Simon Jones

Simon Jones
Fisheries and Oceans Canada | DFO · Pacific Biological Station

Doctor of Philosophy

About

189
Publications
31,890
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4,448
Citations
Additional affiliations
January 2010 - December 2012
January 2004 - December 2012
University of Victoria
January 2000 - December 2012
Fisheries and Oceans Canada

Publications

Publications (189)
Article
Full-text available
The sole member of the Piscihepevirus genus (family Hepeviridae) is cutthroat trout virus (CTV) but recent metatranscriptomic studies have identified numerous fish hepevirus sequences including CTV-2. In the current study, viruses with sequences resembling both CTV and CTV-2 were isolated from salmonids in eastern and western Canada. Phylogenetic a...
Article
Full-text available
Background: Salmonid rickettsial septicemia is an emergent and geographically widespread disease of marine-farmed salmonids caused by infection with the water-borne bacterium Piscirickettsia salmonis. Very little is known about the route, timing, or magnitude of bacterial shedding from infected fish. Methodology/principal findings: A cohabitatio...
Article
Full-text available
Piscirickettsia salmonis, the aetiological agent of salmonid rickettsial septicaemia (SRS), is a global pathogen of wild and cultured marine salmonids. Here, we describe the development and application of a reproducible, standardized immersion challenge model to induce clinical SRS in juvenile pink (Oncorhynchus gorbuscha), Atlantic (Salmo salar) a...
Article
Full-text available
The opportunistic examination of factors associated with an outbreak of piscirickettsiosis (SRS) is described in Atlantic salmon Salmo salar post‐smolts held in an open netpen or in tanks supplied with raw sea water at a research aquarium in western Canada. During the outbreak, seawater temperature was significantly higher and salinity significantl...
Article
Full-text available
While co‐infections are common in both wild and cultured fish, knowledge of the interactive effects of multiple pathogens on host physiology, gene expression and immune response is limited. To evaluate the impact of co‐infection on host survival, physiology and gene expression, sockeye salmon Oncorhynchus nerka smolts were infected with the salmon...
Article
Kudoa thyrsites is a cosmopolitan myxozoan parasite of marine fish. The infection causes an economically important myoliquefaction in farmed Atlantic salmon in British Columbia, Canada. Laboratory exposure of Atlantic salmon smolts to infectious seawater was used to test the hypothesis that infection with K. thyrsites is more severe in age-matched,...
Technical Report
Full-text available
ICES identification leaflet on Piscirickettsia salmonis and piscirickettsiosis
Technical Report
Full-text available
An ICES identification leaflet describing the fish pathogenic bacterium Tenacibaculum maritimum
Article
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The salmon louse Lepeophtheirus salmonis, a type of sea lice (family Caligidae), is enzootic in marine waters of British Columbia and poses a health risk to both farmed Atlantic Salmon Salmo salar and wild Pacific salmon Oncorhynchus spp. At the adult stage, sea lice infections can often result in severe cutaneous lesions in their salmonid hosts. T...
Conference Paper
Full-text available
Infection with multiple pathogens is a more typical scenario than single pathogen infections, both in farmed and wild populations. Despite this, our understanding of host-pathogen interactions and disease outcomes is primarily based on knowledge gathered from single-pathogen studies and observations from ecological and disease surveillance programs...
Technical Report
Full-text available
Pathology and diseases of fish and shellfish in marine environments of the ICES region
Article
Integrated culture of bivalves at marine finfish farms may help lessen nutrient loading while producing a commercially-valuable crop and increasing the farms' social license to operate. Integrated culture of filter-feeding bivalves at salmon farms may also provide natural mitigation of the occurrence of planktonic sea lice larvae. This study assess...
Article
Planktonic and parasitic sea lice (Lepeophtheirus salmonis and Caligus clemensi) were examined at a commercial Atlantic salmon (Salmo salar) farm near the Broughton Archipelago, British Columbia (BC) from December 2012 through March 2014. Parasitic sea lice were counted on a minimum of 20 fish in three pens per month. Surface seawater salinity rang...
Technical Report
Full-text available
An assessment was conducted to determine the extent of the risk to Fraser River Sockeye Salmon due to the potential transfer of Infectious Hematopoietic Necrosis Virus (IHNV) from Atlantic Salmon farms in the Discovery Islands of British Columbia under current fish health management practices. The risk assessment was conducted in three main steps....
Article
Factors influencing the health of sockeye salmon Oncorhynchus nerka in British Columbia, Canada, are important for fisheries management and conservation. Juvenile salmon originating from the Fraser River were screened for 3 enzootic parasites (Myxobolus arcticus, Parvicapsula minibicornis, Ceratonova shasta) and the bacterium Renibacterium salmonin...
Article
The histozoic myxozoan parasite Kudoa thyrsites causes post-mortem myoliquefaction and is responsible for economic losses to salmon aquaculture in the Pacific Northwest. Despite its importance, little is known about the host-parasite relationship, including the host response to infection. The present work sought to characterize the immune response...
Article
Full-text available
To improve sustainability in the aquaculture industry plant meals are increasingly used to replace fish meal in fish feed. Solvent-extracted soybean meal (SBM) is an attractive protein source for fish feed because of its high protein content, favorable amino acid profile, and low cost. In Atlantic salmon (Salmo salar), SBM at low levels causes soyb...
Article
Full-text available
Background: Microsporidia are highly specialized, parasitic fungi that infect a wide range of eukaryotic hosts from all major taxa. Infections cause a variety of damaging effects on host physiology from increased stress to death. The microsporidian Facilispora margolisi infects the Pacific salmon louse (Lepeophtheirus salmonis oncorhynchi), an eco...
Article
Full-text available
Background Outcomes of infections with the salmon louse Lepeophtheirus salmonis vary considerably among its natural hosts (Salmo, Oncorhynchus spp.). Host-parasite interactions range from weak to strong host responses accompanied by high to low parasite abundances, respectively. Parasite behavioral studies indicate that the louse prefers the host A...
Article
Full-text available
Two new species of Microsporidia were recognized in skeletal muscle of freshwater fishes from Finland. Myosporidium spraguei n. sp. from pike-perch Sander lucioperca occurred as mature spores within sporophorous vesicles (SPVs) within a xenoma. The ovoid spores were 3.8 µm long and 2.4 µm wide, based on transmission electron micrographs (TEM). The...
Article
Full-text available
Background: Salmon lice, Lepeophtheirus salmonis (Copepoda: Caligidae), are highly important ectoparasites of farmed and wild salmonids, and cause multi-million dollar losses to the salmon aquaculture industry annually. Salmon lice display extensive sexual dimorphism in ontogeny, morphology, physiology, behavior, and more. Therefore, the identific...
Technical Report
Full-text available
Workshop to address the NASCO request for advice on possible effects of salmonid aquaculture on wild Atlantic salmon populations in the North Atlantic [WKCULEF], Copenhagen, Denmark, 1–3 March 2016. Chairs: Ian Russell (UK) and Ole Torrissen (Norway). Number of meeting participants: 25 representing six countries: Norway (ten), Ireland (four), UK (S...
Chapter
Finfish, crustaceans and molluscs carry parasites with potential to infect humans and the risk reflects inadequate food preparation. At-risk groups include those living in endemic regions and practicing traditional aquaculture and food production methods and those within the general population exposed because of the increased popularity of seafood,...
Article
Full-text available
The influence of prior infection with Kudoa thyrsites or host size on the susceptibility of Atlantic salmon post-smolts to infection with the parasite was investigated. Exposure to infective K. thyrsites in raw seawater (RSW) was regulated by the use of ultraviolet irradiation (UVSW). Naïve smolts were exposed to RSW for either 38 d (440 degree day...
Article
Full-text available
Context Parasite transmission between captive and wild fish is mediated by spatial, abiotic, biotic, and management factors. More effective population management and conservation strategies can result from multivariable assessments of factors associated with spatial dynamics of parasite spillover. Objective Our study characterised spatial patterns...
Article
Full-text available
A PCR for the specific detection of the salmon brain parasite Myxobolus arcticus (Pugachev and Khokhlov, 1979) was developed using primers designed to amplify a 1363 base pair fragment of the small subunit rDNA. The assay did not amplify DNA from 5 other Myxobolus species or from 7 other myxozoan species belonging to 5 other genera. For juvenile so...
Chapter
Full-text available
We review evidence for population-level impacts of infections for four economically important myxosporean parasites: Myxobolus cerebralis, the cause of salmonid whirling disease (WD); Tetracapsuloides bryosalmonae, the cause of proliferative kidney disease (PKD) of salmonids, Ceratonova (syn. Ceratomyxa) shasta, the cause of enteronecrosis of salmo...
Technical Report
Full-text available
Five species of sea lice (Lepeophtheirus salmonis, L. cuneifer, Caligus elongatus, C. clemensi, C. curtus) are reported from net pen-reared salmonids in Canada. Of these, L. salmonis is the largest and most aggressive species and is the primary focus of management activities and regulations. Sea louse biology is broadly divisible into free-living a...
Technical Report
Full-text available
Sea lice are found on farmed and wild fish on both the west coast and east coast of Canada. The predominant species on both coasts is referred to as Lepeophtheirus salmonis but indications are that the two groups are genetically different. Caligus species are also found on both coasts, these too are different species: Caligus clemensi and C. elonga...
Article
Disease outbreaks with the salmon louse Lepeophtheirus salmonis cause significant economic losses in mariculture operations worldwide. Variable innate immune responses at the louse-attachment site con-tribute to differences in susceptibility among species such that members of Salmo spp. are more susceptible to infection than those of some Oncorhync...
Article
Full-text available
Open marine net pens facilitate virus and sea lice transfer, occasionally leading to infections and outbreaks of disease in farmed salmon. A review of 3 salmon pathogens (infectious salmon anaemia virus [ISAV], salmon alphavirus [SAV] and the salmon louse Lepeophtheirus salmonis) shows that increased risk of exposure to neighbouring farms is invers...
Article
Full-text available
Gyrodactylus corti is a parasite which causes disease and elevated mortality in captive populations of the wolf-eel (Anarrhichthys ocellatus). Exposures to formalin, freshwater or hydrogen peroxide were compared for efficacy against the parasite in two experiments. Sixty minute baths in formalin (150 or 200 mg/L) were found to be the most efficacio...
Article
Full-text available
Salmon lice Lepeophtheirus salmonis are an ecologically and economically important parasite of wild and farmed salmon. In Scotland, Norway and Eastern Canada, L. salmonis have developed resistance to emamectin benzoate, one of the few parasiticides available for salmon lice. Drug resistance mechanisms can be complex, potentially differing among pop...
Article
Full-text available
The impacts of oocyte parasites on the reproductive success of molluscs are largely unknown. In this study, we evaluated the presence of gonad parasites in 6 species of marine bivalve molluscs native to southern Brazil. Cultured bivalves included the mangrove oyster Crassostrea gasar (sometimes called C. brasiliana), the brown mussel Perna perna, t...
Article
Gyrodactylus corti Mizelle and Kritsky, 1967, originally described from captive wolf-eel (Anarrhichthys ocellatus) in California, was rediscovered during an outbreak of gyrodactylosis among captive A. ocellatus at a marine research facility in Vancouver, British Columbia, Canada. The new material is used for a supplemental description of the parasi...
Presentation
Salmon is the largest Canadian mariculture product and projections of annual growth indicate 197 000 t and $1.2 billion revenue will be reached by 2020. In the midst of this growth, industry must minimize potential negative impacts, including the spread of infectious diseases such as sea lice, Lepeophtheirus salmonis, to wild salmon. All species of...
Article
Full-text available
Salmon species vary in susceptibility to infections with the salmon louse (Lepeophtheirus salmonis). Comparing mechanisms underlying responses in susceptible and resistant species is important for estimating impacts of infections on wild salmon, selective breeding of farmed salmon, and expanding our knowledge of fish immune responses to ectoparasit...
Chapter
This book is comprised of 9 chapters focusing on the diseases and disorders of cage cultured finfish. Topics discussed include an overview of cage culture and its importance in the 21st century, infectious diseases of coldwater fish in marine and brackish waters, infectious diseases of coldwater fish in fresh water, non-infectious disorders of cold...
Article
Responses of sockeye salmon Oncorhynchus nerka during infection with Lepeophtheirus salmonis were assessed in controlled laboratory trials. Juvenile salmon were exposed to 100 copepodids fish-1 (Trials 1 and 2) or 300 copepodids fish-1 (Trial 3) at mean weights of approximately 40, 80 and 135 g, respectively. Infections occurred on all salmon in al...