Abstract
The water level in the cultivation of eel (Anguilla bicolor bicolor) is an important study in order to provide the optimal water level for cultivation. Optimizing the water level will affect the substitution of respiration energy with energy to grow. In addition, the water level information is related to the efficiency of water use for eel production in the future. Information on water level for eel production is still very limited, so this research is necessary to do. A total of 120 eel elver (initial weight 13.66 ± 0.09 g) were collected from eel companies in Bogor City, Indonesia. Fish were reared in vertical aquaculture systems with a stocking density of 10 fish per container for 60 days. The artificial feed containing 55% protein given as much as 3–5% of the biomass. Absorption and water replacement were done 20% per day. The result of this research showed that fish weight increased with an average of 33.45 ± 0.33 g. Different water levels had an impact to KKb, SGOT, ALP, and He. There was erosion of the skin epidermis and necrosis of the gill filaments due to the adaptation process. Water quality was within the optimum range for all treatments and 1.5 cm water level is recommended for maintenance (SGOT, ALP and He values were closest to normal values).
Highlights
The water level in the cultivation of eel (Anguilla bicolor bicolor) is an important study in order to provide the optimal water level for cultivation
This study aims to evaluate the effect of water level on the maintenance of eel elver A. bicolor bicolor with vertical aquaculture system (VAS) on physiological conditions and production performance
This study shows better results than the previous studies about the use of water volume of culture media, individual growth rate, and biomass of the eel A. bicolor bicolor stadia elver reared for seventy days at a water volume of 0.4 m3 resulting in SR values of 97.98–98.54%, WSGR 0.72%, and FCR 1–1.7222
Summary
The water level in the cultivation of eel (Anguilla bicolor bicolor) is an important study in order to provide the optimal water level for cultivation. Cultivation process, if the dissolved oxygen in the rearing container < 1 mg L−1, the eels will swim to the surface of the water, the position of the body is in direct contact with free air and the head is hidden out of the water with the gill cavities that swell to resemble a vertical p ipe[18,19] This swimming behavior will last a long time and cause the fish to run out of energy which can lead to death so that specific information is needed regarding the optimal water level for eel cultivation. This study aims to evaluate the effect of water level on the maintenance of eel elver A. bicolor bicolor with vertical aquaculture system (VAS) on physiological conditions and production performance
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