Exposure of Red Tilapia (Oreochromis spp.) eggs to 17 α-Methyltestosterone and the sex ratio of the fish offspring
2011
This study evaluated the proportions of sex reversals which occurred after red tilapia (Oreochromis
spp.) eggs were immersed into various solutions of 17 a-Methyltestosterone (0, 800 and 1200 ug/L of
water). Two fertilization stages of the eggs, i.e., reflecting clear or dark colors, were included in this study.
Besides sex proportions, other parameters studied included hatching, fry and fingerling survival, final
weight and length. There were no significant differences between the sex proportions obtained relative
to hormone concentration or egg color (49.59% males from dark eggs and 46.36% males from light eggs
versus the control, which had 55.24% males). In contrast, the percentage of hatching was significantly
higher in dark eggs (60.27% ± 11.52). Survival of fry was higher when born from dark eggs compared
with clear eggs (51.74% ± 27.01 versus 28.97% ± 1.52, respectively). Fingerling survival was not related to
the color of the eggs (59.28% ± 23.73 versus 65.58% ± 9.01 for initially dark and clear eggs, respectively).
However, surviving males were longer and heavier (6.75 cm ± 1.29 and 5.45 g ± 3.09) than females. This
data suggest a possible interaction between hatching, survival, and egg color.
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