It has a reputation for big fish, and in the recent past has produced very large brownies up to 9lb in weight. A photo of this fish can be seen on the Aber AA website.

It is extremely rich in insect life, and if you turn over a stone or look in the reeds you will see hundreds of hoglice. The bottom literally heaves with them. This may explains why the llyn is often dour. Cased caddis are also abundant.

The lake also has a hatch of great red sedge, which can occasionally bring large fish to the surface during the summer months.

Fly fishing, spinning and earthworm fishing are allowed on Llyn Oerfa. Access is very easy, with parking on the shore.