24 พ.ย. 2560

International Journal of Agricultural Technology

13

1015-1022

Association of Agricultural Technology in Southeast Asia (AATSEA)

Zoothamnium sp. is an aquatic protozoan that causes lifeless, defective appendage and immune reduction in the shrimp (Litopenaeus vannamei). Zoothamnium sp. infections causes secondary infection by bacterial, viruses and fungi. This study investigated optimum concentration levels of mangosteen pericarp (peel, rind or hull) extract, effective against Zoothamnium sp. from the L. vannamei. The against test, toxicity test and water quality were conducted at the RBRU labarotory experimental. The most effcetive concentration of mangosteen pericarp extract to treat Zoothamnium sp. was 0.5 g/L, follow by 1.0, 1.5 and 2.0 g/L respectively, which can eliminated all Zoothamnium sp. at 21, 18, 15 and 12 hour, respectively. By consequence, however, the concentration of mangosteen pericarp extract also caused mortality of L. vannamei. From the total 10 individual of L. vannamei from the begin of the experiment. The concentration at 0.5 g/L caused the L. vannamei mortality of 2.33 ± 0.58 (average ± SD) individuals, follow by the concentrations of 1.0, 1.5 and 2.0 g/L, which caused the mortality values of L. vannamei 3.00 ± 0.00, 4.00 ± 1.00 and 4.67 ± 0.58 individuals, respectively. For the concentration of 0.5 g/L, during the experimental period, the average DO, pH and water temperature were beginning at 3.87 mg/L, 9.08 and 27.41°C respectively. At the end of the experiment, the average DO, pH and water temperature were 0.39 mg/L, 7.79 and 28.89 °C, respectively.

http://www.aatsea.org/images/conference_publications/pdf/v13_n7_1_2017_December/4_IJAT_13(7.1)_2017_Daengroj,%20A._Animal%20and%20Fishery%20Sciences.pdf