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Diseases of Aquatic Organisms

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https://www.readbyqxmd.com/read/29044046/locally-extensive-meningoencephalitis-caused-by-miamiensis-avidus-syn-philasterides-dicentrarchi-in-a-zebra-shark
#1
Wen-Ta Li, Chieh Lo, Chen-Yi Su, Hsuan Kuo, Susanne Je-Han Lin, Hui-Wei Chang, Victor Fei Pang, Chian-Ren Jeng
Scuticociliatosis, caused by ciliated protozoa in the subclass Scuticociliatia of the phylum Ciliophora, can cause fatal disease in teleost fish species. However, information on scuticociliatosis in elasmobranchs is still scarce. In this report, we describe a case of locally extensive meningoencephalitis caused by Miamiensis avidus (syn. Philasterides dicentrarchi) in a 2 yr old captive zebra shark Stegostoma fasciatum. Granulocytic meningoencephalitis was observed through histological assessment. Inflammation was confined to the ventral aspect of the brain with a large number of ciliated protozoa, transforming into non-suppurative meningitis in the lateral aspect, and gradually vanished in the dorsal aspect...
October 18, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/29044045/emergence-of-carp-edema-virus-cev-and-its-significance-to-european-common-carp-and-koi-cyprinus-carpio
#2
REVIEW
K Way, O Haenen, D Stone, M Adamek, S M Bergmann, L Bigarré, N Diserens, M El-Matbouli, M C Gjessing, V Jung-Schroers, E Leguay, M Matras, N J Olesen, V Panzarin, V Piačková, A Toffan, N Vendramin, T Vesel, T Waltzek
Carp edema virus disease (CEVD), also known as koi sleepy disease, is caused by a poxvirus associated with outbreaks of clinical disease in koi and common carp Cyprinus carpio. Originally characterised in Japan in the 1970s, international trade in koi has led to the spread of CEV, although the first recognised outbreak of the disease outside of Japan was not reported until 1996 in the USA. In Europe, the disease was first recognised in 2009 and, as detection and diagnosis have improved, more EU member states have reported CEV associated with disease outbreaks...
October 18, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/29044044/seawater-detection-and-biological-assessments-regarding-transmission-of-the-oyster-parasite-mikrocytos-mackini-using-qpcr
#3
Mark P Polinski, Gary R Meyer, Geoffrey J Lowe, Cathryn L Abbott
Mikrocytos mackini is an intracellular parasite of oysters and causative agent of Denman Island disease in Pacific oysters Crassostrea gigas. Although M. mackini has been investigated for decades, its natural mode of transmission, mechanism for host entry, and environmental stability are largely unknown. We explored these biological characteristics of M. mackini using a recently described quantitative PCR (qPCR) assay. We detected M. mackini in the flow-through tank water of experimentally infected oysters and during disease remission in host tissues following 6 wk of elevated water temperature...
October 18, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/29044043/nutrient-availability-modulates-both-host-and-parasite-life-histories-in-a-snail-trematode-interaction
#4
Gregory J Sandland, Katherine A Josephson
Host nutrient availability can have important life history consequences for hosts and their parasites. The responses of each participant within the association can vary extensively across host-parasite systems. In this paper, we outline the life history responses of the aquatic snail Biomphalaria glabrata and its trematode parasite Echinostoma caproni during host nutrient restriction. The onset of host starvation had rapid and strong effects on snail reproduction, significantly reducing egg output in control snails and eliminating egg production in infected individuals...
October 18, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/29044042/experimental-inoculation-of-oriental-river-prawn-macrobrachium-nipponense-with-white-spot-syndrome-virus-wssv
#5
Caiyuan Zhao, Hongtuo Fu, Shengming Sun, Hui Qiao, Wenyi Zhang, Shubo Jin, Sufei Jiang, Yiwei Xiong, Yongsheng Gong
The oriental river prawn Macrobrachium nipponense is an economically important species that is widely farmed in China. White spot syndrome virus (WSSV) is one of the most devastating pathogens of the cultured shrimp Litopenaeus vannamei, responsible for massive loss of its commercial products worldwide. We investigated the infectivity and pathogenicity of WSSV in adult M. nipponense using standardized conditions for L. vannamei. The median lethal dose of WSSV in adult M. nipponense was 103.84±0.06 copies g-1, which was about 1000-fold higher than in L...
October 18, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/29044041/viral-haemorrhagic-septicaemia-virus-vhsv-id-infections-are-detected-more-consistently-using-syndromic-vs-active-surveillance
#6
Pia Vennerström, Elina Välimäki, Tapani Lyytikäinen, Maria Hautaniemi, Gabriele Vidgren, Perttu Koski, Anna-Maija Virtala
The eradication of viral haemorrhagic septicaemia virus (VHSV Id) from Finnish brackish-water rainbow trout Oncorhynchus mykiss farms located in the restriction zone in the Province of Åland, Baltic Sea, failed several times in the 2000s. The official surveillance programme was often unable to find VHSV-positive populations, leading to the misbelief in the fish farming industry that virus eradication could be achieved. The ability of 3 other surveillance programmes to detect infected fish populations was compared with the official programme...
October 18, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/29044040/epizootiology-of-the-ectoparasitic-protozoans-ichthyobodo-salmonis-and-trichodina-truttae-on-wild-chum-salmon-oncorhynchus-keta
#7
Shinya Mizuno, Shigehiko Urawa, Mahito Miyamoto, Hayato Saneyoshi, Makoto Hatakeyama, Nobuhisa Koide, Hiroshi Ueda
Infestations of the ectoparasitic flagellate Ichthyobodo salmonis and the ciliate Trichodina truttae have caused acute mortalities of hatchery-reared juvenile chum salmon Oncorhynchus keta in Hokkaido, northern Japan. This study examined the epizootiology of I. salmonis and T. truttae on wild chum salmon as a possible infection source of the 2 parasitic protozoans in hatcheries. Infestations by both ectoparasites were detected on freshwater-adapted adult and juvenile chum salmon in all 4 rivers examined. This is the first study of an anadromous Pacific salmonid to report infestation of I...
October 18, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/29044039/myxobolus-arcticus-and-parvicapsula-minibicornis-infections-in-sockeye-salmon-oncorhynchus-nerka-following-downstream-migration-in-british-columbia
#8
A M Mahony, S C Johnson, C M Neville, M E Thiess, S R M Jones
Factors influencing the health of sockeye salmon Oncorhynchus nerka in British Columbia, Canada, are important for fisheries management and conservation. Juvenile salmon originating from the Fraser River were screened for 3 enzootic parasites (Myxobolus arcticus, Parvicapsula minibicornis, Ceratonova shasta) and the bacterium Renibacterium salmoninarum. Fish were collected from the Strait of Georgia in 2010, 2011 and 2012 and genotyped to stock of origin. Trends in infection status were estimated by year, spawning zone and catch area...
October 18, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28930089/rare-occurrence-of-heart-lesions-in-pacific-oysters-crassostrea-gigas-caused-by-an-unknown-bacterial-infection
#9
Gary R Meyer, Geoffrey J Lowe, Susan M Bower
On rare occasions, small cream-coloured cysts have been observed in the heart and pericardial cavity of Pacific oysters Crassostrea gigas from British Columbia, Canada. Histopathology revealed the presence of large colonies of bacteria (up to 800 µm in diameter) causing significant host response and hypertrophy of the heart epithelium. The causative bacteria were characterized as follows: Gram-negative, coccoid to small rod-shaped, typically <1.5 µm in size, cell walls highly endowed with surface fimbriae and division via binary fission...
September 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28930088/comparison-of-pcr-methods-for-the-detection-of-genetic-variants-of-carp-edema-virus
#10
Mikolaj Adamek, Marek Matras, Verena Jung-Schroers, Felix Teitge, Max Heling, Sven M Bergmann, Michal Reichert, Keith Way, David M Stone, Dieter Steinhagen
The infection of common carp and its ornamental variety, koi, with the carp edema virus (CEV) is often associated with the occurrence of a clinical disease called 'koi sleepy disease'. The disease may lead to high mortality in both koi and common carp populations. To prevent further spread of the infection and the disease, a reliable detection method for this virus is required. However, the high genetic variability of the CEV p4a gene used for PCR-based diagnostics could be a serious obstacle for successful and reliable detection of virus infection in field samples...
September 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28930087/detection-of-amphibian-chytrid-fungus-on-waterfowl-integument-in-natural-settings
#11
Shane M Hanlon, Jerad R Henson, Jacob L Kerby
The chytrid fungus Batrachochytrium dendrobatidis (Bd), the causal agent of the amphibian disease chytridiomycosis, has spread at an alarming rate since its discovery. Bd was initially thought to only infect keratinizing epithelial cells in amphibians, a core component of amphibian skin. However, recent studies have detected Bd on the integument of non-amphibian hosts. We conducted a survey of 3 duck species (gadwalls, green-winged teals, and mallards) to determine whether Bd DNA could be found on their feet...
September 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28930086/outbreaks-of-acropora-white-syndrome-and-terpios-sponge-overgrowth-combined-with-coral-mortality-in-palk-bay-southeast-coast-of-india
#12
T Thinesh, G Mathews, K Diraviya Raj, J K P Edward
Acropora white syndrome (AWS) and Terpios sponge overgrowth (TSO) are serious threats to coral communities in various regions; however, information on these 2 lesions in the Indian Ocean is much more limited than in the Indo-Pacific. The present study revealed the impact of these lesions on the Palk Bay reef, India, and covered an area of 7 km2. In total, 1930 colonies were permanently monitored to assess incidences of AWS and TSO and consequent mortality for a period of 1 yr. TSO affected 5 coral genera and caused 20...
September 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28930085/importation-of-cyhv-2-infected-goldfish-into-the-netherlands
#13
Takafumi Ito, Jun Kurita, Olga L M Haenen
Cyprinid herpesvirus 2 (CyHV-2) is known as the causative agent of herpesviral haematopoietic necrosis in goldfish Carassius auratus auratus. However, the virus has also been detected in Prussian carp C. gibelio and crucian carp C. carassius from European and Asian countries. To prevent spread of the causative virus to other areas, investigation of the risk factors of spread of this virus is important. In this study, 8 batches of goldfish imported into the Netherlands by airfreight from Asia and the Middle East were investigated for the presence of the virus...
September 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28930084/high-nervous-necrosis-virus-nnv-diversity-in-wild-wrasse-labridae-in-norway-and-sweden
#14
Kjetil Korsnes, Egil Karlsbakk, Cecilie K Skår, Lisbeth Sælemyr, Are Nylund, Bjørn Olav Kvamme, Stein Mortensen
Wild goldsinny wrasse Ctenolabrus rupestris, corkwing wrasse Symphodus melops and ballan wrasse Labrus bergylta were collected at 8 sampling sites in Sweden and Norway during summer 2014. Brain tissue from 466 wrasses were analyzed for nervous necrosis virus (NNV) infections by real-time RT-PCR, and positive samples were subjected to sequencing and phylogenetic analysis of partial segments of the RNA2 and RNA1 genes. This study shows that NNV is present in wild ballan, corkwing and goldsinny wrasse along the coastline of Sweden and Norway...
September 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28930083/differential-patterns-of-batrachochytrium-dendrobatidis-infection-in-relict-amphibian-populations-following-severe-disease-associated-declines
#15
Steven M Whitfield, Gilbert Alvarado, Juan Abarca, Hector Zumbado, Ibrahim Zuñiga, Mark Wainwright, Jacob Kerby
Global amphibian biodiversity has declined dramatically in the past 4 decades, and many amphibian species have declined to near extinction as a result of emergence of the amphibian chytrid fungus, Batrachochytrium dendrobatidis (Bd). However, persistent or recovering populations of several amphibian species have recently been rediscovered, and such populations may illustrate how amphibian species that are highly susceptible to chytridiomycosis may survive in the presence of Bd. We conducted field surveys for Bd infection in 7 species of Costa Rican amphibians (all species that have declined to near extinction but for which isolated populations persist) to characterize infection profiles in highly Bd-susceptible amphibians post-decline...
September 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28930082/cryptosporidium-spp-and-giardia-sp-in-aquatic-mammals-in-northern-and-northeastern-brazil
#16
João Carlos Borges, Danielle Dos Lima, Edson Moura da Silva, André Lucas de Oliveira Moreira, Miriam Marmontel, Vitor Luz Carvalho, Rodrigo de Amaral, Stella Maris Lazzarini, Leucio Câmara Alves
Cryptosporidium and Giardia are protozoans that can infect humans and wild and domestic animals. Due to the growing importance of diseases caused by protozoan parasites in aquatic species, we aimed to evaluate the frequency of infection by Cryptosporidium spp. and Giardia sp. in aquatic and marine mammals in the northern and northeastern regions of Brazil. We collected 553 fecal samples from 15 species of wild-ranging and captive aquatic mammals in northern and northeastern Brazil. All samples were analyzed by the Kinyoun technique for identification of Cryptosporidium spp...
September 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28930081/exposure-of-harbour-seals-phoca-vitulina-to-brucella-in-declining-populations-across-scotland
#17
Joanna L Kershaw, Emma J Stubberfield, Geoffrey Foster, Andrew Brownlow, Ailsa J Hall, Lorraine L Perrett
Since 2000 there has been a major decline in the abundance of Scottish harbour seals Phoca vitulina. The causes of the decline remain uncertain. The aim of this study was to establish the extent to which the seals in the regions of greatest decline have been exposed to Brucella, a bacterial pathogen that causes reproductive failure in terrestrial mammalian hosts. Tissues from dead seals collected between 1992 and 2013 were cultured for Brucella (n = 150). Serum samples collected from live capture-released seals (n = 343) between 1997 and 2012 were tested for Brucella antibodies using the Rose Bengal plate agglutination test (RBT) and a competitive enzyme-linked immunosorbent assay (cELISA)...
September 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28930080/seroprevalence-of-brucella-antibodies-in-harbor-seals-in-alaska-usa-with-age-regional-and-reproductive-comparisons
#18
A Hoover-Miller, J L Dunn, C L Field, G Blundell, S Atkinson
Populations of harbor seal Phoca vitulina in the Gulf of Alaska have dramatically declined during the past 4 decades. Numbers of seals in Glacier Bay, in southeast Alaska, USA, have also declined despite extensive protection. Causes of the declines and slow recovery are poorly understood. Brucellosis is a zoonotic disease that adversely affects reproduction in many domestic species. We measured the seroprevalence of Brucella antibodies in 554 harbor seals in 3 Alaska locations: Prince William Sound (PWS), Glacier Bay (GB), and Tracy Arm Fords Terror (TAFT) Wilderness Area...
September 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28792422/first-report-of-cutaneous-infiltrative-lipoma-in-goldfish-carassius-auratus
#19
Neeraj Sood, T Raja Swaminathan, Manoj K Yadav, Pravata K Pradhan, Raj Kumar, Naresh Kumar Sood
Goldfish Carassius auratus is the most popular ornamental species, widely present in private and public aquaria. In the present case, 2 goldfish exhibited bilateral, multiple, variably sized, round, pale-white, soft, protruding masses on the body. The microscopic examination of the masses revealed well-differentiated adipocytes infiltrating the subcutaneous skeletal muscle bundles. The histological lesions were consistent with infiltrative lipoma. To our knowledge, this is the first report of cutaneous infiltrative lipoma in goldfish...
August 9, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28792421/mass-mortalities-of-unknown-aetiology-in-pacific-oysters-crassostrea-gigas-in-port-stephens-new-south-wales-australia
#20
Jeffrey Go, Ania T Deutscher, Zoe B Spiers, Kirk Dahle, Peter D Kirkland, Cheryl Jenkins
From January to June 2013 and November to January 2014, mass mortalities were reported in Pacific oysters Crassostrea gigas cultivated in Port Stephens estuary, New South Wales, Australia. In some cases, 100% mortality was reported in both triploid and diploid C. gigas, although native species of oyster cultivated in the same areas remained unaffected. Histological examination of oysters sampled from the time of mortality events revealed consistent but non-specific pathology, involving a diffuse haemocytic infiltrate in the connective tissue surrounding the digestive gland, extending into the mantle in some instances, but no other signs of any infectious aetiological agent...
August 9, 2017: Diseases of Aquatic Organisms
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