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Katadrom fisk

Katadrome fisk lever en del af deres liv i ferskvand og en del af deres liv i saltvand.

De klækkes i havet, emigrerer til frisk vand og vende tilbage til havet, når det er tid, at de vil yngle. Kendte katadromiske arter er ål, især de truede europæiske ål.

Som voksen, gør det en stor vandring til Sargassohavet for at gyde en eneste gang før det dør i havet. Katadrome fisk vandrer dvs. fra havet til ferskvand, og tilbage til havet.

Anadrome fisk gør det modsatte. De migrerer fra ferskvand til havet og tilbage igen.

 

Livssyklus til ål, en katadrom fisk

Foto: Salvor Gissurardottir, CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0), via Wikimedia Commons.

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