2021-01-18 · 4: 6: Commercial brand floating feed: 8: 9: Commercial brand sinking feed: 7: 6: Open in a separate window. 2.3. Collection of fish samples . A total of 30 fish (15 pangasius and 15 tilapia) were randomly collected from 30 different ponds (i. e. one fish per pond) to achieve more reliable findings. The sampled pangasius were aged between 8 and 10 months and