Selective Hybrids:
Selective Hybrids horonorum x nile, mossambique or aurea = all male offspring
Possible Chromosomal Incompatibility
horonorum: female = ZZ, male = ZY
most tilapia: female = XX, male = XY
example: male horonorum x female nile
ZY x XX
ZX and XY (heterozygous ZX develops as
a male)
Supermale Tilapia:
Supermale Tilapia Sex Reversal
XX x XY
XX XY
(50%) (50%)
50:50 Genotypic male:female
Feed Estrogen
XX XY
(50%) (50%)
All Phenotypic females
1st Progeny Testing:
1st Progeny Testing Phenotypic females XX and XY x XY
Breed with normal males
XX x XY XY x XY
XX XY XX XY YY
(50%) (50%) (25%) (50%) (25%)
3:1 male:female
DISCARD FEMALE BROOD KEEP MALES to BREED
2nd Progeny Testing:
2nd Progeny Testing Males XY and YY x XX Breed with normal females
XY x XX YY x XX
XX XY XY 100% male offspring
DISCARD MALE BROOD MALE BROODFISH IS SUPERMALE
Summary:
Summary