Effect of water temperature of culture medium on the sex ratio and survival rate of fighting fish Betta dennisyongi larvae

Abstract Fighting fish Betta dennisyongi is a popular ornamental freshwater in Indonesia. Male fighting are preferred because the colour pattern and shape of fins more attractive so they expensive. This study aims to determine optimum temperature rearing media water on male sex ratio survival rate larvae. A completely randomized design method with three replications was used this study. The tested was: 26°C, 28°C, 30°C, 32°C. Fish were kept for 40 days. results ANOVA test showed that larval affected significantly female larvae (P<0.05). highest percentage found at 32 °C (93.33%), value different from other treatments. Meanwhile, obtained 28 (80.00%), where Therefore, economic considerations, it concluded optimal °C.