Half-Black
Variety
The half-black guppy is a patterned strain with a dark rear body section, often paired with a contrasting tail color such as red, blue, yellow, pastel, or green. The dark saddle usually begins around the mid-body and carries toward the caudal peduncle, giving the fish a tuxedo-like division without necessarily making the entire tail black. Different show groups may describe the ideal boundary and color coverage differently.
Half-black lines need selective breeding to keep the dark body area clean and the paired tail color bright. Crossing to unrelated strains can produce useful vigor, but it may also blur the boundary or weaken the black coverage. In aquariums, these guppies are managed like other fancy strains, with special attention to fin condition and enough grow-out space to choose breeding males after their mature color settles.
