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Journal of Fish Diseases

S Bui, S Dalvin, T Dempster, O F Skulstad, R B Edvardsen, A Wargelius, F Oppedal
Atlantic salmon populations across the world have diverse ecological and evolutionary histories, from wild anadromous or landlocked, to domestication and genetic modification. The natural host behaviours confer protection from infestation by ectoparasitic salmon lice Lepeophtheirus salmonis, yet whether genetic origin results in different behaviours and thus susceptibility to infestation is unknown. In common garden experiments, we tested antiparasite behaviours, susceptibility and retention of salmon lice in wild anadromous, wild landlocked, domesticated and genetically modified domesticated strains...
September 17, 2017: Journal of Fish Diseases
R M Kabuusu, A T Aire, D F Stroup, C N L Macpherson, H W Ferguson
Syncytial hepatitis (SHT) is an emerging viral disease of tilapia characterized by significant morbidity and mortality. This study aimed to establish the production-level risk factors associated with presence and severity of SHT. Production factors were analysed during multiple outbreaks of SHT that occurred between 2011 and 2013 on a single tilapia farm in Ecuador and compared with the year 2010 before the SHT outbreaks. Relative risks, t tests, modified Poisson and forward stepwise linear regression analyses were performed using EPIINFO™...
September 17, 2017: Journal of Fish Diseases
D M Fields, A B Skiftesvik, H I Browman
The salmon louse (Lepeophtheirus salmonis [Krøyer]) is an ectoparasitic copepod that causes disease in farmed Atlantic salmon (Salmo salar) and may play a role in the decline of some wild salmonid populations. Controlling lice infestations is a major cost for the salmon industry; this has stimulated the pursuit of alternative approaches to controlling them. One such approach involves determining, and then disrupting, the sensory cues used by the parasite to find its host. In this context, we examined the behavioural responses of lice copepodids to light flicker-simulating light reflecting from the sides of the salmon host and/or the shadows cast by fish passing overhead-and water-soluble chemicals released from the skin of the salmon...
September 17, 2017: Journal of Fish Diseases
S L Marín, M P González, S T Madariaga, M Mancilla, J Mancilla
Hydrogen peroxide (HP) is used to remove C. rogercresseyi from fish but little is known about its effect on this species. This study determined EC50 and concentration immobilizing 100% of specimens, capacity of parasites exposed to HP to recover and infest fish, and effect on survival into the copepodid stage. EC50 and concentration immobilizing 100% of specimens were estimated by exposing parasites for 20 min to 11 concentrations and evaluating effect at 1 and 24 h post-exposure. Capacity to recover and infest fish, and survival into copepodid were evaluated by exposing parasites and eggs to HP for 20 min...
September 17, 2017: Journal of Fish Diseases
A Mishra, G-H Nam, J-A Gim, H-E Lee, A Jo, D Yoon, S Oh, S Kim, A Kim, D-H Kim, Y C Kim, H D Jeong, H-J Cha, Y H Choi, H-S Kim
Members of the Iridoviridae family have been considered as aetiological agents of iridovirus diseases, causing fish mortalities and economic losses all over the world. Virus identification based on candidate gene sequencing is faster, more accurate and more reliable than other traditional phenotype methodologies. Iridoviridae viruses are covered by a protein shell (capsid) encoded by the important candidate gene, major capsid protein (MCP). In this study, we investigated the potential of the MCP gene for use in the diagnosis and identification of infections caused Megalocytivirus of the Iridoviridae family...
September 15, 2017: Journal of Fish Diseases
C Bailey, H Schmidt-Posthaus, H Segner, T Wahli, N Strepparava
Proliferative kidney disease (PKD) of salmonids caused by Tetracapsuloides bryosalmonae causes high mortalities of wild brown trout (Salmo trutta fario) and farmed rainbow trout (Oncorhynchus mykiss) at elevated water temperatures. Here the aim was to compare the temperature-dependent modulation of T. bryosalmonae in the two salmonid host species, which display different temperature optima. We used a novel experimental set-up in which we exposed brown trout and rainbow trout to an identical quantified low concentration of T...
September 15, 2017: Journal of Fish Diseases
R Carraro, G Dalla Rovere, S Ferraresso, L Carraro, R Franch, A Toffan, F Pascoli, T Patarnello, L Bargelloni
The availability of a rapid and accurate method for the diagnosis of Photobacterium damselae subsp. piscicida (Phdp), able to discriminate its strictly correlated subsp. damselae (Phdd), formally known as Vibrio damsela, is essential for managing fish pasteurellosis outbreaks in farmed fish. A single-step, high-sensitivity real-time PCR assay for simultaneous detection and quantification of P. damselae was designed targeting partial of the sequence of the bamB gene and tested for specificity and sensitivity on laboratory-generated samples as well as on experimentally infected seabream tissue samples...
August 30, 2017: Journal of Fish Diseases
E A V Burioli, K Varello, S Trancart, E Bozzetta, A Gorla, M Prearo, M Houssin
Summer mortality episodes in adult Pacific oysters have been described since the 1950s in various farming areas. Starting in 2012, a recrudescence of mortalities in commercial-sized oysters was first observed in France and then in Italy, with seasonality extension and translation later in the year. Moribund individuals collected during an event in Italy in December 2014 showed yellowish lesions of the mantle and adductor muscle. Histological examination revealed filamentous bacteria associated with necrotic areas...
August 24, 2017: Journal of Fish Diseases
R O Bowater, M M Dennis, D Blyde, B Stone, A C Barnes, J Delamare-Deboutteville, M A Horton, M White, K Condon, R Jones
The aim of this study was to describe two epizootics of high mortalities from infection with Streptococcus agalactiae, occurring in captive rays held in a marine display aquarium in south-east Queensland, Australia, in 2009 and 2010. Five different species of rays were affected, including mangrove whiprays (Himantura granulata), estuary rays (Dasyatis fluviorum), eastern shovelnose rays (Aptychotrema rostrata), white-spotted eagle rays (Aetobatus narinari) and blue-spotted mask rays (Neotrygon kuhlii). This report describes the history of both epizootics including collection, quarantine and husbandry of rays, the disease epizootics, clinico-pathological features of the disease, antimicrobial therapy, autogenous vaccine production, and laboratory studies including clinical and histopathology, bacteriology, PCR, molecular serotyping and sequencing of the bacterium S...
August 24, 2017: Journal of Fish Diseases
M D Baldissera, C F Souza, R C V Santos, B Baldisserotto
Central nervous system (CNS) infections continue to be an important cause of morbidity and mortality, and microbial invasion of the blood-brain barrier (BBB) is considered a prerequisite for CNS infections, which contribute to behavioural abnormalities and disease pathogenesis. Based on this information, the aim of this study was to evaluate whether Pseudomonas aeruginosa causes disruption of the BBB, and to investigate the involvement of cerebral myeloperoxidase (MPO) activity in this process in experimentally infected silver catfish...
August 24, 2017: Journal of Fish Diseases
M Marcos-López, C Ruiz Espinosa, H D Rodger, I O'Connor, E MacCarthy, M A Esteban
No abstract text is available yet for this article.
August 24, 2017: Journal of Fish Diseases
E Kelly, P A J Martin, S Gibson-Kueh, D L Morgan, B C Ebner, J Donaldson, N Buller, D A Crook, S Brooks, A M Davis, M P Hammer, L Foyle, S Hair, A J Lymbery
The bacterium Edwardsiella ictaluri is considered to be one of the most significant pathogens of farmed catfish in the United States of America and has also caused mortalities in farmed and wild fishes in many other parts of the world. E. ictaluri is not believed to be present in wild fish populations in Australia, although it has previously been detected in imported ornamental fishes held in quarantine facilities. In an attempt to confirm freedom from the bacterium in Australian native fishes, we undertook a risk-based survey of wild catfishes from 15 sites across northern Australia...
August 24, 2017: Journal of Fish Diseases
Tuan Thuc Nguyen, Yeonhwa Jin, Jolanta Kiełpińska, Sven M Bergmann, Matthias Lenk, Remigiusz Panicz
The Community Action Plan requests EU member states to implement measures that ensure the recovery of the severely depleted European eel stocks. One of the main threats is posed by Anguillid herpesvirus 1 (AngHV-1) leading to increased mortality in both wild and farmed eels. Following recommendations of the OIE to minimize the risk of obtaining false-negative results, the main aim of the study was to optimize diagnostic methods for AngHV-1 detection using conventional PCR, nested PCR and in situ hybridization assay...
August 24, 2017: Journal of Fish Diseases
V Stejskal, J Matousek, R Sebesta, M Prokesova, T Vanina, P Podhorec
No abstract text is available yet for this article.
August 11, 2017: Journal of Fish Diseases
E J Emmenegger, S Biacchesi, E Mérour, J A Glenn, A D Palmer, M Brémont, G Kurath
Infectious haematopoietic necrosis virus (IHNV) and spring viraemia of carp virus (SVCV) are both rhabdoviruses of fish, listed as notifiable disease agents by the World Organization for Animal Health. Recombinant rhabdoviruses with heterologous gene substitutions have been engineered to study genetic determinants and assess the potential of these recombinant viruses for vaccine development. A recombinant IHNV (rIHNV), containing the full-length genome of a European IHNV strain, was modified by deleting the glycoprotein (G) gene and replacing it with a European SVCV G-gene to make the rIHNV-Gsvcv...
August 11, 2017: Journal of Fish Diseases
F Scholz, N M Ruane, T Morrissey, M Marcos-López, S Mitchell, I O'Connor, L Mirimin, E MacCarthy, H D Rodger
No abstract text is available yet for this article.
August 9, 2017: Journal of Fish Diseases
N Gagné, F LeBlanc
The infectious salmon anaemia virus (ISAV) is an important viral disease of farmed Atlantic salmon that has caused considerable financial losses for salmon farmers around the world, including Atlantic Canada. It is listed as a notifiable disease by the World Organization for Animal Health, and to this day, culling of infected cages or farms remains the current practice in many countries to mitigate the spread of the virus. In Atlantic Canada, ISAV was first detected in 1996 and continues to be detected. While some outbreaks seemed to have arisen from isolated infections of unknown source, others were local clusters resulting from horizontal spread of infection...
August 7, 2017: Journal of Fish Diseases
N K G Salama, A C Dale, V V Ivanov, P F Cook, C C Pert, C M Collins, B Rabe
Sea lice are a constraint on the sustainable growth of Scottish marine salmonid aquaculture. As part of an integrated pest management approach, farms coordinate procedures within spatial units. We present observations of copepodids being at relatively greater density than nauplii in upper waters, which informs the development of surface layer sea lice transmission modelling of Loch Linnhe, Scotland, for informing farm parasite management. A hydrodynamic model is coupled with a biological particle-tracking model, with characteristics of plankton sea lice...
August 7, 2017: Journal of Fish Diseases
C F Huchzermeyer, K D A Huchzermeyer, K W Christison, B M Macey, P A Colly, B M Hang'ombe, M M Songe
We report on the first outbreak of epizootic ulcerative syndrome (EUS) amongst wild fish populations in the Bangweulu swamps, an inland delta, in the north of Zambia during 2014. The area supports a large and diverse fish fauna related to, but distinct from, that of the Zambezi River system where EUS outbreaks have occurred since 2006. A sizeable artisanal fishery, based on extensive fish weirs, is sustained by the annual flooding of the swamps, and observations of the disease outbreak by fishermen were recorded...
July 26, 2017: Journal of Fish Diseases
A G Büyükekiz, S Altun, E F Hansen, I B Satıcıoğlu, M Duman, T Markussen, E Rimstad
Infectious pancreatic necrosis virus (IPNV) is a common pathogen of rainbow trout (Oncorhynchus mykiss) in Turkey. We found that 455 of 1,676 sample pools tested were IPNV positive. Positive samples were found in all geographical regions where sampling was conducted. Sequence and phylogenetic analyses of VP2 from 30 isolates representing all regions showed that the viruses were highly similar in sequence and grouped within Genogroup 5 (serotype Sp-A2). No correlations between sequences, sampling sites or geographical origins were identified...
July 26, 2017: Journal of Fish Diseases
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