I've also noticed this among my PRL. I've been a huge PRL fan for so long now and on many occasions when opportunity arise and funds are plentiful, I would find myself picking up a couple of PRL to add to my collection. A few things I've noticed with the PRL as of late..
1. My first generation of PRL (the oldest purchased PRL) demonstrated the BEST colors. Coincidentally, the typically Tiger Tooth or Saber Tooth (as Shrimpy Daddy has put it) has always ranked highest in terms of coloration when compared to the SSS Grades (speaking matter of factly in terms of the "OLD" grading systems based on patterns ranging from C - SSS Mosura).
2. As the PRL crazed continue to grow and become more widely available (speaking in terms of availability in NA as we are usually 2-3 years behind on all shrimping related trends) the once signature Tiger Tooth/Saber Tooth patterns have given way to the more SSS grades (almost all white with only the red heads) patterns. I found that amongst these contains the most unstable and "ugly" colors. It's at these grades that I begin to see the "yellow" and "pinkish-red" colors.
Conclusion: I do believe that the best "PRL" ranging in the lower pattern grades S-SS (No-Entry - Tiger's Tooth/Saber Tooth patterns). I feel like the way most breeders of these high grades PRL are doing somesort of genetic mixing (what mixing and combination, I do not know) but it has brought forth a lot of genetic instability tainting in the once good PRL name. As such, I don't even bother with the fancy (and often heavily marketed and advertised) SSS Grade PRL with the red head and complete white bodies and white legs. I found that 90% of the time they look grade in pictures but are lacklustre in person.
I just want to add that the JRB and JBB (Japanese Black Bees or should it be Japanese Black Line?) all arrived safely and is currently undergoing the acclimating process. I'll be able to add them to my tanks in a few hours.
And yes, the "PRL" I purchased from HK a year ago are terrible (similar to the SSS PRL I bought from a local importer a few months ago) and have been kept separated inside their own breeder box. I found the pinkish - yellow color really ugly and so I've made little effort to continue working on them.
Id like to add some iPhone pictures of the JRB I hand selected while in Japan.
Also, while I was in Japan I noticed that of the 4 top tier JRB tanks (prices ranging from ¥30000-50000) 3 of said tanks consisted of all Red Legged JRB with patterns ranging from Hino No-Entry - Tiger's Tooth/Saber Tooth.
Examples:
Winners I hand picked:
Disclaimer: I know these pictures can look subjective as it's not a macro photography and iphone photos don't say much, but I do plan on getting a few pictures of these guys with my X-T1 + Macro lens when they acclimate and color up.