Effect of Dosages and Temperatures on Simalungun Red Ginger (Zingiber officinale var. Rubrum) Ethanol Extract Dipping on Masculinization of Zebra Fish (Danio rerio) as a Model Fish

Ornamental fish are known to be easily cultivated in aquarium or pond. Many people prefer male (MF) over female fish (FF) due to their aesthetic value and productivity which lead to better pricing. The aim of this study was to determine the effect of Simalungun Red Ginger (Zingiber officinale var. Rubrum) (SRG) on masculinization. This study used dipping method which was carried out using Simalungun Red Ginger (Zingiber officinale var. Rubrum) (SRG). The temperature treatments used in this study were 28°C and 32°C. For this research, an experimental study with a Completely Randomized Factorial Design (CRFD) method that had two independent variables such as different dosages and temperatures was used. From five dosages (0 mg/L; 5 mg/L; 10 mg/L; 15 mg/L; 20 mg/L) and three temperature treatments (ambient temperature (about 25°C; 28°C; 32°C), it was found that the highest male percentage of primary sexuality (88.33%), secondary sexuality (85%), and highest total testosterone levels (TL) (1.986 ng/L) were at the treatments with the highest dosages and temperature, while for the highest survival rate were at almost in all B treatments (5 mg/L) and b levels (28°C), in which the survival rate was 100%. For all of these results above, the results were significant.