3.2. Heritabilities and correlations for reproductive traits
For the reproductive traits recorded, heritability estimates ranged from 0.18 for hatch rate to 0.47 for days to spawn (Table 2). All phenotypic correlations were
low and not significant except for a strong and positive
correlation between hatch rate and nauplii number,
which also gave a significant genetic correlation. The
analysis indicates that egg number has a negative genetic correlation with hatch rate, but like most other
genetic correlations it was associated with large standard
errors (Table 2).