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http://dx.doi.org/10.11626/KJEB.2019.37.2.136

Influence of denitrified biofloc water on the survival rate and physiological characteristics of Pacific white shrimp juveniles, Litopenaeus vannamei  

Kim, Su-Kyoung (West Sea Fisheries Research Institute, National Institute of Fisheries Science)
Jang, Jin Woo (West Sea Fisheries Research Institute, National Institute of Fisheries Science)
Jo, Yong Rok (West Sea Fisheries Research Institute, National Institute of Fisheries Science)
Kim, Jun-Hwan (West Sea Fisheries Research Institute, National Institute of Fisheries Science)
Kim, Su Kyoung (West Sea Fisheries Research Institute, National Institute of Fisheries Science)
Publication Information
Korean Journal of Environmental Biology / v.37, no.2, 2019 , pp. 136-143 More about this Journal
Abstract
This study investigates the effect of denitrified biofloc water on changes in the water quality parameters and the physiological characteristics of shrimps. Biofloc rearing water contains a large number of microorganisms and can rapidly stabilize the water quality and energy saving if reusable due to high water temperatures. Rearing water contain floating bacteria with both aerobic and anaerobic bacteria. Therefore, when the carbon source is added in limited air supply, the anaerobic state is activated and the denitrification process is possible. In this study, the denitrification water had the following properties: ammonia (6.9 mg L-1), nitrite (0.3 mg L-1), nitrate concentration (9.2 mg L-1), high pH (8.42) and alkalinity (590 mg L-1). The experimental group consisted of seawater (SW, control), a mixture of Seawater and denitrified biofloc water (DNW) in the ratio of 3:1, 1:1 and DNW only. All experiments were done in triplicate. As a result, the survival rate never changed even when 100% of the denitrification water was utilized. However, a body fluid analysis showed that creatine and BUN were increased due to index of stress and the tissue damage resulting from the high denitrified water content. Body fluid ions (Na+, K+, and Cl-) significantly decreased as the denitrified water content increased. It was recommended that the denitrification water be mixed with a certain ratio (less than 50%) in the future as it may affect the osmotic pressure control in shrimps.
Keywords
denitrification; biofloc; Litopenaeus vannamei; hemolymph;
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