Fin device for a watercraft with a carrier which - in the position of use of the watercraft - points downwards starting from the bottom of the watercraft and in its end region which then points downwards comprises a device for the reversible and pivotable mounting of a fin blade, the fin blade is straight or curved and has a length in the range from 10.0 cm to 60.0 cm, the axis of rotation of the carrier having a depth below the carrier holder which is in the range from 3.0 cm to 25.0 cm The axis of rotation on the one hand and the longitudinal axis of the watercraft on the other hand - in a plan view of the underside of the watercraft - enclose an angle in the range of 70 ° to 110 ° and the carrier indirectly via a carrier bracket or directly on or on or in the underside of the watercraft can be attached reversibly.
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