"Mixed colours always turn brown or clear in two generations"
Use the complete answer. A verdict without its boundary and next action can become another myth.
What is supported
mixing undocumented breeding populations can reduce consistency when selection and records stop.
What is not established
every named-line cross has one phenotype or reaches it on a universal F1 or F2 calendar.
What to do next
choose display or breeding as the goal, record parents and follow all offspring beyond one generation. Use the colour-crossing guide.
Exact evidence trace
This is the selected claim-level trace, not every source used by the broader guide. Roles describe how each record is used here; they are not quality grades.
Evidence records
- interpretive context Brothers are better than nothing: first report of incestuous mating and inbreeding depression in a freshwater decapod crustacean: Shows that documented relatedness and reproduction require actual crosses and outcomes.
- interpretive context Assessment of potential trade-off between maternal colouration and offspring quality in the ornamental red cherry shrimp: Measures maternal coloration and offspring endpoints without producing named-line segregation ratios.
- interpretive context The occurrence process of chromatophores in three body color strains of the ornamental shrimp Neocaridina denticulata sinensis: Describes chromatophore development in three strains without predicting arbitrary named-line crosses.
Supporting authorities
- Neocaridina davidi (Bouvier, 1904), AphiaID 1579333: Keeps accepted species identity separate from trade-line inheritance.
Named open questions
- How do named aquarium colour lines segregate in F1, F2 and backcross generations? Molecular pigment studies do not provide inheritance ratios for trade lines, and seller charts are not pedigrees.
Inspect the broader guide evidence dossier for all records, authorities, gaps, searches and changes connected to the practical guide.
Share the complete answer
Open the plain-text answer or open the original teaching card.
The detailed guide owns the evidence and limitations. Challenge this claim with a stable source if an important boundary is missing or stale.