Wijayanto, Dian and Agung Nugroho, Ristiawan and Kurohman, Faik and Budi Nursanto, Didik The effect of red onion (Allium cepa L. var. aggregatum) in feed on growth, survival and profit of Asian seabass cultivation in freshwater media. Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society, 15 (5). pp. 2388-2395. ISSN 1844-8143

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Abstract

Fish farming business needs optimization in order to improve farmers’ welfare. Asian seabass
(Lates calcarifer) has been one of the leading commodities in fish farming in brackish and sea water.
Despite being rarely developed, Asian seabass can be cultivated in fresh water. The cultivation of Asian
seabass in fresh water requires feed supplementation to increase fish immunity. Good fish immunity will
reduce fish mortality and increase profits. This study analyzed the effect of red onion (Allium cepa)
addition to fish feed on the growth, survival rate and profitability of Asian seabass reared in fresh water.
The experiment was carried out in 40 days on Asian seabass seeds with an average size of 0.92 (±0.01)
g per fish. The study was designed using a completely randomized design. Fish were reared in fiber tubs
with 0.5 m3 water and 50 fish per tub. In this study, 3 treatments and 2 replications per treatment were
carried out. The treatment of red onion supplementation in feed was 0% (treatment A as control), 2.5%
(treatment B), and 5% (treatment C). Water quality parameters were measured weekly, including pH
level, dissolved oxygen (DO), salinity, and water temperature. The results of this study indicated that the
red onion treatment significantly affected the feed conversion ratio (FCR) and benefit/cost ratio (BCR).
Treatment C showed the best performance on fish growth (absolute growth weight - W, and specific
growth rate - SGR), while treatment B resulted in the best FCR and BCR. Treatments B and C showed
slightly different results in SR. The best red onion concentration was found between 3.617 and 4.164%.

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