สืบค้นงานวิจัย
Nile tilapia reared under full-strength seawater: Hemato-immunological changes and susceptibility to pathogens
Withyachumnarnkul B. - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Nile tilapia reared under full-strength seawater: Hemato-immunological changes and susceptibility to pathogens
ผู้แต่ง / หัวหน้าโครงการ (EN): Withyachumnarnkul B.
บทคัดย่อ (EN): Co-culture of Nile tilapia, Oreochromis niloticus, with marine shrimp has been an increasing farm practice as evidence has suggested that the co-culture is one of a few ways to mitigate shrimp diseases, especially the acute hepatopancreatic necrosis disease that has affected shrimp culture industry worldwide. Since Nile tilapia are basically freshwater species, having them in co-culture with marine shrimp therefore requires a certain degree of salinity adaptation, in which the fish are readily capable to. The present study was aimed at studying certain hemato-immunological changes of the fish reared under elevated salinity, as well as their susceptibility to pathogens. Nile tilapia (180 g initial BW) were reared under gradually increasing salinity within one month from 0 to 30 ppt at 3 ppt/3 d and maintained for another month in 30-ppt salinity. At the end of the 60-day experimental period, 50% of the fish survived with mortality occurred mainly during the second month when the salinity was at 30 ppt. Their growth rate was retarded to 60% of that of the control fish maintained under freshwater (0 ppt). The fish reared under elevated salinity also had significantly lower hematocrit, higher total white blood cell counts, higher absolute numbers of lymphocytes and thrombocytes and higher serum lysozyme activity, compared to those reared under freshwater. Presence of three representative pathogens: infectious spleen and kidney necrosis virus (ISKNV), Francisella noatunensis and Streptococcus agalactiae; were determined in the fish reared under freshwater and in those reared under elevated salinity, using polymerase chain reaction (PCR) method. Of the three pathogens, only ISKNV was detected in 1/10 of the freshwater and 6/10 of the elevated-salinity fish. In both groups, the virus was present in the gills, brain, liver, gonads, skin, kidney and spleen, with moderately and severely positive reaction observed in the kidney and spleen. The detection of ISKNV was confirmed by in situ hybridization of the gonads and kidney, using loop-mediated DNA amplification with digoxigenin, which clearly showed dark-brown stain of the positive signals in the PCR-positive samples. These results suggest that a substantial number of O. niltoicus could survive elevated salinity up to full-strength seawater provided that the salinity had been gradually elevated. And under that situation, changes in hemato-immunological functions of the fish did occur, which probably caused lethal proliferation of pre-existing ISKNV that otherwise would remain dormant. © 2017 Elsevier B.V.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เอกสารแนบ (EN): https://www.scopus.com/inward/record.uri?eid=2-s2.0-85026909918&doi=10.1016%2fj.aquaculture.2017.08.002&partnerID=40&md5=dcb1f821528cf8050c9335f62322bffc
เผยแพร่โดย (EN): มหาวิทยาลัยมหิดล
คำสำคัญ (EN): Salinity tolerance
เจ้าของลิขสิทธิ์ (EN): มหาวิทยาลัยมหิดล
หากไม่พบเอกสารฉบับเต็ม (Full Text) โปรดติดต่อหน่วยงานเจ้าของข้อมูล

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Nile tilapia reared under full-strength seawater: Hemato-immunological changes and susceptibility to pathogens
Withyachumnarnkul B.
มหาวิทยาลัยมหิดล
ไม่ระบุวันที่เผยแพร่
Naturally concurrent infections of bacterial and viral pathogens in disease outbreaks in cultured Nile tilapia (Oreochromis niloticus) farms Effect of plant-extracts on quality changes of refrigerated Nile tilapia Oreochromis niloticus (Linnaeus, 1758) fillets Piper betle leaf extract inhibits multiple aquatic bacterial pathogens and in vivo streptococcus agalactiae infection in nile tilapia Vertical transmission and concurrent infection of multiple bacterial pathogens in naturally infected red tilapia (Oreochromis spp.) Inapparent infection cases of tilapia lake virus (TiLV) in farmed tilapia Francisella noatunensis subsp. orientalis, an emerging bacterial pathogen affecting cultured red tilapia (Oreochromis sp.) in Thailand Aeromonas jandaei and Aeromonas veronii caused disease and mortality in Nile tilapia, Oreochromis niloticus (L.) Epr3 is a conserved immunogenic protein among Aeromonas species and able to induce antibody response in Nile tilapia Viral infections in tilapines: More than just tilapia lake virus Studies on changes in hemato-biochemical and enzymatic profile in postpartum anestrus Murrah buffaloes with hormonal protocols (Buffalo Bulletin (Thailand),35(4))
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