Pengaruh Metode Budidaya dan Asal Bibit terhadap Pertumbuhan Gracilaria verrucosa Yang Dibudidayakan Di Tambak Desa Kaliwungu, Kabupaten Brebes

Abstract

Gracilaria verrucosa is one of the seaweeds with good economic value that can be cultivated in ponds. The demand for Gracilaria is increasing as an ingredient for food, beverage, cosmetic, pharmaceutical manufacturing industries. The factors that determine the success of Gracilaria culture: cultivation methods include the seeds quality and source.This study aims to determine the effect of different Gracilaria seeds sources and its culture methods on its growth, to determine the interaction between methods and seed sources. This study aims to determine the effect of different Gracilaria seeds sources and its culture methods on its growth, to determine the interaction between methods and seed sources The research was conducted in October-November 2020 in Kaliwlingi Village, Brebes District, Brebes Regency, Central Java. The experimental used was factorial design with 2 factors: Factor 1: seed sources (A): A1 = Seed from Semarang; A2 = seed from Brebes; A3 seeds from Demak. Factor 2: cultivation method (B): B1 = longline; B2 = off-bottom; B3: broadcast. So there were 9 treatment combinations: A1B1, A2B1, A3B1; A2B1, A2B2, A2B3; A3B1, A3B2, A3B3, each treatment with 3 replications. The data collected include: growth of gracilaria during 60 days. The Specific Growth Rate (SGR) analyzes using ANOVA. The results showed the origin of seedlings and cultivation methods have a very real effect (P<0.05) on SGR Gracilaria. The highest SGR was at treatment A1B1 (Semarang seeds longline method) = 1.84±0.17%/day, and the lowest was treatment A3B3 (Demak seedlings broadcast method) of 0.25±0.13%/day. The water quality measurement results obtained indicate that the water quality at the research location is in a tolerable range for the growth of seaweed. Keywords: Gracilaria, seed source, longline, broadcast, off-bottom.