Effect of 17- Alpha- Methyl Testosterone on Cichlid Kaliko (Labeotropheous foellobroni ) Sex Reversal

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Abstract

In this present study, Cichlid Kaliko (Labeotropheous foellobroni) fallowing was exposed
to 17-alpha-methyl testosterone at 2 stages of development including prior to maturity
(larvae) and after puberty (broodstock). The influence of sex hormone on the larvae was also
explored. The first group was the larvae under the four treatments (0, 50,100, 250) mg per kg
of food and hormones that broodstock group also included four treatments (0, 100, 250, 400)
mg per kg food three replicates were performed in a period of 30 days. Hormone was added to
fish food. Results showed that treatments had a significant difference in fish growth, which
correlated with increased amounts of 17 alpha-methyl testosterone. In group I, food with
250mg/kg testerone resulted in an increase in growth indices (i.e.s, SGR=1.4, ADG= 6.5)
with a mortality rate of 48.3 percent. In group II results showed that treatment of G (400mg
testosterone per kg food) produced larvae with maximum growth indices (SGR=0.91, ADG=
3.6) and the least mortality rate of 31 percent Research revealed that 17 alpha methyl
testosterone could have an effect on Calico fish sex changes in both larval and stock stages.
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Iranian Scientific Fisheries Journal
Volume 22, Issue 1 - Serial Number 82
September and October 2013
Pages 27-36

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