I used to fish several rivers here. Mainly Tywi, Cothi, Teifi, Gwendraeth.
Mainly for Sewin ( Sea Trout) but also salmon and trout.
I am tempted to go back but reports indicate significant reduction in fish stocks. Even on quiet nights ( fishing at night for sewin) then being out spotting wildlife was compensation for no fish.
We have a monthly noggin just West of Llandeilo so you can come along.