are these shrimps matured yet if they have no colors yet?

i asked some questions about this before but i did not get a specific answer. my shrimps i just bought today dont have any colors on its transparent body except for a stripe from its head to its tail. this pattern is suppose to be the common pattern for malaya shrimps which i just bought. they should be in alot of colors like green blue black white brown red and i heard young shrimps are transparent but mine is quite large like a adult already but dont have any colors. one had orange colors and the other had blue on its tail but the other 6 dont have any color except for stripes. will they get it when they moult or when they grow older? is it that all young malaya shrimps are like this?
 
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