Question - Do fish have life long specific physical features all unique to a specific individual fish? No other fish ever hatched has this specific something...

Kinda like a finger print we have.

Reason being, is there is quite a bit of stuff out there that can optically scan something and give pretty much a 100% ID all the time.

Look at 3D barcode readers that are in very high speed production lines. All they look for is a pattern.

Pattern is physical, but not dependent on size, but the same pattern.

Just curious is all.