Fish Trap (Canmore I.D. No. 41132) 1 of 10 prehistoric / medieval Fish Traps between Ardrossan and Portencross…confirmed by Canmore in 2014. Though impossible to date accurately due to the use of natural dykes and the abundance of rocks it is estimated they were used over a period of at least 3,000 years. The visibility of some of these Fish Traps are dependant on the tides. Some, like the one pictured, are now very close to the Low Water Mark and therefore can only be seen on the low tide.