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Doubletail Gene


Sherolyn-Basement Bettas

Counting the number of rays at the base of the dorsal usually gives a pretty reliable incidation whether a fish is carrying DT or not. 

When we look at the number of rays at the base of the dorsal of a wildtype Betta splendens we usually can count 8-10 rays. For example: 
Image
In more detail: 
Image
This dorsal has 10 rays at the base. 

We all know that asymmetrical (traditional) PKs and their longfinned equivalent are most close to these wildtypes. Logically the dorsals of these fish also show 8-10 rays at the base of their dorsal. For example: 
When we look at the number of rays at the base of the dorsal of a wildtype Betta splendens we usually can count 8-10 rays. For example: 
Image
In more detail: 
Image
This dorsal has 9 rays at the base. 

Doubletails are the result of a process called ventralization, whereby the dorsal fin differentiates from its normal pattern to one which reflects the anal fin and lower caudal of the singletail. In other words, the mutation replaces the top part of a fish with the bottom part, but is restricted to the anal and lower caudal. This results in really broad dorsals with double the amount of rays in comparison to a normal singletail fish. For example: 
Image
In more detail: 
Image
This dorsal has 20 rays at the base. 

The DT is intermediary inherited which actually means that it is partially dominant. This mean that fish carrying one copy of the gene are not DTs but do show some DT characteristics like an increased numer of rays at the base of the dorsal. Usually the number of rays is >10 in a DT carrier fish. For example: 
Image
In more detail: 
Image
This dorsal has 14 rays at the base. 

When we have a look at the number of rays at the base of dorsal of the fish which you posted in the spawn-log section: 
Image
We can count 12 rays, indicating that this fish defenitely is a DT carrier :D

More on this can also be read in the following article written by Dr. Leo Buss (click here): Dorsal designs





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