Check out Prawn Nitrite “Colorimetric Titration” App…

https://play.google.com/store/apps/details?id=es.inforapps.chameleon

Experimental study of nanobubbles in salt solutions – prawn ready.

Note – discovery of nanobubbles was by Royal Navy when testing torpedos. Cavitation.

http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0370-39082018000100041

Nano Graphene Camera for counting farmed prawns….

https://pubs.acs.org/doi/10.1021/acs.nanolett.1c00543#