Cherry Shrimp Color Genetics: Is Blue a recessive or dominant trait?

How is the color trait, blue and red, genetically determined? I bred fire-red females with blue dream males, and obtained dark colored F1 offspring. Then I bred them together to obtain F2 offspring. At very beginning, F2 babies are colorless, then some babies obtained red or blue colors. As babies continued to grow bigger, darker color shrimplet appeared. These observations suggested that Blue and Red are co-dominant traits, and dark hybrid's color is due to co-expression of blue and red pigments.

[@francoissevestre3893]

Theory: Red color is most likely due to carotenoid pigment while Blue is likely du to iridophore pigments, which is another family of pigment. Their accumulation are therefore probably driven by different genes. So your F0 is probably something like RRbb X rrBB, F1: RrBb and if i'm not wrong the F2 should have 1/16 of RRBB shrimps with both fully expressed pigments, 3/16 of blue, 3/16 of red and 9/16 of brown.

[@cherryshrimplovegreenhairalgae]

Your theory that Blue and Red are controlled by 2 different genes (at 2 different loci) are very interesting, and I believe it should be true. I did observed F2 have pure red, pure blue, dark/black (like F1), and some with intermediate color patterns. It is very hard to know the ratios due to: 1). shrimp are keeping hiding and swimming; 2). color of the same shrimp may change after molting; 3). color of the same shrimp may change during development, including ageing.
From my other hybrid breeding, it shows that Yellow is also a co-dominate trait as Red. Now I am interested to know if we bred Green Jade or Black Rose (pure line) with Red, what will the color patterns of their F1 (and F2) be?
Thank you very much for your interesting theory.

[@rododell9858]

Ya, what he said. 😂

[@user-vw1zp6tq6z]

GREGOR IS THAT YOU?@@cherryshrimplovegreenhairalgae