I just took these three photos with the same lighting against the same background. The first is of an imported (presumed wild-caught) orange shrimp. The third photo is a grey offspring of one of the imported adults, raised in freshwater, here:
That’s all stuff I’ve written about before. The middle photo, though, is also of an f1, raised in brackish water, here:
These are the offspring that I forgot about — I determined that they had all died as zooes, and when I discovered adults in the brackish tanks later they seemed to be doing fine so I let them be. Now, months later, they are still growing, and still healthy… and yellow.
Frustratingly, I noticed this a bit too late. There were originally two brackish tanks of different salinities with shrimp growing up in them. A few weeks ago I merged the two tanks in order to save space. It would’ve been nice to have a few more data points to verify that color increases with salinity.