1. Tizar Gusli
2. Muhammad Alif Fauzi
3. Quraisy Zakky
4. Amir Hamidy
5. Bambang Irawan

One of the reptiles that massively exploited and traded for export commodities in Indonesia is the house gecko (Gekko gecko). Uncontrolled exploitation possibly threatened its wild population. Currently, there needs to be more biological information regarding this species. Thus, a biological approach is required to support a sustainable harvesting program, primarily through reproductive biology approaches. This study provided information about the minimum size for mature individuals of both sexes. We measured morphological characters and examined reproductive system of 136 males and 324 females from the legal processing house Gekko gecko. Our results show that males reproduce at a minimum SVL of 134,09 ± 22,89 mm, while females are 121.21 ± 8.85 mm. There is a correlation between SVL and TL in male and female geckos. Significant differences in the length and width of testes were observed between mature and immature geckos (p<0.05). A relationship was found between SVL and the volume of the right and left testes in mature male geckos, but it was not observed in immature geckos. Significant differences in the volume of the right and left testes were also found between mature and immature male geckos (p<0.05). In female geckos, significant differences in follicle length and width were observed between mature and immature individuals (p<0.05). Additionally, differences in oviduct width were found between mature and immature female geckos (p<0.05). There is a correlation between SVL and follicle length in the virgin and Type 1 categories, while a correlation between SVL and follicle width was only found in Type 1 geckos. An asymmetry pattern in follicles was also discovered in female geckos.This finding can contribute to formulate recommendation for sustain harvest-size of Gekko gecko in Indonesia.