Factors influencing production loss in salmonid farming

Pincinato, Ruth Beatriz Mezzalira; Asche, Frank; Bleie, Hogne; Skrudland, A.; Stormoen, Marit

doi:10.1016/j.aquaculture.2020.736034

Cited by 25 publications

(13 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fish stocked in spring had increased mortality compared with fall‐stocked fish. This is similar to findings from earlier studies (Bang Jensen, Qviller, et al., 2020; Nilsen et al., 2020; Pincinato et al., 2021). Sea temperature at transfer was also significant in the model, indicating an increase in mortality when the temperature rises.…”

Section: Discussionsupporting

confidence: 92%

“…A study by Pincinato et al. (2021) identified smolt‐related mortality (or smolt quality) as important when analysing factors affecting losses in Norwegian aquaculture through a questionnaire‐based survey performed in 2011, based on farm‐level data (Bleie & Skrudland, 2014; Pincinato et al., 2021). They further associated these production losses to differences between hatcheries.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Analysing mortality patterns in salmon farming using daily cage registrations

Persson

Nødtvedt

Aunsmo

et al. 2021

Journal of Fish Diseases

Self Cite

View full text Add to dashboard Cite

This study describes the patterns of mortality and investigates the sources of variation in mortality during the marine phase of commercial salmon farming. The study included daily mortality records from stocking to harvest of 21 million salmon from ten hatcheries in 136 fish‐groups (fish in the same cage from the same hatchery). The fish was stocked in 2017–2018 at 21 marine farms within two Norwegian companies. The sources of variation in mortality were investigated using multilevel linear regression models with ‘fish‐group’ nested within ‘farm’ as a random effect, cross‐classified with ‘hatchery’. In the final model, ‘fish‐group’ was the source of most variation (70%). Furthermore, the mortality categories ‘smolt‐related mortality’, ‘infectious diseases’ and ‘handling and treatment’ were responsible for 10%, 17% and 29% of the total number of dead fish respectively. Overall, the study shows that smolt‐related mortality is one of the major causes of death in the first part of the production, while handling and treatment was the dominating cause of mortality in total. Mortality varied by fish‐group to a large extent. This means that targeted preventive strategies to decrease mortality for individual fish‐groups might be more effective than overall measures at farm or hatchery level.

show abstract

Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Analysing mortality patterns in salmon farming using daily cage registrations

Persson

Nødtvedt

Aunsmo

et al. 2021

Journal of Fish Diseases

Self Cite

View full text Add to dashboard Cite

show abstract

“…Notably, in Pincinato et al. (2021), some of the best performing companies and farms were found in the group with the smallest companies.…”

Section: Discussionmentioning

confidence: 94%

“…Since the data from this study are only from large multi‐farm companies, the results might not be representable for smaller companies. A recent study show that large (>20 locations) companies on average have a lower production loss (Pincinato et al., 2021). This does not necessarily imply that the described delta mortality in this study will be higher for smaller companies.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Estimating cage‐level mortality distributions following different delousing treatments of Atlantic salmon (salmo salar) in Norway

Walde

Jensen

Pettersen

et al. 2021

Journal of Fish Diseases

Self Cite

View full text Add to dashboard Cite

This retrospective descriptive study estimates cage‐level mortality distributions after six immediate delousing methods: thermal, mechanical, hydrogen peroxide, medicinal, freshwater and combination of medicinal treatments. We investigated mortality patterns associated with 4 644 delousing treatment of 1 837 cohorts of farmed Atlantic salmon (Salmo salar) stocked in sea along the Norwegian coast between 2014 and 2017. The mortality is expressed as mortality rates. We found distributions of delta mortality rate within 1, 7 and 14 days after all six delousing treatments, using mortality rate within 7 days before treatments as baseline. The results show that we can expect increased mortality rates after all six delousing methods. The median delta mortality rates after thermal and mechanical delousing are 5.4 and 6.3 times higher than medicinal treatment, respectively, for the 2017 year‐class. There is a reduction in the delta median mortality for thermal and freshwater delousing from 2015 to 2019. There is a wide variability in the mortality rates, in particular for thermal delousing. Our results suggest that the variability in delta mortality for thermal delousing has been reduced from the 2014 to 2017 year‐class, indicating an improvement of the technique. However, a significant increase in the number of thermal treatments from 14 in 2015 to 738 in 2018 probably contributes to the overall increased mortality in Norwegian salmon farming.

show abstract