We use the metric system in Singapore too but I do know how big is an inch... I always think it's easier to size a fish by inches ...but that's just me.
1 inch = 2.5cm
Therefore, 6 inches = 15cm
nicktc;3109209; said:
Unlikely to be an orientalis as well, as the dorsal ray count is 37/38 whereas orientalis has max 34.
The anal ray count which is more than 26 also exceeds that of the orientalis.