Firstly let us understands what does ZZ mean. ZZ = zenzu (mandarin) = pearls. So what is a ZZ pearls? As you can see the earliest of ZZ do not have any pearls dots on their body so how did they come about the name pearls? For your information, the pearls on the ZZ means the each dark flowerline found on the ZZ body which was surrounded by some metalic hue & glow which resemble a black pearl shine. You may want to get back to your ZZ flowerhorn now to know what I am saying.
Ok, so it is the flowerline that determine the grade of a ZZ.
Grade A - flowerline should be more than 75% to 100%.
Grade B - flowerline should be more than 50% to 75%.
Grade C - flowerline which are less than 50% or only a few dots.
From Grade A, we could gradually know if the ZZ is going to be a AA or AAA later by determining the growth traits of the fish with the written explanation.
1. Kok - the bigger the better.
2. Colors - the more solid & colorful the better.
3. Body - the stout & thicker the better.
4. Finnage & Tail - Balance & proportion.
5. Flowerline - the darker & more shiny pearls surround it the better.