Mackerel Fishing Tenby launch daily from Tenby Harbour or Tenby’s Castle Beach, depending on the tide. Tenby in Welsh means “Little Fortress of the Fish” and it lives up to its name. Fishing trips have been sailing out of Tenby for centuries. We sail from Tenby Harbour but when the tide is out we sail from Castle Beach, which just so happens to have been the Sunday Times Best Beach of the Year 2019. The Mackerel Fishing trip lasts 90 minutes which gives you loads of time to catch plenty of Mackerel.