Identity and breeder
Neocaridina commercial breeding hypothesis — Rare Shrimp / Travis Stephenson
Published date and report type
2025 breeding guide; First-person line-development account unless noted
Illustrated breeding family / evidence tree
Reported original source stock
Guides assume normal-eye parent AA and OE parent aa, resulting black-eye carriers Aa
Reported actual crossing or selection sequence
AA × aa -> Aa F1; sibling Aa × Aa -> 1:2:1 genotype and 25% aa; backcross Aa × aa -> 50% aa (only IF monogenic complete recessivity holds)
Observed phenotype
OE phenotype under assumed aa genotype
What author claims
Commercial breeding guide says use original OE male to raise expected OE fraction compared with sibling matings
Measured brood counts
No measured generation-specific brood count provided for these quoted rates
What remains uncertain
25% and 50% are mathematical **model predictions**, not measured inheritance coefficients. OE genetic mechanism and founder genotype are not independently validated
Care, selection, authentication
Maintain lineage-specific stock labels, isolate genuine known mating pairs in a matured tank, document sex and source of each parent, hatch-date cohorts and scored F1/F2 offspring. Color and orange eye often segregate differently in breeder accounts. Record water parameters rather than assuming one eye-color gene governs body color.
Claim-level citations
- Rare Shrimp, illustrated Orange Eye breeding guide, March 2025 — Commercial cross instruction with theoretical Punnett ratios
F1 black-eye carrier and 25%/50% expected ratios depend on an unvalidated monogenic recessive inheritance assumption; no measured brood counts
- Molecular expression pathways in Neocaridina denticulata, 2026 — Peer-reviewed gene expression study in related taxon
No genotyped proof of causal orange-eye locus in named N. davidi commercial stock