<![CDATA[Masculinization is an attempt to increase the number of male fish or direct fish to become male. This is because reproduction energy is diverted to somatic growth. Monosex production of males using the hormone metyltestosterone is reported to be most effective using the larval immersion method during the sex differentation or critical period, in which the larval brain is still a biopotential state directing the formation of sexes in morphology, behaviour and function. Immersion is one of the methods used for male sex change apart from oral (feeding) and injection. Soaking the tilapia larval stage at the age of 10 and 14 days with 1,800 ug/LMT for 4 and 8 hours produced 91,6% and 98,3% of males. The study aimed to determine how long soaking of the larvae in the hormone methyltestosterone on the good masculinization of tilapia (Oreocrhomis niloticus) and what percentage of masculinization is in the larvae of tilapia (Oreocrhomis niloticus) using the hormone methyltestosterone through immersion.The result of ANOVA calculation show that the difference in the duration of immersion with the hormone methyltestosterone sygnificantly affect the percentage of the number of male fish produced.]]>
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