In an organism migration facility (1) for placement in a stream, the organism migration system (1) having a first length (81), the first width (80) and first level is formed, wherein the organism migration facility (1) along the first length (81 ) at least two slot passes (2) and at least one basin (3), wherein the basin (3) is formed between each two of the at least two slot passes (2), and wherein each slot pass (2) for flow of water in a slot flow direction ( 4) a of the organism migration facility (1) covered at least slit (5) forms, is for space-saving, building cost-saving and proposed operating cost saving training the organism migration system 1 in that the slot (5) - in slit direction of flow (4) measured - slot length ( 51), which slot length (51) is between 20% and 80% of the first width (80).
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