Even though mass selection has been found to be more efficient than selection for relatives in fish, the advantages of the latter in selection for certain characteristics like fat content has been demonstrated. For characters like weight, it appears possible to follow a combined selection programme, which may consist of:
a) performing mass selection among finger-lings or two-year-old fish with a great severity coefficient,
b) progeny testing of males through to maturity, since males often mature earlier than females,
c) family selection with a simultaneous breeding of five to ten families and
d) repeated performance of mass selection in the best families.
Such a scheme allows summing up of the efficiency of mass selection and selection for relatives in a relatively short time.