Breeding was performed in the laboratory
of G. Hulata at the Volcani Center, Agricultural Research
Organization, Bet Dagan, Israel. A red O. niloticus male derived
from the University of Stirling stock (McAndrew and
Majumdar 1983) was crossed with a normally colored O.
aureus female from an Israeli strain (Lee et al. 2004). Fingerlings
were shipped to the University of New Hampshire, where
they were raised to sexual maturity (mean weight, 149 g) and
DNA was extracted. The F2 family consisted of 156 offspring of
which 90 individuals were used for genotyping (Lee et al.
2005).