Abstract
Breeding red tilapia is one of the solutions to produce the best tillers based on their growth. The strains used are Cangkringan, Janti, Sukabumi, and Sukamandi. Each strain was spawned to produce 16 crosses, both inbreeding and outbreeding. This study aims to determine the results of crosses that have the best growth based on survival rate, growth, and feed conversion ratio. This research lasted for 90 days from 1 September 2022 to 30 March 2023 at the Aquaculture Technology Development Center DIY, Cangkringan, Sleman. Spawning was done by hybridization. The study was conducted in a completely randomized design using a 1×1 meter pond. Feed is given 2 times a day with a 10% biomass ratio. This study was conducted by two nurseries. Observation of the weight and length of individuals was carried out by sampling, as well as water quality every two weeks. Survival rate, growth, and feed conversion ratio data were analyzed by analysis of variance and tested by Tukey’s Multiple Comparison Test. Water qualities were tested descriptively. The results obtained: survival rate ranged from 73-98%, specific weight 1.35-6.451%, and feed conversion ratio 1.11-1.68. From the results of the research, it can be concluded that the Janti-Sukamandi cross breeding has the best quality for the first nursery and the Cangkringan-Sukabumi cross breeding has the best quality for the second nursery. The water quality meets the requirements for cultivating red tilapia.
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