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Spatio-temporal variations in mortality during the seawater production phase of Atlantic salmon (Salmo salar) in Norway
- Source :
- Journal of fish diseasesREFERENCES. 43(4)
- Publication Year :
- 2019
-
Abstract
- In a sustainable production of animals, monitoring and minimizing mortality must be a top priority. Systematic measuring of mortality over time can be used to evaluate the impact of changes in management and production strategies in Norway. To aid understanding of the potential for reducing mortality, we have used data from 2014 to 2018 to investigate the spatio-temporal patterns of mortality, by descriptive analyses and statistical modelling of possible determinants of mortality. The results show large differences in mortality across different production zones and between years. The areas with the highest density of farmed salmon are also the ones with highest mortality. The total cumulated mortality of farmed salmon increased from 32.3 million in 2014 to 35.2 million in 2018, corresponding to 14.3% and 15.8% of the standing stock. An initial higher mortality was observed during the first 3 months after stocking (mean: 1.5% [0.9%-8.6%] mortality/month). This was followed by a period of stability and lower mortality (mean: 0.8% [0.9%-3.1%] mortality/month), until month 10, when mortality started to increase again. The month of first stocking, the year of slaughter, production zone and number of months at sea were all found to be statistically significant determinants for mortality, with p-values < 1e-15.
- Subjects :
- 0301 basic medicine
Norway
Veterinary (miscellaneous)
Salmo salar
04 agricultural and veterinary sciences
Aquaculture
Aquatic Science
Biology
biology.organism_classification
03 medical and health sciences
030104 developmental biology
Animal science
Stocking
Spatio-Temporal Analysis
040102 fisheries
0401 agriculture, forestry, and fisheries
Animals
Seawater
Salmo
Sustainable production
Mortality
Lower mortality
Subjects
Details
- ISSN :
- 13652761
- Volume :
- 43
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- Journal of fish diseasesREFERENCES
- Accession number :
- edsair.doi.dedup.....10ae6c91c31b65b32bdcba56a42d209d