Search:

Perch, tench and rudd (Auckland/Waikato only) are "game fish", so you do need F&G license to fish for them. It doesn't make a lot of sense to me as they are not stocked or managed as far as I can...

Rudd are not considered good to eat, at least not in the western world. Perch can be good depending on their environment, clear water, koura-fed etc. Don't know about catfish. You won't go far wrong...