
Pentapodus caninus - Small-toothed Whiptail
It was also displaying some dark blotches as it was preparing for the night and many fishes change to darker coloration during night time.
Another example you can see is in Diverosa web site:
https://www.diverosa.com/categories/fishes, Coral breams/L/IMIb-234_Pentapodus_caninus_Big-tailed_besugo_night_coloration.jpg

A fish of the Nemipteridae family. The juvenile displays bluish body with two lengthwise yellow bands, with the upper thinner than the lower. Colorless as an adult.
Similar species: Perch-like Fishes
By Patomarazul
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Uploaded Jan 20, 2020. Captured Oct 2, 2015 02:47 in Malaysia.