The fishery is mentioned in medieval documents and would have consisted of a timber-framed system of fish traps with slaughter points at intervals. At Cenarth such traps ran across the top of the falls and the postholes can still be seen when the river is low, some even now containing timber. There has also been extensive hewing of the rock alongside the deep channel on the Carmarthenshire side, just below the weir, where more fish traps were located. But, in addition, the fishery at Cenarth also include the mill pond with the underground passage running from it under the mill itself and the approach road, back to the river.

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