant. The fish pass is divided into three sections: the entrance from the old bundle driving channel next to the power plant, the ascent groove in the riverbed, and the final landscaped section in Hupisaaret park. An observation room at the end of the pass offers visitors an underwater view of the fish. A webcam also allows for remote viewing of the fish. Since its opening, the fish ladder has facilitated the upstream migration of over 16,000 salmon and 3,000 trout, along with other species like perch, bream, and roach. The best time to observe the fish is from May to October. The structure has become a landmark, increasing the scenic value of the Hupisaaret park and providing a valuable research location.

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