Prawn colours still in the dark….not to mention moon cycle effect or how tidal fluctuations also could play a role…

https://www.frontiersin.org/articles/10.3389/fmars.2021.750384/full

For shrimp larvae culture full 24/7 works well – supports algal growth

Some grow out juvenile to market studies have shown 24/7 light increases chromatophores.

Some studies show colour can be changed with feed additive, tank colour, substrate.

Lots of R&D still possible…but for intensification it is way down the list…