Research Article

The Requirement and Protective Effects of Dietary Protein against Chronic Ammonia Exposure in Juvenile Genetically Improved Farmed Tilapia (Oreochromis niloticus)

Figure 2

Gill histologic alterations of GIFT juveniles fed diets with different protein levels under low or high ammonia exposure for 8 weeks (×400; ; CC: chloride-secreting cell; PVC: pavement cell; Pic: pillar cell; B: blood cell). (a) The fish were fed diet with 31.04% protein under 0.02 mg/L ammonia exposure. (b)–(g) The fish were fed diets with 22.64%, 27.26%, 31.04%, 35.63%, 38.47%, and 42.66% protein under 0.88 mg/L ammonia exposure, respectively.