Abstract
The purpose of this research was to know the influence of dipping time in natural methyl testosterone hormone (MT) on successful male forming process of tilapia (Oreochromis niloticus) larvae. This research used 360 7 days old tilapia larvae, purchased from cultivation of brackish water, Ujung Batee, Banda Aceh. The samples were divided into 4 treatment groups with three repetitions, they were P0 (control group without treatment), PII (Tilapia larvae were dipped in natural MT for 10 hours), PII (Tilapia larvae were dipped in natural MT for 20 hours), and PIII (Tilapia larvae were dipped in natural MT for 30 hours). All tilapia larvae were maintained until the age of 60 days, before the sex of the fish examined. The average percentage of male tilapia in group P0, PI, PII, and PIII were 50.28, 87.77, 90.06, and 95.05%, respectively. Statistical analysis showed that there were significant differences (P0.05) among P0, PI, PII, and PIII. Based on result of this research, it can be concluded that the longest dipping time the highest the percentage of male tilapia.Key words: larvae, tilapia, natural hormone methyl testosterone, the male sex percentage
Highlights
The purpose of this research was to know the influence of dipping time in natural methyl testosterone hormone
The samples were divided into 4 treatment groups with three repetitions
Tilapia larvae were dipped in natural methyl testosterone hormone (MT) for 10 hours
Summary
Pemberian hormon MT dengan metode perendaman (dipping) lebih efisien karena dosis yang diberikan relatif kecil dan waktu kontaknya lebih singkat walaupun tingkat keberhasilan merubah kelamin jantan di bawah 96% (Zairin, 2002). Namun saat ini penggunaan 17α-MT telah dibatasi karena dapat meninggalkan residu, baik pada ikan maupun di perairan, dan sisanya susah didegradasi (Pandian dan Kirankumar, 2003). Hormon MT alami terbuat dari testis sapi, yang banyak mengandung hormon testosteron sehingga dapat digunakan dalam proses pembentukan kelamin jantan. Hormon yang telah dipatenkan yaitu hormon MT alami yang dibuat dari bahan dasar testis sapi dan tidak mengandung bahan-bahan residu kimia yang dapat membahayakan manusia maupun perairan (Ita, 2012). Perlu dilakukan penelitian lanjutan untuk mencari waktu perendaman yang optimum sehingga menghasilkan persentase pembentukan kelamin jantan yang maksimal
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