Fish Passage. 1. Each branch of a river where fish moves must have a fish passage at the deepest point in the water. The width of the fish passage must be a third of the width of the water during the usual low water period. A fish passage in a watercourse flowing into the river in accordance with the legislation of the relevant country shall continue at the same width all the way to the fish passage in the river. 2. A fishing gear or other device may not be placed or used so that the movement of fish in the fish passage may be prevented or fish cannot access the passage or move in it. When fishing in a fish passage using a specific type of drift net ("kulkuverkko" or "▇▇▇▇▇" in Finnish) at least half of the width of the passage shall be open. If a certain party has a specific right to close a fish passage for fishing, this right shall remain.
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Sources: Agreement Between Finland and Sweden Concerning Transboundary Rivers, Agreement Concerning Transboundary Rivers