Deformities prevalence in farmed ballan wrasse (Labrus bergylta) in relation to hatchery origin and life stage

Cavrois-Rogacki, Thomas; Drábiková, Lucia; Migaud, Hervé; Davie, Andrew

doi:10.1016/j.aquaculture.2020.736212

Cited by 7 publications

(5 citation statements)

References 60 publications

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“…Gill-cover abnormalities have been shown to develop in many different fish species under experimental or commercial hatchery conditions 24 , 27 . The existing literature shows that their development may be induced by suboptimal levels of vitamin A ( S. aurata 14 , Dicentrarchus labrax 40 ), EFA, DHA and vitamin C ( Chanos chanos 41 , 42 ) in the larval diet, as well as by water temperature during the larval rearing phase ( S. aurata 38 ), or an early shift from live feed to compound diet (laboratory fish, Danio rerio 16 ).…”

Section: Discussionmentioning

confidence: 99%

“…Interestingly, some abnormality types may recover to a greater 25 or lesser 26 extent during the on-growing period, through a process that may involve remodeling of the abnormal bones 25 . Skeletal abnormalities may significantly affect the external morphology 27 , 28 , and thus lower the commercial value of fish that are marketed whole. Furthermore, some abnormality types can induce severe mortality 29 , decrease the growth rate or increase the susceptibility of fish to diseases (reviewed by Boglione et al 24 ).…”

Section: Introductionmentioning

confidence: 99%

“…Prestinicola et al 31 examined the variability of skeletal abnormalities in eight gilthead seabream larval populations which were reared in one commercial (six populations) and one research (two populations) hatchery. Recently, Cavrois-Rogacki et al 27 examined the variability of skeletal abnormalities in 12 populations of ballan wrasse ( Labrus bergylta ) that were reared in two commercial hatcheries.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Variability of key-performance-indicators in commercial gilthead seabream hatcheries

Kourkouta

Tsipourlianos²,

Power³

et al. 2022

Sci Rep

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Skeletal abnormalities are one of the most important key-performance-indicators (KPIs) in finfish hatcheries. Coping with the problem of skeletal abnormalities relies on the understanding of the link between the variability in the rearing conditions, and the variability in abnormalities incidence. Here, 74 seabream larval populations, from four commercial hatcheries, were examined for the presence of abnormalities and monitored with respect to the applied conditions. The inward folding of gill-cover and pugheadedness were the most frequent abnormalities present, with a mean (± SD) frequency of 11.3 ± 17.9 and 6.0 ± 7.2%, respectively. Other abnormalities were observed at very low mean rates (≤ 1%). A new abnormality type, ray-resorption syndrome, was also found. The recorded rate of normally inflated swimbladder was 92.3 ± 7.4% and mean survival rate was 25.9 ± 21.0%. Classification tree analysis indicated six rearing variables as potentially important predictors for pugheadedness, six variables for caudal-fin abnormalities and 10 variables for survival rate. Complementary genetic analysis, revealed differentiating genetic diversity and significant genetic distances among participating hatcheries, suggestive of the role of company-specific management of genetic resources in KPIs’ variability. The results are discussed with respect to their potential use in the control of skeletal abnormalities by commercial hatcheries, as well as for benchmarking among different hatcheries.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Variability of key-performance-indicators in commercial gilthead seabream hatcheries

Kourkouta

Tsipourlianos²,

Power³

et al. 2022

Sci Rep

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“…Nonetheless, there are increasing ethical concerns about challenges in production and welfare issues with cleaner fish (Brooker et al ., 2018; Mo & Poppe, 2018; Powell et al ., 2018). Among known welfare challenges for cleaner fish are high mortality (Overton et al ., 2020), prevalence of deformities (Cavrois‐Rogacki et al ., 2021; Fjelldal et al ., 2020) and susceptibility to diseases (Brooker et al ., 2018; Powell et al ., 2018). If continued, future use and research must have increased focus on optimizing hatchery production to produce robust cleaner fish adapted for environmental conditions in salmon cages to ensure high welfare and delousing efficacy.…”

Section: Introductionmentioning

confidence: 99%

Welfare and performance of ballan wrasse (Labrus bergylta) reared at two different temperatures after a preparatory feeding trial with enhanced dietary eicosapentaenoic acid

Kottmann

Berge

Kousoulaki

et al. 2023

Journal of Fish Biology

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Concerns have long been raised about the welfare of ballan wrasse (Labrus bergylta) used for the biological control of sea lice in Atlantic salmon (Salmo salar) aquaculture. This study assessed the effect of increased dietary eicosapentaenoic acid (EPA) levels and initial condition factor (CF) on the subsequent performance and welfare of ballan wrasse farmed in high and low water temperatures. Fish were fed a diet with either commercial or high EPA levels for 3 months at 15°C. Subsequently, fish were tagged with a passive integrated transponder, measured for their CF and divided into two groups consisting of fish from both treatments and reared for 4.5 months at either 15 or 6°C fed a commercial diet. Each fish was categorized as high (≥2.7) or low CF (<2.7) fish based on the calculated average CF of the population. Dietary composition influenced the fatty acid (FA) profile of the stored lipids without affecting the growth or welfare of ballan wrasse. Fish reared at 15°C showed higher growth, more fat and energy reserves and less ash content. Fish reared at 6°C lost weight, using up their body lipids at the end of the temperature trial. Gene expression analyses showed upregulation of the positive growth marker (GHrα) and two genes involved in the synthesis and oxidation of FAs (elovl5, cpt1) and downregulation of the negative growth marker (mstn) in fish reared at 15°C compared to those reared at 6°C. Fish reared at 6°C showed upregulated levels of il‐6 compared to those reared at 15°C, suggesting an enhanced immune reaction in response to low temperature. Fish with high CF showed better survival, growth and performance compared to those with low CF. External welfare scoring showed higher prevalence and severity in emaciation, scale loss and the sum index score (of all measured welfare parameters) in fish reared at 6°C compared to those reared at 15°C and better welfare in fish with high CF compared to those with low CF. Histological examination of the skin showed that fish reared at 6°C had decreased epidermal thickness, a lower overall number of mucous cells in the inner and outer epidermis and a different organization of mucous cells compared to fish reared at 15°C, indicating stress in fish reared at 6°C. Overall, low water temperatures had profound effects on the performance and external and internal welfare parameters of ballan wrasse and can be considered a stressor likely affecting the delousing efficacy. These findings support the seasonal use of different cleaner fish species. High CF, but not increased dietary EPA levels, appeared to help fish cope better with low water temperatures and should thus be assessed and considered before deploying them in salmon cages.

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“…The aetiology of nephrocalcinosis in fish is not known (Klosterhoff et al, 2015), but there is a consensus that the condition is most likely related to the intensive production conditions in aquaculture (Applegate et al, 2016; Béland et al, 2020; Bjerknes et al, 1994; Cavrois‐Rogacki et al, 2021; Gillespie & Evans, 1979; Klosterhoff et al, 2015; Lewisch et al, 2013; Smart et al, 1979).…”

Section: Introductionmentioning

confidence: 99%

Gene expression patterns in Atlantic salmon (Salmo salar) with severe nephrocalcinosis

Klykken

Boissonnot²,

Reed

et al. 2022

Journal of Fish Diseases

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Nephrocalcinosis is a common disorder in farmed Atlantic salmon, but the consequences for the fish physiology are not well understood. We performed a transcriptome study in kidneys of Atlantic salmon (Salmo salar) smolts without and with severe chronic nephrocalcinosis (NC). The study revealed that numerous genes are differentially expressed in fish with NC compared with healthy salmon. The most evident changes in gene expression patterns in the NC group were a massive downregulation of metabolism and energy production, upregulation of signalling pathways important for tissue repair and function maintenance and upregulation of inflammatory responses. Overall, the extensive tissue damage and the gene regulation responses that affect salmon with severe nephrocalcinosis are highly likely to have dramatic consequences on fish survival.

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Deformities prevalence in farmed ballan wrasse (Labrus bergylta) in relation to hatchery origin and life stage

Cited by 7 publications

References 60 publications

Variability of key-performance-indicators in commercial gilthead seabream hatcheries

Variability of key-performance-indicators in commercial gilthead seabream hatcheries

Welfare and performance of ballan wrasse (Labrus bergylta) reared at two different temperatures after a preparatory feeding trial with enhanced dietary eicosapentaenoic acid

Gene expression patterns in Atlantic salmon (Salmo salar) with severe nephrocalcinosis

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