PENGARUH PEMBERIAN EKSTRAK AKAR TUBA (Derris elliptica) DENGAN DOSIS YANG BERBEDA TERHADAP LAMA WAKTU KEMATIAN IKAN GABUS (Channa striata) SEBAGAI HAMA BUDIDAYA

Snakehead fish (Channa striata) are considered pests that cause significant reductions and financial losses in the production of fish and shrimp farming. To minimize these production losses, an alternative material such as tuba root extract is used as a natural snakehead fish eradicator. This experiment was conducted at the Fisheries Laboratory of Muhammadiyah University of Malang, using tuba root extract (Derris elliptica) to determine its effect on the time of death of snakehead fish at concentrations of 0.01 ml/L, 0.05 ml/L, 0.1 ml/L, 0.5 ml/L, and 1 ml/L with three replications per treatment. The test fish used were snakehead fish sized 9-11 cm, with 20 individuals per treatment and 30 liters of water volume per unit. Parameters observed included the time of death of the snakehead fish, their reactions, fish mortality, and water quality in each treatment unit. Subsequently, the data were analyzed using analysis of variance (ANOVA). The experiment indicated that P1 with a tuba root extract concentration of 0.01 ml/L had the longest average time of snakehead fish death, while P5 with a concentration of 1 ml/L showed the fastest average time of snakehead fish death at Lethal Concentration 50 (LC50). The higher the concentration administered, the faster the rate of death and reaction induced, whereas lower concentrations resulted in slower rates of death and reaction.