As far as the fish are concerned, they still aren't earning a premium. In the mean time, they manage costs. The future of the Chinese market is heading towards being "qualified" and "certified". If SIAF keeps doing the right things, they will build their brand and eventually get recognized, i.e., get paid a premium.
As far as the beef, I don't know. They have Dragonhead status there. Given the Aussies will be import tax free in 5-years, SIAF is changing the model a bit and going even more premium with Waygu beef. The import tax is at least 23% so they still have room to charge a premium if the market demands it. Kind of doubt it though. I would guess they aren't getting a premium here either.