The relaxed oversight in China tend to allow farms to skimp on the things that make fish farming both more productive and safe. As Tilapia are not overly picky eaters and can withstand pretty bad conditions, the fish are often raised in unsanitary ponds, sometimes literally in waste. To overcome this farmers sometimes pump them full of antibiotics to take care of any health concerns. This, however, has many noted side effects for consumers. Over-crowded tanks with limited water circulation lead to unhealthy fish that are then passed on to consumers, too. There is also the water itself that can become contaminated by not allowing enough room for the waste produced by the fish to run-off or break down. Having a stronger aquaculture standard and protocol will assist in developing safer, healthier, systems. Not only that, but it will increase the ability to provide higher yields. This will help the market meet demand for fish.
Check out the video on how Ecuador uses aquaculture to farm more effectively.