Optimization of Java barb (Barbonymus gonionotus) Egg Hatching by Immersion in Jatropha curcas L. leaf extract

This study aimed to evaluate the effect of Jatropha curcas leaf extract on the hatching rate and survival rate of Java barb (Barbonymus gonionotus) larvae.Fish eggs were subjected to immersion treatments using Jatropha curcas leaf extract at a concentration of 4 g/L.The control group received no extract treatment.The results showed a significant increase in hatching rate and larval survival in the treatment group compared to the control.The hatching rate improved from 64.402.97% in the control to 84.003.16% in the treatment group, while the survival rate increased from 65.821.50% to 85.241.00%.Water quality parameters (temperature, pH, and dissolved oxygen) remained within the optimal range during the 15-day observation period.The presence of tannins and flavonoids in the leaf extract is believed to reduce egg adhesiveness and fungal infections, leading to improved oxygen exchange and overall larval viability.These findings suggest that Jatropha curcas leaf extract can be used as an effective natural agent to enhance the reproductive success of Java barb.