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| Registros recuperados: 11 | |
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| Alfonso, Sebastien; Sadoul, Bastien; Gesto, Manuel; Joassard, Lucette; Chatain, Beatrice; Geffroy, Benjamin; Bégout, Marie-laure. |
| Coping styles consist of a coherent set of individual physiological and behavioral differences in stress responses that are consistent across time and context. Such consistent inter-individual differences in behavior have already been shown in European sea bass (Dicentrarchus labrax), but the associated mechanisms are still poorly understood. Here, we combine physiological measurements with individual behavioral responses in order to characterize coping styles in fish. Fish were tagged and placed in a tank for group risk-taking tests (GRT) at 8 months of age to evaluate boldness using the proxy latency of leaving a sheltered area towards an open area. A subsample of these fish were individually challenged 16 months later using an open field test (OFT), in... |
| Tipo: Text |
Palavras-chave: Personality; HPI axis; Gene transcription; Neurotransmitters. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00491/60282/63708.pdf |
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| Gesto, Manuel; Skov, Peter V.; Jokumsen, Alfred. |
| In wild salmonid fish, specific individual behavioral traits have been correlated with the timing of fry emergence from their gravel spawning nests; Early emerging fish display more aggressive behavior and have a higher probability of becoming socially dominant, compared to fish that emerge at a later stage. Apart from aggression and dominance, other behavioral and metabolic traits, such as boldness, metabolic rate, or growth, have also been linked to emergence time. Altogether, the traits of early- and late-emerging fish resemble those of the proactive and reactive stress-coping style, respectively. As proactive fish are considered more resilient to stress, it may be desirable to select these for aquaculture production. However, it is currently unclear to... |
| Tipo: Journal paper |
Palavras-chave: Production systems; Breeding and genetics; Health and welfare; Aquaculture. |
| Ano: 2017 |
URL: http://orgprints.org/31479/1/Gesto%20et%20al.%202017_Emergence%20Time%20and%20Skin%20Melanin_Frontiers%20in%20Neuroscience.pdf |
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| Jokumsen, Alfred; Gesto, Manuel; Buchmann, Kurt; Lorenzen, Niels; Pedersen, Lars-Flemming; Henriksen, Niels Henrik; Schmidt, Jacob; Madsen, Lone; Kania, Per; Pedersen, Per Bovbjerg. |
| Rainbow trout farming and in particular organic rainbow trout farms are critically challenged by the relatively high prevalence of skin/gill infections caused by various pathogens, especially the parasite Costia (Ichthyobodo necator) and amoebae, which are ultimately lethal for fry/smaller fish. In addition, a Midichloria-like bacterium causes the non-lethal skin disease Red Mark Syndrome (RMS), which results in downgrading/rejection of up to 30% of the fish when placed on the market. Treatment by use of antibiotics/parasitics/ auxiliary compounds is only possible to a limited extent in organic trout production. Hence, solutions to prevent and/or treat costia, amoebae and RMS are urgently needed, not only to secure production of organic rainbow trout in... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Production systems; Health and welfare; Aquaculture. |
| Ano: 2019 |
URL: http://orgprints.org/36515/1/Jokumsen_ShelterFish_Poster_.pdf |
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| Jokumsen, Alfred; Gesto, Manuel; Lund, Ivar; Madsen, Lone; Andersen R., Nikolaj; Pedersen, Lars-Flemming; Larsen, Erling P.; Nielsen, Max; Nielsen, Thorkild; Larsen, Villy J.. |
| Formålet med RobustFish projektet var at: • Styrke udviklingen af økologisk ørredproduktion i Danmark men også til gavn for konventionelt opdræt • Undersøge ørredyngels robusthed i forhold til start-fodrings adfærd, fedtsyreindholdet i foderet og følsomhed over for yngeldødeligheds-syndromet (YDS) • Effekt af vandbehandling med hjælpestoffer • Viden om markedsforhold, forbrugerkendskab, produktudvikling og øget afsætning. Robustfish har adresseret ovennævnte problemstillinger, og på grundlag af opnåede resultater kan der drages følgende konklusioner og deraf følgende anbefalinger og perspektiver for styrkelse af det økologiske opdræt af regnbueørred i Danmark. • Yngel med tidlig fødesøgnings adfærd (swim-up) viste tendens til større robusthed... |
| Tipo: Report |
Palavras-chave: Production systems; Feeding and growth; Markets and trade; Health and welfare; Aquaculture. |
| Ano: 2018 |
URL: http://orgprints.org/33577/1/Workshop_Report_Presentations_FINAL.pdf |
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| Gesto, Manuel; Jokumsen, Alfred. |
| In wild salmonid fish, individual behavioural traits have been suggested to be coupled with the timing of fry emergence form gravel spawning nests, in such a way that early emerging fish have shown to be more aggressive and to have a higher probability to become socially dominant than those fish emerging at a later stage. Besides aggression and dominance, other behavioural and metabolic traits such as boldness, metabolic rate or growth had also been coupled to emergence time. Altogether, early- and late-emerging fish have traits resembling those of proactive and reactive stress coping styles, respectively. Proactive fish are considered to be more resilient to stress. However, it is currently unclear if that coupling is maintained in farmed fish... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Health and welfare. |
| Ano: 2016 |
URL: http://orgprints.org/30381/1/MGesto%208ISFE%20Final.pdf |
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| Gesto, Manuel; Liu, Dibo; Pedersen, Lars-Flemming; Meinelt, Thomas; Strauss, David L.; Jokumsen, Alfred. |
| Peracetic acid (PAA) is considered an eco-friendly alternative to other antimicrobial agents of common use in aquaculture. The literature suggests that fish can habituate to PAA exposure based on a reduction of the fish corticosteroid response to PAA administration after repeated exposures. If that is true, PAA would also be a good option from the point of view of fish physiology. However, stronger evidence is needed to confirm that the use of PAA is welfare-friendly to fish. Besides habituation, other hypothetical factors such as desensitization, physiological exhaustion or PAA-mediated endocrine disruption could potentially explain the reduction in the corticosteroid response after repeated/prolonged PAA exposure. In this study, rainbow trout that had... |
| Tipo: Journal paper |
Palavras-chave: Health and welfare. |
| Ano: 2018 |
URL: http://orgprints.org/32935/3/Gesto%20et%20al.%20Con%EF%AC%81rmation%20that%20pulse%20and%20continuous%20peracetic%20acid%20administration%20does%20not%20disrupt%20the%20acute%20stress%20response%20in%20rainbow%20trout_.pdf |
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| Skov, Peter V.; Joao de Jesus Gregersen, Kim; Gesto, Manuel; Jokumsen, Alfred. |
| The timing with which salmonid larvae emerge from their gravel nests is thought to be correlated with a particular suite of behavioural and physiological traits that correspond to the stress coping style of the individual. Among these traits, aggressiveness, dominance and resilience to stress, are potentially interesting to exploit in aquaculture production. In the present study a series of experiments were performed, with the purpose of characterising behavioural, metabolic and production related traits in rainbow trout juveniles from different emergence fractions. Newly hatched rainbow trout were sorted according to their emergence time from an artificial nest. The early, middle, and late fractions were retained and assessed for their physiological... |
| Tipo: Journal paper |
Palavras-chave: Feeding and growth; Health and welfare. |
| Ano: 2019 |
URL: http://orgprints.org/36307/1/Skov%20et%20al%20Comp%20Biochem%20Physiol%20A.pdf |
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| Lazado, Carlo Cabacang; Lund, Ivar; Skov, Peter V.; Jokumsen, Alfred; Gesto, Manuel; Nguyen, Huy Quang; Pedersen, Per Bovbjerg. |
| Circadian rhythms established by the endogenous clocks enable organisms to anticipate periodic and cyclic changes in their environment. This internal time-keeping system is highly conserved amongst animals and provides them with adaptive advantages as biological processes can be scheduled to occur at the most crucial times of the day. Circadian rhythm is emerging as an important regulator of immune functions. However, there is a paucity of information on the influence of this biological phenomenon in the immune mechanisms of teleost fish. A series of studies was conducted to investigate the circadian rhythms of systemic and mucosal innate immunity using model (i.e., zebrafish, Danio rerio) and non-model (i.e., permit, Trachinotus falcatus; rainbow trout,... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Specific methods; Health and welfare. |
| Ano: 2017 |
URL: http://orgprints.org/32862/1/Lazado%20et%20al%20EAS%202017%20RED.pdf |
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| Registros recuperados: 11 | |
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