Rather than benefiting wild fish, industrial aquaculture may contribute to declines in ocean fisheries and ecosystems. Farm salmon are commonly infected with salmon lice (Lepeophtheirus salmonis), which are native ectoparasitic copepods. We show that recurrent louse infestations of wild juvenile pink salmon (Oncorhynchus gorbuscha), all associated with salmon farms, have depressed wild pink sal...

Atlantic salmon Salmo salar are extensively farmed throughout their natural range, and unintentional interactions between farmed fish and wild populations have been implicated in the decline of wild salmon. The trace element composition of salmon scales distinguishes wild from farmed fish, and potentially provides a rapid and cheap method to assess the extent of escaped farmed fish within a wil...

The consequence of early thermal experience for subsequent growth patterns was investigated in Atlantic salmon (Salmo salar L.). Spring- and autumn-running salmon were caught in upland (Baddoch) and lowland (Sheeoch) tributaries of the River Dee, Aberdeenshire, Scotland, respectively, on the final stages of their spawning migrations. The eggs were incubated at the simulated natural temperature ...

Anthropogenic activities are greatly altering the habitats of animals, whereby fish are already encountering several stressors simultaneously. The purpose of the current study was to investigate the capacity of fish to respond to two different environmental stressors (high temperature and overnight hypoxia) separately and together. We found that acclimation to increased temperature (from 7.7±0....

Low productivity in aquatic ecosystems is associated with reduced individual growth of fish and increased concentrations of methylmercury (MeHg) in fish and their prey. However, many stream-dwelling fish species can use terrestrially-derived food resources, potentially subsidizing growth at low-productivity sites, and, because terrestrial resources have lower MeHg concentrations than aquatic re...

Heart and skeletal muscle inflammation (HSMI) and cardiomyopathy syndrome (CMS) are putative viral cardiac diseases of Atlantic salmon. This study examined the levels and correlated the serum enzymes creatine kinase (CK) and lactate dehydrogenase (LDH) to the histopathology of clinical outbreaks of HSMI and chronic CMS in farmed Atlantic salmon. A total of 75 fish from 3 different HSMI outbreak...

To find out the significance of the newest member of the natriuretic peptide family, salmon cardiac peptide (sCP), we have determined the distribution of the peptide and its mRNA as well as the tissue and plasma molecular forms in several teleosts. Using probes based on the salmon sCP cDNA in Northern blot analysis we found mRNA homologous to that of sCP to be present in the heart of 15 fish sp...

The epidemiology of Aeromonas salmonicida subsp. salmonicida in the marine environment was investigated. Nutrient resuscitation and infectivity studies did not support a previous claim of dormancy in A. salmonicida and validated the use of colony-forming units (cfu) in survival studies. Survival of A. salmonicida in seawater was assessed and found to be of short duration «10 days). Survival of ...

Rivinoja, P. 2005. Migration Problems of Atlantic Salmon (Salmo salar L.) in Flow Regulated Rivers. Doctor’s dissertation. ISSS: 1652-6880. ISBN: 91-576-6913-9. Migration patterns of adult Atlantic salmon (Salmo salar) and smolts of salmon and brown trout (Salmo trutta) were studied in the flow controlled areas of two northern Swedish rivers. Fish behaviour and migration success at passages of ...

The susceptibility of Atlantic cod (Gadus morhua) and Atlantic Halibut (Hippoglossus hippoglossus) to an Atlantic salmon (Salmo salar) pathogenic isolate of infectious salmon anaemia was investigated. No mortality or clinical signs of infectious salmon anaemia disease were recorded in either species following experimental challenge via intra-peritoneal (i.p.) injection or cohabitation with i.p....