Production performance and physiology response of Anguilla bicolor bicolor rearing with a wet, damp and dry system

Abstract

<jats:p>Aquaculture is is often constrained by the availability of water, both in quality and quantity. The aim of this study was to determine the optimum maintenance system of elver (Anguilla bicolor bicolor) on a wet, moist and dry system through production performance studies and physiological responses. The research was conducted from August to September 2018 at the Production Technic and Management of Aquaculture Laboratory, Department of Aquaculture, IPB University. A completely randomized design with 5 treatments and 3 replications was used in this study, namely treatment with high water wet system 0% of body height (A), high water wet system 50% of body height (B), high water wet system 100% of body height (C), moist system (D), and dry system (E). The body weight of elver was 18.80 ± 0.62 g which derived from fish cultivator in Bogor, West Java. Fish was fed 3 times per day at satiation with commercial feed which a protein content of 50%. Results showed that treatment C was the best result with survival rate of 100%, the specific growth rate of 0.45% day -1, the absolute growth rate of 0.07 g day 1 and feed conversion ratio of 6.57. The analysis of variance showed that the treatments showed the significant effect (P &lt;0.05). The blood glucose value closest to the eel condition before treatment was found in the treatment C.</jats:p>

The effect of water level in vertical aquaculture systems on production performance, biochemistry, hematology, and histology of Anguilla bicolor bicolor

“…The low water level with a small volume will result in high water use efficiency in producing fish biomass. Eel elver A. bicolor bicolor stadia are able to live and grow at a water level of 1.5 cm or as high as its body, but the results of this study still showed low production performance 20 . The growth of A. bicolor bicolor eel increased with the reduction of water volume 21 , 22 .…”

“…The normal RBCs values are in the range of 1.01–2.43 × 106 cells/mm 3 3 , 10 , 11 , 20 , 68 . Other studies also showed an increase of the RBCs values with 1.59–1.79 × 106 cells/mm 3 and 1.59–1.79 × 106 cells/mm 3 3 , 20 . WBCs have been used in the clinical evaluation of stress and fish disease 71 .…”

“…In general, 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 m 3 resulting in SR values of 97.98–98.54%, WSGR 0.72%, and FCR 1–1.72 22 . Meanwhile, the eel A. bicolor bicolor stadia elver with a size of 20 g/e reared at a water level of 1.5 cm or as high as its body produced SR values of 66.67–100%, WSGR 0.17–0.45%, AGRoB 0.02–0.07 g/day, and FCR 6.57–23.08 20 . The results of this study are also better when compared to the cultivation of A. bicolor bicolor eels in the aquaponic system and phytoremediation using high water volume, the resulting SR value of 78–100%, the growth was 0.3–1.19% and the KP was 1.57–3.91 13 , 37 .…”

“…The values of Hb in this study ranged from 8.45 to 8.93 g%; this shows a normal range for the eels. The normal Hb values in a fish range from 4 to 11 g% 20 , 42 , 68 , 75 . Meanwhile, He is the ratio between RBCs volume and total blood volume 76 .…”

“…Necrosis and hyperplasia also occurred in A. japonica due to the exposure to mercury and infection of Herpesvirus anguillae 82 , 83 . Changes in the histology structure also occur in several vital organs due to diseases and contaminants 20 , 84 – 87 . Erosion on its epidermis occurred because the skin was in direct contact with air continuously and caused the outer part of the skin to fade.…”