Try PM-ing http://forum.lowyat.net/user/ParaOpticaL
He had been active in fish breeding (but don't know whether or not he rears keli)

Anyway, this is their topic: http://forum.lowyat.net/index.php?showtopic=404328&hl=

If we look into this topic more, it had been not only discussing about solely catfish. It had ventured into rearing of edible fish for general consumptions.

There used to be another topic also on aquaculture: http://forum.lowyat.net/index.php?showtopic=404328&hl= which have lots of information on business strategies, pond designs, etc... Thus previously I did tried to divert you guys there.
However, since it had not been that active as it used to be; I left this topic open.

Try to contact http://forum.lowyat.net/user/ParaOpticaL like I mentioned in the 4th post.
He is into fish breeding and I believe they still have their usual gatherings among breeders. So you might be able to join them and learn from experience.

Most of the general restaurant are serving fresh water fish.

I've PMed Paraoptical and he say he would drop by this topic when he's free. Apparently he's busy these days.