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Journal of Fish Diseases

Muhammed Duman, Izzet Burcin Saticioglu, J Michael Janda, Soner Altun
The aims of this study were to determine the prevalence and phylogenetic relationship of motile Aeromonas spp. that might be pathogenic species for rainbow trout in infected/mix infection cases (based upon different outbreaks on fish farms). A total of 99 motile Aeromonas isolates (and three reference strains) were analysed that were isolated from four different fish species in different sizes of fish (0.1-3,000 g), different months and water temperatures (6.1-21.2°C). The biochemical characteristics of the isolates were determined using conventional tests and a rapid test kit...
September 21, 2018: Journal of Fish Diseases
Jiwan K Chettri, Azmi Al-Jubury, Inger Dalsgaard, Peter M H Heegaard, Kurt Buchmann
No abstract text is available yet for this article.
September 11, 2018: Journal of Fish Diseases
Seyed Jalil Alavinia, Seyed Saeed Mirzargar, Hooman Rahmati-Holasoo, Hosseinali Ebrahimzadeh Mousavi
The in vitro antiparasitic effect of polyphenol tannic acid (TA) on Ichthyophthirius multifiliis theronts and tomonts was evaluated. In vitro antiparasitic assays revealed that TA in a dose- and time-dependent pattern through the damage of parasite plasma membrane could be 100% effective against I. multifiliis theronts at concentrations of 8 and 11 ppm during all the exposure times (45-270 min). The tomonts proliferation was completely inhibited by penetrating TA (at least 15 ppm for 22-hr exposure) into encysted tomont across the cyst wall...
August 31, 2018: Journal of Fish Diseases
Erika A V Burioli, Katia Varello, Antonio Lavazza, Elena Bozzetta, Marino Prearo, Maryline Houssin
The acute course of disease in young oysters infected by OsHV-1 and the rapid tissue degradation often preclude histological examination of specimens collected during outbreaks in field. Herein, live spat originated from two geographical areas were sampled just at the onset of a mortality event that occurred in Normandy (France) in June 2016. The lesions, associated with high OsHV-1 DNA quantities, were characterized by severe and diffuse haemocytosis mainly involving blast-like cells, myocyte degeneration and large, irregularly shaped degenerate eosinophilic cells in the connective tissue...
August 28, 2018: Journal of Fish Diseases
James McConville, Elena Fringuelli, Derek Evans, Paul Savage
Lough Neagh is home to the largest wild-caught European eel (Anguilla anguilla) commercial fishery in the EU, producing 14% of the EU catch and worth £3.2 million to the local economy. Viral infections have been suggested to play a contributory role in the decline of the worldwide eel stock, but previous studies of the Lough Neagh European eel population had not observed either acute or chronic viral signs. Eel virus European (EVE), Eel virus European X (EVEX) and Anguillid herpesvirus-1 (HVA) have been detected throughout Europe and as the Lough Neagh eel fishery is supplemented by re-stocking of eels from France, Spain and the United Kingdom and these viral infections may be asymptomatic, it is vital that the viral pathogen prevalence in the Lough is accurately determined...
August 24, 2018: Journal of Fish Diseases
Agnieszka Troszok, Ludmiła Kolek, Joanna Szczygieł, Joanna Wawrzeczko, Ewa Borzym, Michał Reichert, Teresa Kamińska, Tomasz Ostrowski, Patrycja Jurecka, Mikołaj Adamek, Krzysztof Rakus, Ilgiz Irnazarow
Cyprinid herpesvirus 3 (CyHV-3), also known as koi herpesvirus (KHV), is an aetiological agent of a virulent and lethal disease in common and koi carp. In this study, we examined in vitro the anti-CyHV-3 activity of acyclovir (ACV), nucleoside analogue commonly used against human herpesviruses, as well as acyclovir monophospate (ACV-MP). The cytotoxicity of the ACV and the ACV-MP for two common carp cell lines, CCB (Common carp brain) and KF1 (Koi carp fin 1), was determined by means of MTT and crystal violet assays...
August 24, 2018: Journal of Fish Diseases
Bo Seong Kim, Ji Won Park, Gyoung Sik Kang, Ji Hye Jin, Heyong Jin Roh, Do Hyung Kim, Mu Kun Lee, Min Do Huh
No abstract text is available yet for this article.
August 21, 2018: Journal of Fish Diseases
Thorbjorg Einarsdottir, Heida Sigurdardottir, Thorunn Soley Bjornsdottir, Elisabet Einarsdottir
Winter ulcer disease, caused by Moritella viscosa, is a significant problem in cold water salmonid farming, although the bacterium can infect and cause disease in a number of other fish species, such as lumpfish (Cyclopterus lumpus). Lumpfish are used as cleaner fish, to eat sea lice from Atlantic salmon (Salmo salar) in sea pens. It remains to be established whether M. viscosa can be transmitted between the fish species. In this study, we examined whether a salmon isolate of M. viscosa could infect and cause disease in lumpfish...
August 21, 2018: Journal of Fish Diseases
Jin Do Kim, Nam-Sil Lee, Jeung Wan Do, Myoung Sug Kim, Han Gill Seo, Miyoung Cho, Sung Hee Jung, Hyun-Ja Han
Mass mortality occurred at an Anguilla japonica eel farm equipped with a recirculating aquaculture system in Gimcheon, Korea, from late spring to early summer 2015. The cumulative 3-month mortality was 16% (approximately 24,300-150,000 fish). The majority of affected fish displayed ulcerative lesions that progressed to petechial haemorrhages and small white granulomas in the major organs. A Gram-positive, acid-fast, nonmotile bacterium was isolated from internal organ lesions. Phylogenetic analysis of 16S rRNA identified the species as Nocardia seriolae and the strain was designated EM150506...
August 17, 2018: Journal of Fish Diseases
Hui Liu, Zhihao Wu, Xiangping Zhu, Zongcheng Song, Jinwei Hu, Lijuan Wang, Jun Li, Feng You
Growth, skeletal structure and muscle composition of cold-shock-induced triploid olive flounder Paralichthys olivaceus were investigated. The average values of total length and total weight of triploids were higher than those of diploids from 5 to 11 months posthatch (mph). The growth difference disappeared after 11 mph. The skeletal structure of flounder at 11 mph was observed by X-ray imaging method. There are four kinds of vertebral deformity including vertebrae fusion, one-sided compression, two-sided compression and vertically shifted...
August 17, 2018: Journal of Fish Diseases
Thuy T N Ngo, Alistair M Senior, Antica Culina, Eduardo S A Santos, Just M Vlak, Mark P Zwart
White spot syndrome virus (WSSV) is an important cause of mortality and economic losses in shrimp farming. Although WSSV-induced mortality is virus dose dependent and WSSV infection does not necessarily lead to mortality, the relationships between virus-particle dose, infection and mortality have not been analysed quantitatively. Here, we explored WSSV dose-response by a combination of experiments, modelling and meta-analysis. We performed dose-response experiments in Penaeus vannamei postlarvae, recorded host mortality and detected WSSV infection...
August 17, 2018: Journal of Fish Diseases
Megan K Schall, Vicki S Blazer, Heather L Walsh, Geoffrey D Smith, Timothy Wertz, Tyler Wagner
A myxozoan parasite, Myxobolus inornatus, is one disease agent identified in young of the year (YOY) smallmouth bass in the Susquehanna River Basin, Pennsylvania. We investigated spatial and temporal variability in M. Inornatus prevalence across the Susquehanna River Basin and at several out-of-basin sites. We examined potential land use drivers of M. Inornatus prevalence including agricultural and developed land use. In 1,267 YOY smallmouth bass collected from 32 sites during 2013-2016, M. Inornatus was documented in 43...
August 17, 2018: Journal of Fish Diseases
Andrew J Janik, Douglas F Markle, Jerry R Heidel, Michael L Kent
Shortnose Sucker (Chasimistes brevirostris) and Lost River Sucker (Deltistes luxatus) are endemic to the Upper Klamath Basin of Southern Oregon and Northern California, and their populations are in decline. We used histopathology and external examination of 140 and external examination only of 310 underyearling suckers collected in 2013, 2015 and 2016 to document pathological changes, particularly those relating to parasites. The most severe infection was caused by a Contracaecum sp., infecting the atrium of 8%-33% of Shortnose Suckers...
August 9, 2018: Journal of Fish Diseases
Hannah J Tidbury, Claire L Joiner, Georgina S E Rimmer, Holly V Potter, Nick G H Taylor
Disease poses a major threat to aquaculture and commercial and recreational fisheries globally. Biosecurity measures have been implemented; however, empirical evidence of their efficacy in situ is lacking. Here, we present the results from a study conducted to examine the effectiveness of disinfectant net dips. Samples were collected from disinfectant net dips at 25 recreational fisheries in south-west England and assessed to determine (a) the level of bacterial contamination and (b) the reduction in titre of a target virus (infectious pancreatic necrosis virus, IPNV) following a contact time of 2 and 5 min...
August 9, 2018: Journal of Fish Diseases
Anika Marie Wohlleben, Frederik Franke, Madeleine Hamley, Joachim Kurtz, Jörn Peter Scharsack
Parasitic helminths have evolved strategies to evade their host's immune systems. Particularly, the early time of interactions between helminths and their hosts might be decisive for their infection success. We used the cestode Schistocephalus solidus, and its highly specific second intermediate host, the three-spined stickleback (Gasterosteus aculeatus) to investigate parasite infection and host cellular immune responses starting 1 day postexposure (dpe). We recovered live parasites from stickleback body cavities already 24 hr after exposure...
August 1, 2018: Journal of Fish Diseases
Mikolaj Adamek, Felix Teitge, Verena Jung-Schroers, Max Heling, David Gela, Veronika Piackova, Martin Kocour, Dieter Steinhagen
Koi sleepy disease (KSD) is a disease with increasing importance in global common carp aquaculture. Despite the fact that carp edema virus (CEV) is most likely the causative agent of KSD, the disease often presents itself as multifactorial with several parasites and bacteria species present on gills, skin or in internal organs. Therefore, in this study, we analysed and presented initial results on an interaction of flavobacteria and CEV in the development of clinical KSD in carp suffering from proliferative gill disease...
August 1, 2018: Journal of Fish Diseases
Damiana Ravasi, Sophie De Respinis, Thomas Wahli
The molecular epidemiology of fish pathogen Saprolegnia parasitica is still largely unknown. We developed a multilocus sequence typing scheme based on seven housekeeping genes to characterize 77 S. parasitica strains isolated from different fish host species at different times and from different geographic areas in Switzerland between 2015 and 2017. Ten different diploid sequence types (DSTs) were identified. The majority (52%) of outbreaks in Switzerland seemed to be caused by one genotype, namely DST3, which was recovered from farm-raised and wild-caught fish in all the geographic areas and river basins included in the study...
July 27, 2018: Journal of Fish Diseases
Ma de Jesús Durán-Avelar, Alejandro Vázquez-Reyes, Ana Lourdes González-Mercado, José Francisco Zambrano-Zaragoza, Miriam Fabiola Ayón-Pérez, Juan Manuel Agraz-Cibrián, Jorge Gutiérrez-Franco, Norberto Vibanco-Pérez
Acute hepatopancreatic necrosis disease (AHPND) was first reported in China in 2009 and afterwards in Mexico in 2013. AHPND is caused by Vibrio parahaemolyticus and affects Penaeus monodon and Litopenaeus vannamei shrimp cultures. The bacterium contains the pirA- and pirB-like genes in 69- to 70-Kb plasmids, which encode the toxins that produce the disease. The aim of this study was to determine whether pirA- and pirB-like genes existed in bacterial genera distinct from Vibrio before the first cases of AHPND were documented in Mexico...
July 27, 2018: Journal of Fish Diseases
Neil M Ruane, David Swords, Teresa Morrissey, Michelle Geary, Cathy Hickey, Evelyn M Collins, Fiona Geoghegan, Fiona Swords
The use of cleaner fish as a biological control for sea lice in Atlantic salmon aquaculture has increased in recent years. Wild-caught wrasse are commonly used as cleaner fish in Europe. In Ireland, samples of wrasse from each fishing area are screened for potential pathogens prior to their deployment into sea cages. Salmonid alphavirus was isolated from a pooled sample of ballan wrasse, showing no signs of disease, caught from the NW of Ireland. Partial sequencing of the E2 and nsP3 genes showed that it was closely related to the previously reported SAV subtype 6...
July 27, 2018: Journal of Fish Diseases
Xavier Roca-Geronès, Isabel Montoliu, Carla Godínez-González, Roser Fisa, Shokoofeh Shamsi
The presence of zoonotic Hysterothylacium larvae in fish from Spanish Atlantic and Mediterranean waters, which can cause economic losses for commercial fisheries, has been reported in several studies; however, little is known about species identity in this region. The aim of this study was to identify at species level the Hysterothylacium morphotypes detected in three commonly consumed fish: horse mackerel (Trachurus trachurus), blue whiting (Micromesistius poutassou) and anchovy (Engraulis encrasicolus). Third- and fourth-stage Hysterothylacium larvae, as well as adults obtained from larval in vitro culture, were morphologically and molecularly identified by ITS1/ITS2 rDNA sequencing...
July 26, 2018: Journal of Fish Diseases
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