Abstract
In Indonesia, the use of such recirculating aquaculture systems (RAS) is rapidly increasing. The purpose of this study was to investigate the growth, blood chemistry, and water quality of snakehead fish (C. striata) maintained in RAS at varied stocking densities. The RAS was established at the Bogor-based Research Institute for Freshwater Aquaculture and Fisheries Extension. The study employed a completely randomized study using 3 various densities: A). 1 individual L-1, B). 3 individual L-1 and c). 6 individuals L-1, each using three replications. The average weight and length of snakehead fish used is 1.50±0.63 g and 6.20±0.94 cm. Growth performances such as survival rate, weight, and length gain, food conversion ratio, specific growth rate, and final biomass were observed during the research. Blood chemistry parameters analyzed were blood glucose, triglycerides, and total protein. The water quality characteristics were evaluated: pH, temperature, dissolved oxygen, total ammonia nitrogen, nitrate, nitrite, and orthophosphate. The analysis indicates that snakehead fish's growth performances and blood chemistry parameters differed considerably (P<0.05) across all density treatments, with 3 individual L-1 showing the best growth performances. The RAS utilized in snakehead fish culture kept the water quality parameters steady throughout the study.
Highlights
Nowadays, aquaculture intensification has become very popular, and it is characterized by high stocking density and the use of artificial feed to feed the fish
Triglycerides, and total protein serum were detected in the blood of snakehead fish. pH, temperature, DO, nitrite, total ammonia nitrogen (TAN), nitrate, and orthophosphate are among the water quality characteristics assessed
At the 5% confidence level, the numbers followed by different letters on the same line suggest a significant difference (Duncan's test)
Summary
Aquaculture intensification has become very popular, and it is characterized by high stocking density and the use of artificial feed to feed the fish. All living things require nitrogen, and fish feed with a high protein content is the primary nitrogen supply for fish farming [1]. Increased use of high protein content in intensive aquaculture will cause higher waste. Higher waste of snakehead fish culture can be a problem if we dispose the waste into the environment and can harm the fish health, can cause the death of the fish. One of the solutions to manage the snakehead fish waste is using Recirculation Aquaculture System (RAS). RAS has existed since the mid-1950s, RAS conserve both water and land, can be located close to the market [4], RAS makes intensive fish production compatible with environmental sustainability [5], and RAS made better in water quality and increase fish production [6]
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