Body Defects (Immediate Cull)
Spine curvature, lop-sided swimming, deformed jaw, missing fin, sunken belly.
These defects are genetic — breeding them continues the problem.
Color Defects
Muddy or blurry patterns, wrong color for strain, uneven body coverage, washed-out intensity.
Color is what buyers pay for. Weak color goes to pet quality at best.
Tail Defects
Ragged edges, folded tail, asymmetric shape, too-small size, incomplete spread.
For delta-tail strains, anything less than 60° spread is cull.
What "Cull" Means
Not killing — re-homing or selling as pet-quality. Local fish stores often take mid-grade guppies.
Small-bodied deformed fish that cannot thrive humanely should be euthanized (clove oil overdose).