Main Article Content
A field study on the water quality parameters and prevalence of diseases was carried out in four locations in the Mekong Delta, Vietnam. A total number of 960 samples (816 with disease signs and 144 without disease sign) of farmed shrimp were collected over 8 sampling months (2 production cycles). Samples were collected every two weeks and when abnormal behavior from cultured shrimp was observed. Five major groups of gross clinical signs were recorded among diseased shrimp samples. Diseases that appeared through the sampling months were: (1) atrophy and pale-colored hepatopancreas (HP) with the empty or little food in the mid gut; (2) empty/little/discontinued food in the midgut and (3) slow growth, HP atrophy and gut with discontinued food. White feces disease was not found in April but appeared for the rest of sampling months with the highest prevalence in July (39,2%) and the lowest prevalence in September (4,9%). White spot disease appeared from October to December (at the end of when the monsoon season and low temperature).
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
APHA, AWWA & WEF (2012). Standard methods for examination of water and waste water (22nd ed.). APHA publisher. 1496p.
Bartie, K., Oanh, D. T. H., Huys, G., Dickson, C., Cnockaert, M., Swings, J., Phương, N. T., & Teale, A. (2006). Application of Rep-PCR and Pulsed-field gel electrophoresis for typing chloramphenicol resistant bacterial isolates in a molecular epidemiology study of aquaculture sites in the Mekong Delta. Journal of Biotechnology, 4(1), 31-40.
Barrow, G. I., & Feltham, R. K. A. (1993). Cowan and Steel’s manual for the identification of medical bacteria, 3rd Edition. Cambridge University Press, Cambridge. 262 pages.
Boyd, C. E. (1990). Water quality in ponds for aquaculture. Alabama Agricultural Experiment Station. Auburn University, Alabama.
Chakraborti, J., & Bandyopadhyay, P. K. (2010). First record of a parasitic septate gregarines (Apicomplexa: Sporozoea) in the shrimp Peneaus monodon in Sundarbans of West Bengal. Journal of Parasitic Diseases, 34(1), 40–43. https://doi.org/10.1007/s12639-010-0002-7.
Harvell, C. D., Kim, K., Burkholder, J. M., Colwell, R. R., Epstein, P. R., Grimes, J., Hofmann, E. E., Lipp, E., Osterhaus, A. D. M. E., Overstreet, R., Porter, J. W., Smith, G. W., & Vasta, G. R. (1999). Emerging marine diseases - climate links and anthropogenic factors. Science, 285(5433), 1505-1510. https://doi.org./10.1126/science.285.5433.1505.
Lightner, D. V. (1996). A handbook of shrimp pathology and diagnostic procedure for disease of shrimp. World Aquaculture Society, Baton Rouge, LA. pp. 1-72.
Oanh, D. T. H., Phuong, N. T., Preston, N. I. G. E. L., Hodgson, R. A., & Walker, P. J. (2005). Prevalence of white spot syndrome virus (WSSV) and monodon baculovirus (MBV) infection in Penaeus monodon postlarvae in Vietnam. Diseases in Asian Aquaculture V, 395-404.
Oanh, D.T.H, & Phuong, N.T. (2012). Serious diseases in marine shrimp and freshwater prawn farming in the Mekong river delta. Can Tho University Journal of Science, Special issue on Aquaculture and Fisheries: 22c, 106 - 118.
Oanh, D. T. H., Nguyen, T. N., Tran, V. T., & Bondad-Reantaso, M. G. (2018). Identification and characterization of vibrio bacteria isolated from shrimp infected with early mortality syndrome/acute hepatopancreatic necrosis syndrome (EMS/AHPNS) in Vietnam. Asian Fisheries Science, 31S, 283 292. https://doi.org/10.33997/j.afs.2018.31.S1.021.
Oanh, D. T. H., Thuy, N. T. N., & Ut, V. N. (2021). Investigation of parasites in the digestive tract of white leg shrimp (Litopenaeus vannamei) cultured at coastal farms in the Mekong Delta. Can Tho University Journal of Science, Special issue on Aquaculture and Fisheries:13: 79-85. https://doi.org/10.22144/ctu.jen.2021.020.
Tran, L., Numan, L., Redman, R.M., Mohney, L. L., Pantoja, C.R., Fitzsimmons, K., & Lightner, D. V. (2013). Determination of the infectious nature of the agent of early mortality syndrome (EMS) affecting Penaeid shrimp. Diseases of Aquatic Organisms, 105(1), 45–55, https://doi.org/10.3354/dao02621.
Sirikharin, R., Taengchaiyaphum, S., Sritunyalucksana, K., Thitamadee, S., Flegel, T. W., Mavichak, R., & Proespraiwong, P. (2014). A new and improved PCR method for detection of AHPND bacteria. Network of Aquaculture Centre in Asia and the Pacific.