Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants Chara Giving Tilapia an Off Flavor

Chara causing an off flavor is probably urban legend and "assumed" since common farmed fish, like catfish flavor is affected by foods eaten.

If an off flavor is found in tilapia fillets, it is likely from intestinal fluid contamination.

Purging only clears the intestinal tract, again, the main source of contamination causing any off flavor. And if your aquaponics has tap water clear water, it will be good for purging.