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The process of hatching eggs is one phase that determines the success of fish farming. High egg hatchability with good egg quality will make good quality larvae production. The problem of production in Tawes fish cultivation is only able to produce as many as 10,000 eggs with a low hatchability of 22%. As an effort to increase the degree of hatching of Tawes fish eggs, which are different treatment levels in each hatchery. This study aims to determine the effect of different density levels on egg development and the degree of hatching of Tawes fish eggs (B.gonionotus), to determine the optimal density for hatching rate of Tawes fish eggs. The research Z.Alfath, F. Basuki, R.A. Nugroho/Jurnal Sains Akuakultul Tropis:4(2020)2:129-138 eISSN:2621-0525 130 was carried out the Freshwater Fish and Aquaculture Work Unit (PBIAT) of Ngrajek, Magelang, Central Java in March-April 2018. The test material used was Tawes fish (B.gonionotus) from spawning at here. This study used an experimental method with a completely randomized design (CRD) consisting of 4 treatments with 3 replications namely, density in 10 liters of water A (10 grains / liter of water), B (20 grains / liter of water), C (30 grains / liter of water), D (40 grains / liter of water). The variables measured included: descriptive egg development observations, hatching time (minutes), hatching rate (HR) and water quality. Hatching rate data were analyzed by variance analysis, if it was influential, Duncan's multiple region test was conducted to determine the differences between treatments to determine the best treatment. The results showed that different levels of density had a significant effect (Fcount> F table) on the test parameters. The fastest result of embryo development was C and D treatment simultaneously, the highest hatching rate was obtained by treatment B, which was 89.83 ± 3.55.

sains akuakultur tropis

PENGARUH TINGKAT KEPADATAN TELUR YANG BERBEDA TERHADAP EMBRIOGENESIS, LAMA WAKTU PENETASAN DAN DERAJAT PENETASAN TELUR IKAN TAWES (Barbonymus gonionotus)