Acronym NA
Category
Aquaculture
Title Metodikk for kontroll med dosering av løst stoff mot lakselus i oppdrettsmerd - Methodology for control of dosing of loose substance against salmon lice in fish farms 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 Bjorn Bjoru Coordinator email bjorn.bjoru@vetinst.no
Coordinator institution
FHF - Norwegian Seafood Research Fund (Norway)
Institutions involved
NA
Start year 2002 End year 2003 Funding (€) € 157,175 Website https://www.fhf.no/prosjekter/prosjektbasen/553033/ Summary "Today, only synthetic pyrethroids are used for bath treatment against salmon lice. Synthetic pyrethroids are difficult to measure directly. The dosage is calculated based on estimates of treatment volume. It is assumed that the dose does not dilute to non-therapeutic levels during treatment. To avoid dilution of the drug, the cage must be shielded using a complete tarpaulin or skirt. A low dose reduces the effectiveness of the treatment and increases the risk of resistance development in salmon lice. A high dose can have a toxic effect on the fish. We currently have no methods that enable direct control of dosage during the treatment itself. Therefore, quality assurance of the method for bath treatment of fish farming cages is desirable.
Using synthetic DNA as a tracer, methodology has been developed to map concentration differences of lice medication during delousing in cages using skirts and tarpaulins. Quantitative analyses of the spread of bath medication during delousing have been conducted. The analyses were based on simultaneous sampling of water from five sampling points per layer and at multiple depth layers and time points during the treatment period.
The results showed a more uniform and faster distribution of lice medication when using tarpaulins compared to using skirts. Loss of active ingredient out of the cage and dilution downwards in the cage were detected when using skirts. The results indicate that current delousing practices can be improved."
Keywords
Parasite;
Open sea aquaculture;
Cage aquaculture;
Marine Region
13
Northern North Sea (27.IVa)
1
Marine Region Map
