You will be told by anyone who fishes it - and quite a few who don't - that it is full of big perch . I first fished it about 10-12 years ago , primarily because I grew up near the canal , when it was a polluted horror story with no fish. So it was a novelty to catch from it at all.
I have had scores of perch from the A&C , and very , very few needed a net . I'm sure there are decent fish but damned if I can catch them . I fish a mile or so either side of Heck bridge .
If you do fish it it is essential to use wire (I use Surflon 11lb knottable )as pike are often encountered . They tend to be in amazing condition - short , deep and very hard fighting .
Most of the canal is 100% featureless and varies in depth between 6ft or so ad 10/12 ft at a guess. Fish are often very close in and if you find weedbeds (often in the wider parts of the canal with mooring areas) you will find fish. In cooler weather I'd fish drop shot with small paddletails -and decent weight too. The wind can make staying in touch with leads lighter than 8g hard.
I enjoy going there - big water , big sky and (I suppose) the possibility of big fish . I've had a lot of two pound plus perch in Yorskshire , but I am still waiting to get my first from the canal.