PENGARUH EKSTRAK BIJI MAHONI (SWIETENIA MACROPHYLLA KING) SEBAGAI SAPONIN ALAMI PADA DOSIS PEMBERIAN PAKAN YANG BERBEDA TERHADAP PERTUMBUHAN IKAN NILA LARASATI (OREOCHROMIS NILOTICUS) TAHAP PENDEDERAN II SEBAGAI IKAN PENGGANGGU

Abstract

Applying saponin to the aquaculture activity during fishpond preparation, especially fish or shrimp hatchery, was needed to protect against the pest of wild fish that can disturb aquaculture activity. It needed a solution to use natural chemical material to destroy the wild fish without killing the cultivation. Natural pesticide generally was implied as a pesticide made from plants. Some plant that produced pesticide was identified and effectively proved to the pest controller, such as Mahoni(Swietenia spp). This research aims to identify: 1. The effect of Mahoni seeds powder on the growth of Nila fish on a laboratory scale. 2. The precise dose of Mahoni seeds powder to kill Nila fish on a laboratory scale. The experiment was conducted in August 2015 at The Laboratory of the Faculty of Fisheries and Marine Science at the University of Pancasakti Tegal. The experiment materials were Mahoni seed extraction and juvenile Nila Larasati fish (Oreochromis niloticus), size 5 cm. Eighteen aquaria (70 cm x 70 cm x 70 cm) and some physical and chemical parameter measurement tools were also prepared. The experimental design was differentiated into two treatments: A factor was the seeds of the Mahoni feeding dose, and B factor was the pellet feeding dose by three replications in each treatment. The experiment result showed that an increased feeding frequency of Mahoni seeds influenced the change in fish behavior. These two treatments were significantly influenced by the individual growth, daily growth rate, relative growth rate, and the length of the fish. However, the biomass growth rate was not significantly different. The most significant effect on the fish was expressed in a 15% dose of Mahoni seeds, whereas 5 %, 10%, and 15% of Mahoni seeds extraction treatment showed 40 - 80%, 20 - 80%, and 0% survival rate.