Direct production of monosex populations by administration

of anabolic steroids.

FRY

ANDROGENS

ALL MALES

FRY

ESTROGENS

ALL FEMALES

Fig. 5.1.1Source: Tave, D; (1986)

Schematic diagram of the protocol needed to produce YY supermales by creating sex-reversed broodstock that are capable of producing all-male populations.

FRY

ESTROGENS

XX ♀ AND XY “♀”

XX ♀ XY ♂xXY “♀” XY ♂x

PROGENY TEST TO IDENTIFY XY “FEMALES”

50% ♀

50% ♂

CULL

25% XX ♀

50% XY ♂

25% YY super ♂

CULL

PROGENY TEST TO IDENTIFY YY SUPERMALES

XX ♀ XY ♂x

50% ♀50% ♂

CULL

XX ♀ YY super ♂x

100% XY ♂

KEEP YY SUPERMALESFig. 5.1.2

Source: Tave, D; (1986)

Egg

Sperm

UVSPB

Shock

2N

MEIOTIC GYNOGEN

Fig. 5.2.1Source: Tave, D; (1986)

Egg

Sperm

UVSPB

Shock

N N

2N

MITOTIC GYNOGEN

N

Fig. 5.3.1Source: Tave, D; (1986)

SPBEgg

Sperm

UVN

Shock

N N

2N

ANDROGENESIS

Fig. 5.4.1 Source: Tave, D; (1986)

Another way of getting Androgen

gametes 2N

Tetraploid Male 4N

Fig. 5.4.2Source: Tave, D; (1986)

SPBEgg

Sperm (2N)

UV2N

Egg

Sperm

SPB

Shock

3N

TRIPLOIDY

Fig. 5.5.1

Source: Tave, D; (1986)

Another way of getting a TRIPLOIDY

gametes 2N

gametes N

Offspring all 3N

Tetraploid Female 4N

Diploid Male 2N

Tetraploid Female X

Fig. 5.5.2 Source: Tave, D; (1986)

Egg

Sperm

SPB 2N

Shock

2N 2N

4N

TETRAPLOIDY

Fig. 5.6.1 Source: Tave, D; (1986)