What Are My Bettas Fins Called?
What are Rays? and what significance do they have?
Different tail types have different amounts of rays. VT's, usually have two, as do CT's (though sometimes they can have more - up to 4 or even 8 sometimes). HM's have been know to have as many as 16 , but usually have 6 to 12. A HM with only 4 - 6 rays would most likely be classified as a delta or super delta. PK's generally have two (traditional PK's) and HMPK can again have 4-8. When you look for rays, they always start off at the base of the fin as one big ray, then branch off about 1/4 to halfway down the main ray. It's the branching you want to count. It can be tricky to see sometimes.
Here's a pictures to show you what I'm talking about.
I have highlighted this Halfmoon Plakats Rays, as you can see he has 4 rays. A Bettas Fins are measured by the highest ray count. So it could have a few rays with 4, and a few with two, but would still be classified as a 4-ray.