There are small perch. I always used to catch perch and small trout spinning where the brook enters the Taff above Western Avenue bridge. I am now more towards 80 than 70 and spent most of my early years on the banks of the Taff. We used to swim below Llandaff weir and come out looking like miners after a shift. The transformation in the river is remarkable. In those days there were only eels and blind roach. The water was black and the bottom was black. Just above Western Avenue bridge was a small island we called Tomato Island which was completely overgrown with Peashooters ( Japanese Knotweed ). We had to make sure we could get off the island before the tide came in !!. We’d believe anything in those days. After all that I have never seen a pike caught in the river even though we dumped some jack pike from the Wye over the bridge. Happy days!