So I fishtail braid my hair a lot and I always get requests on how to do the braid style so here it is! I used pieces of craft lace rather than hair but the theory is the same.
A fishtail is essentially a braid using two sections of hair instead of three, the third strand gets taken from the outermost part of one section and crosses to the other section.
Separate into 2 sections
Separate out the outermost piece
The outermost piece from the right side crosses over to the left section
The same happens using the outermost piece from the left section crossing it to the right
Keep going alternating sections
Finished fish tail braid