Acronym NA
Category
Aquaculture
Title Nedsatt tarmhelse og forekomst av flytefaeces hos laks - Impaired intestinal health and incidence of floating faeces in salmon Programme National Programme
Instrument (FP6)
Contact Type (FP7)
Strand (Interreg)
NA
Theme (FP7)
Activity Area (FP6)
Regional Area (Interreg)
Action (COST)
NA
Specific Programme (FP7)
NA
Funding source National Coordinator Laila Brunvold Coordinator email laila@havforsk.com
Coordinator institution
NA
Institutions involved
NA - BioMar (Norway) ,
NA - EWOS Innovation AS (Norway) ,
NVI - Norwegian Veterinary Institute (Norway) ,
NA - Skretting Global (Norway) ,
Start year 2011 End year 2013 Funding (€) € 101,045 Website https://www.fhf.no/prosjekter/prosjektbasen/900722/ Summary Two generations (G10 and G11) of Atlantic salmon (Salmo salar) were monitored through a year at sea. Regular sampling was conducted;every three weeks during the summer months and every six weeks during the winter. The samplings were performed with focus on intestinal changes recorded through a scoring form , with registration of both tissue changes related to the gastrointestinal tract and consistency of feces in the intestines. The aim was to identify the prevalence of floating feces , which is feces consisting of ndigested fat. We also wanted to investigate possible links between floating feces and environmental conditions , or whether pathogens were involved. The feed was composed as a representative for a commercial diet, and was produced for the entire experimental period and stored frozen at the station. From the start of the trial to the first sampling there was an increase in floating feces score in the G11 group , and the intestinal scoring revealed a major change in the intestinal tissue in the fish . Similar, in the ame period there was an increase in score of floating feces in the G10 group ,and an increased liver score for both groups. In this period the fish has been exposed to handling, low and decreasing temperatures, and a change i n diet. The histological analysis of various tissue samples from the intestine shows the accumulation of fat in the enterocytes, which correspond to the visual scoring of the gastrointestinal tract . Screening for pathogens in fish from the G11 showed prese ce of PRV in all screened fish. In 5 of 40 examined fish Paranucleospora theridion was also detected. It was not possible to produce a statistically valid material to investigate the occurrence of floating feces related to environment al conditions in this study . Earlier, floating feces were considered to be a problem associated with summer/autumn , but in this study the symptoms were also present in the cold period.
Goal: to map intestinal health and the occurrence of floating faeces in salmon during a season at sea, while monitoring various environmental parameters, lice infestation and disease.
Sub-goal
1. Insight into how the intestinal health status of salmon varies through a year at sea when the feed is standardized during the experimental period.
2, Insight into the relationship between impaired intestinal health and the incidence of floating faeces in relation to environmental stressors.
3, Insight into the relationship between lice infestation and detection of the microsporidia Paranucleospora theridion with the occurrence of floating faeces and impaired intestinal health.
4. Insight into the connection between the detection of other diseases and the occurrence of floating faeces and impaired intestinal health.
Keywords
Disease;
Fish health;
Fish;
Cage aquaculture;
Salmon;
Open sea aquaculture;
Monitoring;
Parasite;
Marine Region
76
Not associated to marine areas
0
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