Early chronic hypoxia does not impact rainbow trout behaviour later in life
In trout aquaculture, tight control of water quality is crucial, especially for young life-history stages. This study examined whether chronic exposure to moderate hypoxia during the fry stage affects the rainbow trout’s behavior during later development. One month after yolk-sac resorption, young t...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-11-01
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| Series: | Aquaculture Reports |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352513420305445 |
| _version_ | 1818341843876708352 |
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| author | Claudiane Valotaire Frédéric Borel Christine Leterrier Laurence A. Guilloteau Violaine Colson |
| author_facet | Claudiane Valotaire Frédéric Borel Christine Leterrier Laurence A. Guilloteau Violaine Colson |
| author_sort | Claudiane Valotaire |
| collection | DOAJ |
| description | In trout aquaculture, tight control of water quality is crucial, especially for young life-history stages. This study examined whether chronic exposure to moderate hypoxia during the fry stage affects the rainbow trout’s behavior during later development. One month after yolk-sac resorption, young trout were exposed for 25 days to hypoxia, obtained by decreasing water flow and bubbling nitrogen gas into the tank (Hypoxia group, H: mean O2: 4.85 mg/L; min: 3.83, max: 6.87 mg/L). A control group was maintained in optimal conditions (C: mean O2: 10.41 mg/L; min: 10.12, max: 10.69 mg/L). At 4 days post-hypoxia, basal (resting) whole body cortisol levels were significantly higher in the H group (166.84 ± 20.67 ng/g) as compared to the C group (103.71 ± 8.78 ng/g), but no post-stress differences were evident (values ∼ 175 ng/g). Long-term effects of hypoxia on various behavioural traits were analysed between 3 and 4 months after the return to normoxia and compared to the C group. The exposure of fry to chronic hypoxia did not impact the fish’s behavioural repertoire (activity, stereotypic behaviour, aggression) in their home tanks after re-acclimation to normoxia. Moreover, basal and post-stress plasma cortisol levels, fear-related behaviours (novel-tank test), and risk-taking behaviours (emergence test) did not differ between the C and H groups. However, this early challenge resulted in an enhanced post-hypoxic growth rate in these fish. Our results show that early exposure to moderate hypoxia does not induce any behavioural changes in rainbow trout after several months of return to normoxia. |
| first_indexed | 2024-12-13T16:05:14Z |
| format | Article |
| id | doaj.art-e46fffc0d9f24e1a9db6597ae81a5511 |
| institution | Directory Open Access Journal |
| issn | 2352-5134 |
| language | English |
| last_indexed | 2024-12-13T16:05:14Z |
| publishDate | 2020-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Aquaculture Reports |
| spelling | doaj.art-e46fffc0d9f24e1a9db6597ae81a55112022-12-21T23:39:04ZengElsevierAquaculture Reports2352-51342020-11-0118100454Early chronic hypoxia does not impact rainbow trout behaviour later in lifeClaudiane Valotaire0Frédéric Borel1Christine Leterrier2Laurence A. Guilloteau3Violaine Colson4INRAE, UR1037 Laboratoire de Physiologie et Génomique des Poissons, F-35000 Rennes, FranceINRAE, UR1037 Laboratoire de Physiologie et Génomique des Poissons, F-35000 Rennes, FranceINRAE, UMR85 Physiologie de la Reproduction et des Comportements, France; CNRS-UMR 7247, France; Université François Rabelais de Tours, France; IFCE, F-37380 Nouzilly, FranceBiologie des Oiseaux et Aviculture, INRAE, Université de Tours, F-37380 Nouzilly, FranceINRAE, UR1037 Laboratoire de Physiologie et Génomique des Poissons, F-35000 Rennes, France; Corresponding author at: INRAE, UR1037 Fish Physiology and Genomics, F-35000 Rennes, France.In trout aquaculture, tight control of water quality is crucial, especially for young life-history stages. This study examined whether chronic exposure to moderate hypoxia during the fry stage affects the rainbow trout’s behavior during later development. One month after yolk-sac resorption, young trout were exposed for 25 days to hypoxia, obtained by decreasing water flow and bubbling nitrogen gas into the tank (Hypoxia group, H: mean O2: 4.85 mg/L; min: 3.83, max: 6.87 mg/L). A control group was maintained in optimal conditions (C: mean O2: 10.41 mg/L; min: 10.12, max: 10.69 mg/L). At 4 days post-hypoxia, basal (resting) whole body cortisol levels were significantly higher in the H group (166.84 ± 20.67 ng/g) as compared to the C group (103.71 ± 8.78 ng/g), but no post-stress differences were evident (values ∼ 175 ng/g). Long-term effects of hypoxia on various behavioural traits were analysed between 3 and 4 months after the return to normoxia and compared to the C group. The exposure of fry to chronic hypoxia did not impact the fish’s behavioural repertoire (activity, stereotypic behaviour, aggression) in their home tanks after re-acclimation to normoxia. Moreover, basal and post-stress plasma cortisol levels, fear-related behaviours (novel-tank test), and risk-taking behaviours (emergence test) did not differ between the C and H groups. However, this early challenge resulted in an enhanced post-hypoxic growth rate in these fish. Our results show that early exposure to moderate hypoxia does not induce any behavioural changes in rainbow trout after several months of return to normoxia.http://www.sciencedirect.com/science/article/pii/S2352513420305445BehaviourFearfulnessCortisolEarly stressHypoxiaRainbow trout |
| spellingShingle | Claudiane Valotaire Frédéric Borel Christine Leterrier Laurence A. Guilloteau Violaine Colson Early chronic hypoxia does not impact rainbow trout behaviour later in life Aquaculture Reports Behaviour Fearfulness Cortisol Early stress Hypoxia Rainbow trout |
| title | Early chronic hypoxia does not impact rainbow trout behaviour later in life |
| title_full | Early chronic hypoxia does not impact rainbow trout behaviour later in life |
| title_fullStr | Early chronic hypoxia does not impact rainbow trout behaviour later in life |
| title_full_unstemmed | Early chronic hypoxia does not impact rainbow trout behaviour later in life |
| title_short | Early chronic hypoxia does not impact rainbow trout behaviour later in life |
| title_sort | early chronic hypoxia does not impact rainbow trout behaviour later in life |
| topic | Behaviour Fearfulness Cortisol Early stress Hypoxia Rainbow trout |
| url | http://www.sciencedirect.com/science/article/pii/S2352513420305445 |
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