A systematic surveillance programme for infectious salmon anaemia virus supports its absence in the Pacific Northwest of the United States
Abstract
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...
Source: Journal of Fish Diseases - November 21, 2017 Category: Zoology Authors: 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 Tags: ORIGINAL ARTICLE Source Type: research
An overview of cleaner fish use in Ireland
Abstract
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. More recently, the National University of Ireland...
Source: Journal of Fish Diseases - November 21, 2017 Category: Zoology Authors: M Bolton ‐Warberg Tags: SPECIAL ISSUE Source Type: research
Horizontal and vertical distribution of sea lice larvae (Lepeophtheirus salmonis) in and around salmon farms in the Bay of Fundy, Canada
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. The majority of the larvae captured in the study were nauplii (93%), and densities ranged from 0 to 10 larvae/m3. Free‐swimming sea lice larvae were found to exhibit a diel cycle where nauplii larvae were in deeper waters (10–17 m) during the day and in surface waters ...
Source: Journal of Fish Diseases - November 21, 2017 Category: Zoology Authors: E J Nelson, S M C Robinson, N Feindel, A Sterling, A Byrne, K Pee Ang Tags: SPECIAL ISSUE Source Type: research
Molecular testing of adult Pacific salmon and trout (Oncorhynchus spp.) for several RNA viruses demonstrates widespread distribution of piscine orthoreovirus in Alaska and Washington
Abstract
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. Here, we tested a subset of these samples for ISAV RNA with three additional published molecular assay...
Source: Journal of Fish Diseases - November 21, 2017 Category: Zoology Authors: M K Purcell, R L Powers, J Evered, J Kerwin, T R Meyers, B Stewart, J R Winton Tags: ORIGINAL ARTICLE Source Type: research
Sea trout adapt their migratory behaviour in response to high salmon lice concentrations
Abstract
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 ...
Source: Journal of Fish Diseases - November 21, 2017 Category: Zoology Authors: 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 Tags: SPECIAL ISSUE Source Type: research
Influence of body condition on the population dynamics of Atlantic salmon with consideration of the potential impact of sea lice
Abstract
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. The model is...
Source: Journal of Fish Diseases - November 21, 2017 Category: Zoology Authors: R Susdorf, N K G Salama, D Lusseau Tags: SPECIAL ISSUE Source Type: research
Identification and characterization of two variants of the Hfq ‐sRNA‐chaperone in the fish pathogen Piscirickettsia salmonis
In conclusion, we demonstrate the existence of two different and functional ORF coding for the hfq marker in marine bacteria and a preliminary analysis indicating that these two novel proteins might have relevant roles in the biology and pathogenic potential of P. salmonis. (Source: Journal of Fish Diseases)
Source: Journal of Fish Diseases - November 21, 2017 Category: Zoology Authors: S H Marshall, P Flores ‐Herrera, F A Henríquez, F A Gómez Tags: ORIGINAL ARTICLE Source Type: research
The external phenotype –skeleton link in post‐hatch farmed Chinook salmon (Oncorhynchus tshawytscha)
This study highlights the relationship between external phenotype and axial skeleton and may help to set the framework for the early identification of skeletal malformations on fish farms. (Source: Journal of Fish Diseases)
Source: Journal of Fish Diseases - November 21, 2017 Category: Zoology Authors: A De Clercq, M R Perrott, P S Davie, M A Preece, A Huysseune, P E Witten Tags: ORIGINAL ARTICLE Source Type: research
Histochemical and immunohistochemical characterization of rodlet cells in the intestine of two teleosts, Anguilla anguilla and Cyprinus carpio
Abstract
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‐...
Source: Journal of Fish Diseases - November 21, 2017 Category: Zoology Authors: G Bosi, J A DePasquale, M Manera, G Castaldelli, L Giari, B Sayyaf Dezfuli Tags: ORIGINAL ARTICLE Source Type: research
Study of the hooking behaviour of Lepeophtheirus salmonis (Kr øyer, 1837) copepodids on Atlantic salmon, Salmo salar L., using a novel in vivo test system
Abstract
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. This procedure was tested at different water temperatures and f...
Source: Journal of Fish Diseases - November 17, 2017 Category: Zoology Authors: C Delfosse, C Lafont ‐Lecuelle, H Barthélémy, C Chabaud, E Teruel, C Bienboire‐Frosini, P Pageat Tags: SPECIAL ISSUE Source Type: research
Study of the hooking behaviour of Lepeophtheirus salmonis (Kr øyer, 1837) copepodids on Atlantic salmon, Salmo salar L., using a novel in vivo test system
Journal of Fish Diseases, EarlyView. (Source: Journal of Fish Diseases)
Source: Journal of Fish Diseases - November 17, 2017 Category: Zoology Source Type: research
Statistical modelling of sea lice count data from salmon farms in the Faroe Islands
Journal of Fish Diseases, EarlyView. (Source: Journal of Fish Diseases)
Source: Journal of Fish Diseases - November 17, 2017 Category: Zoology Source Type: research
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Journal of Fish Diseases, Ahead of Print. (Source: Journal of Fish Diseases)
Source: Journal of Fish Diseases - November 17, 2017 Category: Zoology Source Type: research
