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Journal of Fish Diseases

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https://www.readbyqxmd.com/read/29159968/histochemical-and-immunohistochemical-characterization-of-rodlet-cells-in-the-intestine-of-two-teleosts-anguilla-anguilla-and-cyprinus-carpio
#1
G Bosi, J A DePasquale, M Manera, G Castaldelli, L Giari, B Sayyaf Dezfuli
Rodlet cells (RC) are characterized by a distinctive cell cortex and conspicuous inclusions named "rodlets." These cells are particularly abundant and large in size in intestine of eels. Histochemical, immunohistochemical and ultrastructural investigations were carried out on European eel Anguilla anguilla and Common carp Cyprinus carpio from Northern Italy. Eight biotinylated lectins were used to probe for specific carbohydrate residues in deparaffinized, hydrated intestinal sections of eel and carp. Five antibodies were tested on intestinal sections of both fish species: inducible nitric oxide synthase (i-NOS), leu-enkephalin, lysozyme, serotonin and tumour necrosis factor-α...
November 21, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29159959/influence-of-body-condition-on-the-population-dynamics-of-atlantic-salmon-with-consideration-of-the-potential-impact-of-sea-lice
#2
R Susdorf, N K G Salama, D Lusseau
Atlantic salmon Salmo salar is an iconic species of high conservation and economic importance. At sea, individuals typically are subject to sea lice infestation, which can have detrimental effects on their host. Over recent decades, the body condition and marine survival in NE Atlantic stocks have generally decreased, reflected in fewer adults returning to rivers, which is partly attributable to sea lice. We developed a deterministic stage-structured population model to assess condition-mediated population dynamics resulting in changing fecundity, age at sexual maturation and marine survival rate...
November 21, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29159930/molecular-testing-of-adult-pacific-salmon-and-trout-oncorhynchus-spp-for-several-rna-viruses-demonstrates-widespread-distribution-of-piscine-orthoreovirus-in-alaska-and-washington
#3
M K Purcell, R L Powers, J Evered, J Kerwin, T R Meyers, B Stewart, J R Winton
This research was initiated in conjunction with a systematic, multiagency surveillance effort in the United States (U.S.) in response to reported findings of infectious salmon anaemia virus (ISAV) RNA in British Columbia, Canada. In the systematic surveillance study reported in a companion paper, tissues from various salmonids taken from Washington and Alaska were surveyed for ISAV RNA using the U.S.-approved diagnostic method, and samples were released for use in this present study only after testing negative...
November 21, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29159923/sea-trout-adapt-their-migratory-behaviour-in-response-to-high-salmon-lice-concentrations
#4
E Halttunen, K-Ø Gjelland, S Hamel, R-M Serra-Llinares, R Nilsen, P Arechavala-Lopez, J Skarðhamar, I A Johnsen, L Asplin, Ø Karlsen, P-A Bjørn, B Finstad
Sea trout face growth-mortality trade-offs when entering the sea to feed. Salmon lice epizootics resulting from aquaculture have shifted these trade-offs, as salmon lice might both increase mortality and reduce growth of sea trout. We studied mortality and behavioural adaptations of wild sea trout in a large-scale experiment with acoustic telemetry in an aquaculture intensive area that was fallowed (emptied of fish) synchronically biannually, creating large variations in salmon lice concentrations. We tagged 310 wild sea trout during 3 years, and gave half of the individuals a prophylaxis against further salmon lice infestation...
November 21, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29159897/identification-and-characterization-of-two-variants-of-the-hfq-srna-chaperone-in-the-fish-pathogen-piscirickettsia-salmonis
#5
S H Marshall, P Flores-Herrera, F A Henríquez, F A Gómez
Small RNA and chaperone proteins form synergistic duos that play pivotal roles in controlling gene expression in bacteria. This is the case for Hfq, a highly pleiotropic pretranslational modulator of general protein expression, which responds to harsh environmental conditions and influences fitness and virulence in a wide range of pathogenic Enterobacteria. Given this relevancy, we evaluated the presence and potential role of Hfq in the fish pathogen Piscirickettsia salmonis, a Gram-negative bacterium that threatens the sustainability of Chilean salmon production...
November 21, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29159889/a-systematic-surveillance-programme-for-infectious-salmon-anaemia-virus-supports-its-absence-in-the-pacific-northwest-of-the-united-states
#6
L L Gustafson, L H Creekmore, K R Snekvik, J A Ferguson, J V Warg, M Blair, T R Meyers, B Stewart, K I Warheit, J Kerwin, A E Goodwin, L D Rhodes, J E Whaley, M K Purcell, C Bentz, D Shasa, J Bader, J R Winton
In response to reported findings of infectious salmon anaemia virus (ISAV) in British Columbia (BC), Canada, in 2011, U.S. national, state and tribal fisheries managers and fish health specialists developed and implemented a collaborative ISAV surveillance plan for the Pacific Northwest region of the United States. Accordingly, over a 3-1/2-year period, 4,962 salmonids were sampled and successfully tested by real-time reverse-transcription PCR. The sample set included multiple tissues from free-ranging Pacific salmonids from coastal regions of Alaska and Washington and farmed Atlantic salmon (Salmo salar L...
November 21, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29159880/swim-bladder-mycosis-in-pretty-tetra-hemigrammus-pulcher-caused-by-exophiala-pisciphila-and-phaeophleospora-hymenocallidicola-and-experimental-verification-of-pathogenicity
#7
J Řehulka, A Kubátová, V Hubka
Spontaneous invasive and chronic disseminated mycosis affected Hemigrammus pulcher kept in a public aquarium, and infection was manifested by inappetence, exophthalmia, erratic swimming, eroded scales, anaemia of the gills and abdominal distension. Internally, there was a grossly swollen swim bladder with a thickened wall filled with a dark mass. The body cavities contained a clear, light amber fluid and a swollen intestine which was full of a watery fluid containing small gas bubbles. Histopathology revealed a granulomatous inflammatory response with fungal hyphae in the lumen and wall of the swim bladder, hepatopancreas, spleen and kidneys with signs of nephrohydrosis...
November 21, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29159846/horizontal-and-vertical-distribution-of-sea-lice-larvae-lepeophtheirus-salmonis-in-and-around-salmon-farms-in-the-bay-of-fundy-canada
#8
E J Nelson, S M C Robinson, N Feindel, A Sterling, A Byrne, K Pee Ang
The sea louse, Lepeophtheirus salmonis, is parasitic to salmonid species in the Northern Hemisphere and has become a widespread biological and economic problem for the salmon farming industry. A better understanding is needed of their spatial distribution and early life history to disrupt the life cycle of the sea louse. In this study, sea lice larval densities within salmon farms, between salmon farms and reference sites, and at various depths were quantified using both plankton pumps and plankton nets. Farm sites exhibited significantly higher densities than reference sites; however, these densities dropped an order of magnitude at a distance of 100 m from the cages...
November 21, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29159824/the-external-phenotype-skeleton-link-in-post-hatch-farmed-chinook-salmon-oncorhynchus-tshawytscha
#9
A De Clercq, M R Perrott, P S Davie, M A Preece, A Huysseune, P E Witten
Skeletal deformities in farmed fish are a recurrent problem. External malformations are easily recognized, but there is little information on how external malformations relate to malformations of the axial skeleton: the external phenotype-skeleton link. Here, this link is studied in post-hatch to first-feed life stages of Chinook salmon (Oncorhynchus tshawytscha) raised at 4, 8 and 12°C. Specimens were whole-mount-stained for cartilage and bone, and analysed by histology. In all temperature groups, externally normal specimens can have internal malformations, predominantly fused vertebral centra...
November 21, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29159813/an-overview-of-cleaner-fish-use-in-ireland
#10
M Bolton-Warberg
Sea lice infestations represent one of the most significant challenges facing the salmon farming industry, giving rise to lost production, additional costs of treatment and potential negative interactions with wild stocks. At present, cleaner fish, which actively remove lice from salmon, are an effective, biological, long-term option which has been adopted by many countries. In Ireland, several key studies were conducted in the 1990s on the use of wild-caught wrasse (corkwing, goldsinny and rock cook) as cleaner fish in experimental and commercial scale trials...
November 21, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29148593/first-isolation-of-vibrio-tapetis-and-an-atypical-strain-of-aeromonas-salmonicida-from-skin-ulcerations-in-common-dab-limanda-limanda-in-the-north-sea
#11
M Vercauteren, E De Swaef, A Declercq, L Bosseler, S Gulla, S Balboa, J L Romalde, L Devriese, H Polet, F Boyen, K Chiers, A Decostere
Skin ulcerations rank amongst the most prevalent lesions affecting wild common dab (Limanda limanda) with an increase in prevalence of up to 3.5% in the Belgian part of the North Sea. A complex aetiology of these ulcerations is suspected, and many questions remain on the exact factors contributing to these lesions. To construct the aetiological spectrum of skin ulcerations in flatfish, a one-day monitoring campaign was undertaken in the North Sea. Fifteen fish presented with one or more ulcerations on the pigmented and/or non-pigmented side...
November 17, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29148591/statistical-modelling-of-sea-lice-count-data-from-salmon-farms-in-the-faroe-islands
#12
H Gislason
Fiskaaling regularly counts the number of sea lice in the attached development stages (chalimus, mobiles and adult) for the salmon farms in the Faroe Islands. A statistical model of the data is developed. In the model, the sea-lice infection is represented by the chalimus (or mobile) lice developing into adult lice and is used to simulate past and current levels of adult lice-including treatments-as well as to predict the adult sea lice level 1-2 months into the future. Time series of the chalimus and adult lice show cross-correlations that shift in time and grow in size with temperature...
November 17, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29148587/experimental-infection-by-yersinia-ruckeri-o1-biotype-2-induces-brain-lesions-and-neurological-signs-in-rainbow-trout-oncorhynchus-mykiss
#13
H K Strøm, M Ohtani, B Nowak, T S Boutrup, B Jones, M K Raida, A M Bojesen
Pathological manifestations in rainbow trout (Oncorhynchus mykiss) following experimental waterborne infection with Yersinia ruckeri serotype O1 biotype 2 (strain 07111224) were investigated. Rainbow trout were exposed to 8 × 10(7)  CFU/ml of Y. ruckeri by bath for 6 hr, and mortality was then monitored for 22 days post-infection (dpi). Organs were sampled at 3 dpi and also from moribund fish showing signs of severe systemic infection such as bleeding, exophthalmia or erratic swimming behaviour. Y. ruckeri was observed in the meninges and diencephalon of the brain, and lamina propria of olfactory organ at 3 dpi...
November 17, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29148583/study-of-the-hooking-behaviour-of-lepeophtheirus-salmonis-kr%C3%A3-yer-1837-copepodids-on-atlantic-salmon-salmo-salar-l-using-a-novel-in%C3%A2-vivo-test-system
#14
C Delfosse, C Lafont-Lecuelle, H Barthélémy, C Chabaud, E Teruel, C Bienboire-Frosini, P Pageat
The screening of putative semiochemicals involved in the interaction between Lepeophtheirus salmonis copepodid and the Atlantic salmon could be used to develop methods to prevent infestation. A bioassay was designed to evaluate the attractiveness of Atlantic salmon for L. salmonis copepodids by counting the number of hooked parasites. A salmon was bathed in a tank with 60 copepodids during 45 min. The salmon was humanely killed and its body was scrubbed above a plastic bag. The content of the bag was filtered to count the number of hooked parasites...
November 17, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29143962/comparison-of-gene-expression-in-post-smolt-atlantic-salmon-challenged-by-lf-89-like-and-em-90-like-piscirickettsia-salmonis-isolates-reveals-differences-in-the-immune-response-associated-with-pathogenicity
#15
M Rozas-Serri, A Peña, G Arriagada, R Enríquez, L Maldonado
Piscirickettsiosis is the main bacterial disease affecting the Chilean salmon farming industry and is responsible for high economic losses. The aim of this study was to describe and comparatively quantify the immune response of post-smolt Atlantic salmon infected by cohabitation with fish bearing LF-89-like and EM-90-like Piscirickettsia salmonis. The expression of 17 genes related to the immune response was studied in head kidney from cohabitant fish by RT-qPCR. Our results at the transcriptomic level suggest that P...
November 16, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29125189/neoplasia-in-goldlined-seabream-rhabdosargus-sarba-forssk%C3%A3-l-1775
#16
V Singaravel, A Gopalakrishnan, K Raja, M Rajkumar, H W Ferguson
No abstract text is available yet for this article.
November 10, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29125187/first-analysis-by-maldi-tof-ms-technique-of-chryseobacterium-species-relevant-to-aquaculture
#17
M Pérez-Sancho, A I Vela, M Kostrzewa, L Zamora, A Casamayor, L Domínguez, J F Fernández-Garayzábal
No abstract text is available yet for this article.
November 10, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29068065/establishment-of-a-cell-line-from-the-kidney-of-black-carp-and-its-susceptibility-to-spring-viremia-of-carp-virus
#18
T Xue, Y Z Wang, Q H Pan, Q Wang, J F Yuan, T S Chen
In this study, we established and characterized a cell line derived from the kidney of black carp (Mylopharyngodon piceus), which is an important freshwater aquaculture species. The cell line was designated as MPK and subcultured for more than 70 passages in DMEM medium containing 10% fetal bovine serum (FBS) at 28°C. MPK had a modal diploid chromosome number of 48. Moreover, a transient MPK transfection efficiency was up to 18% using a green fluorescent protein plasmid by a modified electroporation. In addition, the MPK cells showed susceptibility to spring viremia of carp virus (SVCV), as demonstrated by the presence of severe cytopathic effects (CPEs) and increased viral RNA...
October 25, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29068063/cyhv-2-transmission-in-traded-goldfish-stocks-in-germany-a-case-study
#19
M Adamek, J Hellmann, V Jung-Schroers, F Teitge, D Steinhagen
No abstract text is available yet for this article.
October 25, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29064113/genetic-parameters-for-resistance-against-flavobacterium-columnare-in-nile-tilapia-oreochromis-niloticus-linnaeus-1758
#20
P Wonmongkol, S Sukhavachana, K Ampolsak, P Srisapoome, T Suwanasopee, S Poompuang
Columnaris disease is a major cause of mortality in tilapia hatcheries and commonly occurs during the summer season in Thailand. One way of reducing the problem is by selective breeding for increased disease resistance. The objective of this study was to estimate quantitative genetic parameters for resistance against columnaris in the Chitralada 4 strain of Nile tilapia. Data from 43 full-sib families (2,580 records) of fry (age = 32 ± 4 days post-hatch) were used in the analyses. Initially, fry were subjected to bath challenge with Flavobacterium columnare (LD50 concentration = 1...
October 24, 2017: Journal of Fish Diseases
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