Rhosneigr has fishing in Porth Trecastell (Cable Bay), which is a popular rock mark. There is also a small sandy beach which is seldom fished, being very shallow.

Fish include bass, cod, whiting, coalfish, pollock, conger, bullhuss, rays, codling, mackerel.

Porth Trecastell is off the A4080 south of Rhosneigr. There is a car park above the beach, with a brown sign for “Barclodiad y Gawres”.

Rhosneigr also offers fishing from Traeth Cymyran (Cymyran Beach), Traeth Crigyll (Town Beach), Traeth Llydan (Broad Beach) and rock marks including Ty Croes.