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Journal of Fish Diseases

P Li, Q Yu, F Li, X Qin, D Dong, B Chen, Q Qin
No abstract text is available yet for this article.
May 23, 2018: Journal of Fish Diseases
J Jarungsriapisit, L J Moore, I U Fiksdal, H Bjørgen, A Tangerås, B Köllner, E O Koppang, S Patel
Pancreas disease (PD) caused by salmonid alphavirus (SAV) severely affects salmonid aquaculture during the seawater phase. To characterize immune cells in target tissues for SAV infection, heart, pancreas and pyloric caeca were analysed from two groups of fish adapted to seawater for 2 and 9 weeks. The sections were scored for the relative abundance of cells expressing MHC class II, IgM, CD3, CD8 or neutrophil/granulocyte markers using immuno-histochemical techniques. In general, necrosis of tissue was more severe in fish infected at 2 weeks post-seawater transfer (wpt) compared with those infected at 9 wpt...
May 23, 2018: Journal of Fish Diseases
D S S Valentim, J L Duarte, A E M F M Oliveira, R A S Cruz, J C T Carvalho, C Solans, C P Fernandes, M Tavares-Dias
Monogeneans are ectoparasites that may cause losses in production and productivity in the aquaculture of Colossoma macropomum. Chemotherapeutics used in aquaculture usually have major adverse effects on fish; hence, the use of essential oils has been considered advantageous, but these are not soluble in water. Thus, the use of nanostructures to enhance water solubility of compounds and improve bioactivity may be very promising. This study investigated the antiparasitic activity of nanoemulsion prepared with Copaifera officinalis oleoresin (50, 100, 150, 200 and 300 mg/L), against monogenean parasites from the gills of C...
May 16, 2018: Journal of Fish Diseases
K Frisch, S B Småge, C Vallestad, H Duesund, Ø J Brevik, A Klevan, R H Olsen, S T Sjaatil, D Gauthier, B Brudeseth, A Nylund
Mouthrot, or bacterial stomatitis, is a disease which mainly affects farmed Atlantic salmon, (Salmo salar, L.), smolts recently transferred into salt water in both British Columbia (BC), Canada, and Washington State, USA. It is a significant fish welfare issue which results in economic losses due to mortality and antibiotic treatments. The associated pathogen is Tenacibaculum maritimum, a bacterium which causes significant losses in many species of farmed fish worldwide. This bacterium has not been proven to be the causative agent of mouthrot in BC despite being isolated from affected Atlantic salmon...
May 14, 2018: Journal of Fish Diseases
S Sivakumar, S Vimal, S Abdul Majeed, S Santhosh Kumar, G Taju, N Madan, T Rajkumar, S Thamizhvanan, K V Shamsudheen, V Scaria, S Sivasubbu, A S Sahul Hameed
White spot syndrome virus (WSSV)-infected shrimp samples collected from grow-out ponds located at Nellore, Andhra Pradesh, India, showed WSSV negative and positive by PCR using primer sets specific to ORF119 and VP28 gene of WSSV, respectively. This indicated the deletion of genetic fragments in the genome of WSSV. The WSSV isolate along with lab strain of WSSV was subjected to next-generation sequencing. The sequence analysis revealed a deletion of 13,170 bp at five positions in the genome of WSSV-NS (new strain) relative to WSSV-TH and WSSV-LS (lab strain)...
May 10, 2018: Journal of Fish Diseases
M D Baldissera, C F Souza, P H Doleski, C C Zeppenfeld, S Descovi, A S Da Silva, B Baldisserotto
Several studies have associated the involvement of xanthine oxidase (XO) activity, a source of uric acid and reactive oxygen species (ROS), to pro-oxidative and pro-inflammatory effects during pathological conditions. Considering this, the aim of this study was to evaluate whether upregulation on seric XO activity may be a pathway involved in the oxidative stress in fish exposed to a diet contaminated with aflatoxin B1 (AFB1 ), as well as whether it may be considered a pathway involved in ROS and NOx production...
May 10, 2018: Journal of Fish Diseases
M C Gjessing, D H Christensen, F Manji, S Mohammad, P E Petersen, B Saure, C Skjengen, S C Weli, O B Dale
Gill diseases cause serious losses in farming of Atlantic salmon and the number of agents involved increases. Salmon gill poxvirus (SGPV) and the gill disease in causes where SGPV apparently was the only disease-causing agent were initially characterized. Recently, it was further shown that SGPV can be a common denominator in widely different multifactorial gill diseases. Here, we present the challenge of diagnosing gill disease with SGPV in salmon fry of 0,3-5 grams. Apoptosis of gill lamellar epithelial cells and hemophagocytosis was also observed in fry similar to findings in smolts and grow-out fish...
May 10, 2018: Journal of Fish Diseases
J C García, B R LaFrentz, G C Waldbieser, F S Wong, S F Chang
No abstract text is available yet for this article.
April 26, 2018: Journal of Fish Diseases
A Al-Jubury, C Lu, P W Kania, L von Gersdorff Jørgensen, Y Liu, I de Bruijn, J Raaijmakers, K Buchmann
A bacterial biosurfactant isolated from Pseudomonas (strain H6) has previously been shown to have a lethal effect on the oomycete Saprolegnia diclina infecting fish eggs. The present work demonstrates that the same biosurfactant has a strong in vitro antiparasitic effect on the fish pathogenic ciliate Ichthyophthirius multifiliis. Three life cycle stages (the infective theront stage, the tomont and the tomocyst containing tomites) were all susceptible to the surfactant. Theronts were the most sensitive showing 100% mortality in as low concentrations as 10 and 13 μg/ml within 30 min...
April 19, 2018: Journal of Fish Diseases
J S Ulvestad, J Kumari, T Seternes, H Chi, R A Dalmo
Reactive oxygen species (ROS) production in macrophage-like cells is induced as an antimicrobial defence against invading pathogens. In this study, we have explored how different stimuli and metabolic inhibitors affect the level of respiratory burst in Atlantic salmon (Salmo salar L.) head kidney macrophage-like cells. Cells stimulated in vitro by bacterial lipopolysaccharide (LPS) and ß-glucan showed increased production of ROS compared to unstimulated cells. Both stimulation and costimulation by curdlan (ß-glucan) induced a higher production of ROS compared to stimulation and costimulation by LPS...
March 30, 2018: Journal of Fish Diseases
J S Munday, M R Perrott, J E Symonds, S P Walker, M A Preece, P S Davie
Spinal abnormalities can be detected at harvest in around 40% of farmed Chinook salmon in New Zealand. However, whether these abnormalities are present in smolt is unknown. Radiographs of 3,736 smolt were taken immediately prior to transfer to sea water and evaluated for fusions, compressions, vertical shifts, and lordosis, kyphosis and/or scoliosis (LKS). The survey included smolt from two different chilling strategies that had been graded into slow- or fast-growing fish. Overall, 4.34% of Chinook salmon smolt had at least one spinal abnormality, similar to the rates of reported in Atlantic salmon smolt...
March 30, 2018: Journal of Fish Diseases
H Bjørgen, E O Koppang, G Gunnes, I Hordvik, T Moldal, M Kaldhusdal, O B Dale
An epizootic incidence of intestinal adenocarcinomas was reported in brood fish of Atlantic salmon (Salmo salar L.) in 2009. The condition was associated with a specific diet inducing enteritis and morphological changes. Here, two field trials of fish up to slaughter size were initiated. In Trial 1, two different feed recipes were used. Feed I was predominantly based on marine ingredients, whereas plant ingredients were limited to soy protein concentrate and wheat. Feed II was lower in fishmeal and without soya protein, which was substituted with plant proteins from other sources...
March 23, 2018: Journal of Fish Diseases
Giulia Bedendo, Valentina Panzarin, Andrea Fortin, Gianpiero Zamperin, Tobia Pretto, Alessandra Buratin, Rosita Quartesan, Matteo Sabbion, Cristian Salogni, Francesco Pascoli, Anna Toffan
This study fully describes a severe disease outbreak occurred in 2016 in black bullhead catfish farmed in Italy. Affected fish showed nervous clinical signs as well as emaciations and haemorrhagic petechiae on the skin at the fin bases, abdomen and gills. Viral isolation in cell culture allowed the subsequent identification of a rhabdovirus, tentatively named ictalurid rhabdovirus (IcRV), through electron microscopy, immunofluorescence and whole genome sequencing (WGS). The newly isolated virus, together with 14 additional viral strains stored in our repository and detected during similar mortality episodes in the period 1993-2016, was phylogenetically analysed on the basis of the nucleoprotein and the glycoprotein nucleotide and amino acid sequences...
March 23, 2018: Journal of Fish Diseases
H Rahmati-Holasoo, S Shokrpoor, M Masoudifard, S Davudypoor, M Vaseghi
No abstract text is available yet for this article.
March 23, 2018: Journal of Fish Diseases
T D Nguyen, P B B Crosbie, B F Nowak, A R Bridle
No abstract text is available yet for this article.
March 23, 2018: Journal of Fish Diseases
Qinghua Zhang, Ce Ji, Jianfeng Ren, Qiuyue Zhang, Xuehong Dong, Yao Zu, Liang Jia, Weiming Li
Zebrafish embryo and larva represent a useful in vivo model for identification of host innate immune responses to bacterial infection. Vibrio parahaemolyticus is a typical zoonotic pathogen worldwide that causes acute gastroenteritis in humans and vibriosis in fishes. However, the mechanism of the innate immune response in the zebrafish larvae infected by V. parahaemolyticus has not been clear. We analysed the transcriptomic profile of 3 days post-fertilization (dpf) zebrafish larvae immersed in V. parahaemolyticus 13 (Vp13) strain suspension for 2 hr...
March 23, 2018: Journal of Fish Diseases
V Jung-Schroers, M Adamek, S Harris, H Syakuri, A Jung, I Irnazarow, D Steinhagen
The effect of dietary β-glucan on the bacterial community in the gut of common carp (Cyprinus carpio) was examined after oral application of Aeromonas hydrophila. Carp received either feed supplemented with 1% MacroGard® , a β-1,3/1,6-glucan, or a β-glucan-free diet. Fourteen days after feeding, half of the carp from each group were intubated with 109 colony-forming units (CFU) of a pathogenic strain of A. hydrophila. Gut samples were taken 12 hr to 7 days after application and analysed using microbiological and molecular biological techniques (NGS, RT-PCR-DGGE)...
March 15, 2018: Journal of Fish Diseases
H Rahmati-Holasoo, M Soltani, M Masoudifard, S Shokrpoor, A Taheri Mirghaed, M Ahmadpoor
Abdominal distention occurred at an incidence of 1% (15 from 1500 fish) in the population of 1-year-old bester (Huso huso × Acipenser ruthenus). Computed tomography (CT) images and radiographs showed a soft tissue mass compressed the posterior part of the swim bladder. Ultrasonography showed that the masses had different patterns. Internal examination revealed the abdominal cavities to be filled with large masses which appeared to encompass most of the visceral organs, including the swim bladder. The masses originated from the posterior kidney...
March 15, 2018: Journal of Fish Diseases
T P Loch, M Faisal
Flavobacterial diseases are significant impediments to hatchery-based fishery conservation and aquaculture productivity worldwide. Recent studies revealed a multitude of novel flavobacteria within the reproductive fluids and unfertilized eggs of feral Chinook salmon Oncorhynchus tshawytscha broodstock, some of which were associated with systemic disease. Herein, embryonated eggs/fry from these broodstock were assayed for flavobacteria while in incubator stacks in three hatcheries over 2 years, as was the water entering hatchery incubators...
May 2018: Journal of Fish Diseases
E Laurin, K K Thakur, I A Gardner, P Hick, N J G Moody, M S J Crane, I Ernst
Design and reporting quality of diagnostic accuracy studies (DAS) are important metrics for assessing utility of tests used in animal and human health. Following standards for designing DAS will assist in appropriate test selection for specific testing purposes and minimize the risk of reporting biased sensitivity and specificity estimates. To examine the benefits of recommending standards, design information from published DAS literature was assessed for 10 finfish, seven mollusc, nine crustacean and two amphibian diseases listed in the 2017 OIE Manual of Diagnostic Tests for Aquatic Animals...
May 2018: Journal of Fish Diseases
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