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| Registros recuperados: 13 | |
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| Ferrari, Sebastien. |
| This thesis is organized in three principal parts. The first part of this thesis highlights the existence of coping style in seabass, revealing links between behavioral and physiological responses following a stress. The proactive individuals showed a weaker activation of the HPI axis, resulting in a lesser increase of plasmatic cortisol levels after a stress compared to reactive fish. However, the links between personality traits and activation of the dopaminergic and serotonergic systems could not be clearly demonstrated. The individual tests appeared discriminating personality, but did not allow observing coherent responses in time likely because of the stressing character of the isolated situation in this social species. The use of tests in group... |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00266/37738/35754.pdf |
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| Ferrari, Sebastien; Chatain, Beatrice; Cousin, Xavier; Leguay, Didier; Vergnet, Alain; Vidal, Marie-odile; Vandeputte, Marc; Begout, Marie-laure. |
| Although individual electronic tagging using PIT (Passive Integrated Transponder) tags is well established, it is mainly used for fish > 60 mm in length. Since electronic tagging is an ideal identification method, we used RFID (Radio Frequency Identification) microtags (6 mm in length, 1 mm in diameter, 10 mg in mass) to characterize individual fish from the early stages of their development and throughout their lifecycles. We used sea bass, Dicentrarchus labrax, (105 day-old fish weighing between 100 and 1100 mg) and studied the effects of intra-coelomic tagging in half the population using different endpoints including survival and tag reading, growth over 6 months and swimming responses. Dead fish were counted daily, biometric data were collected at... |
| Tipo: Text |
Palavras-chave: Tagging effects; Swimming behavior; Sexual dimorphism; Dicentrarchus labrax. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00175/28645/27072.pdf |
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| Besson, Mathieu; Allal, Francois; Chatain, Beatrice; Vergnet, Alain; Clota, Frederic; Ferrari, Sebastien; Vandeputte, Marc. |
| We estimated genetic parameters of feed conversion ratio (FCR) and daily growth coefficient (DGC) using individual phenotypes measured in aquariums under a restricted feeding regime and genomic information on 2,722 SNP markers. The results showed a moderate heritability of both traits (0.26 for FCR and 0.41 for DGC) as well as close to unity negative genetic correlation between them. Thus, FCR of fish in aquariums could be improved by selecting fish for higher DGC. Nevertheless, these results must be taken with caution until we know whether individual FCR measured in aquariums also reflects the FCR of fish reared in groups. |
| Tipo: Text |
Palavras-chave: Feed efficiency; Fish; Genomics. |
| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00446/55756/57416.pdf |
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| Ferrari, Sebastien; Horri, Khaled; Allal, Francois; Vergnet, Alain; Benhaim, David; Vandeputte, Marc; Chatain, Beatrice; Begout, Marie-laure. |
| To understand the genetic basis of coping style in European seabass, fish from a full factorial mating (10 females x 50 males) were reared in common garden and individually tagged. Individuals coping style was characterized through behavior tests at four different ages, categorizing fish into proactive or reactive: a hypoxia avoidance test (at 255 days post hatching, dph) and 3 risk-taking tests (at 276, 286 and 304 dph). We observed significant heritability of the coping style, higher for the average of risk-taking scores (h2 = 0.45 ± 0.14) than for the hypoxia avoidance test (h2 = 0.19 ± 0.10). The genetic correlations between the three risk-taking scores were very high (rA = 0.96–0.99) showing that although their repeatability was moderately high (rP =... |
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| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00362/47278/47239.pdf |
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| Ferrari, Sebastien; Rey, Sonia; Høglund, Erik; Øverli, Øyvind; Chatain, Beatrice; Mackenzie, Simon; Bégout, Marie-laure. |
| Individual stress coping style (reactive, intermediate and proactive) was determined in 3 groups of 120 pit tagged European seabass using the hypoxia avoidance test. The same three groups (no change in social composition) were then reared according to the standards recommended for this species. Then, 127 days later, individuals initially characterized as reactive, intermediate or proactive were submitted to an acute confinement stress for 30 min. Blood samples were taken to measure plasma cortisol levels 30 min (Stress30) or 150 min (Stress150) after the end of the confinement stress. Individuals were then sacrificed to sample the telencephalon in order to measure the main monoamines and their catabolites (at Stress30 only). Individuals from Stress150 were... |
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Palavras-chave: Fish; Behavior; Physiology; Personality; Brain; Transcriptomic. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00601/71330/69760.pdf |
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| Ferrari, Sebastien; Leguay, Didier; Vergnet, Alain; Vidal, Marie-odile; Chatain, Beatrice; Begout, Marie-laure. |
| Biological variability is no longer considered as statistical noise, but rather as an adaptive benefit. This variability comes from consistent differences in behavioral and physiological responses among individuals to a changing/challenging environment, named “coping style”, “temperament” or “personality”. Many studies have described how to characterize personality traits and how to assess their consistency over time and between different contexts; however, little is known about the environmental factors shaping personality development. Because contrasting personalities are maintained with evolution, this lead to the widespread assumption that genes play a predominant role in personality. In many cases, personality traits are however also likely to be... |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00333/44433/44100.pdf |
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| Registros recuperados: 13 | |
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