The Biology and Culture of Tilapias

Table 1. The treatment of tilapia fry with androgens to produce all-male broods (M = methyltestosterone;

E = ethynyltestosterone).

Treatment

Level of food

incorporation Duration

Species Compound (mg/kg) (dl % Males References

Sarotherodon

mossam bicus M

E

S. niloticus M

M

M

E

S. aureus M

E

E

Clemens and Inslee (1968)

Guerrero (1979b)

Jalabert et al. (1974)

Guerrero and Abella (1976)

Tayamen and Shelton (1978)

Tayaman and Shelton (1978)

Guerrero (1975)

Guerrero (1975)

Sanico (1975)

Table 2. The treatment of tilapia fry with estrogens to produce all-female broods.

• Treatment

Level of food

incorporation Duration

Species Compound (mglkg) (d) %Females References

Sarotherodon
mossam bicus ethynylestradiol 50 19 100 Nakamura and
Takahashi (1973)
estrone 200 56 99 Guerrero and
Guerrero (1976)

S. niloticus diethylstilbestrol 100 25 91 Tayamen and
Shelton (1978)

S. aureus ethynylestradiol* 100 4 2 90 Hopkins et al.
(1979)
Jensen and
Shelton (1979)

*With 100 mg/kg methallibure