I found that I could enjoy the sashimi of Barramundi under the condition as follows,
1. The sea Barramundi should be a very salt water fish.
2. Keeping fish cold is crucial in order to preserve freshness.
Iki jime aka spiking a good online guide… Humanely killing your catch | Fishing in South East Australia
I caught a 62cm very salt water Barramundi this evening.
This fish didn't smell the fishy fresh water.
Please click on the " Fishing of Ranking" link.
Thank you very much.