Sustained exercise improves vertebral histomorphometry and modulates hormonal levels in rainbow trout

• Published in: Aquaculture
• Main Authors: Deschamps, Marie-Helene, Labbé, Laurent, Baloche, Sylvie, Fouchereau-Peron, Martine, Dufour, Sylvie, Sire, Jean-Yves
• Other Authors: Systématique, adaptation, évolution (SAE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA), Station de Biologie Marine de Concarneau, Direction générale déléguée à la Recherche, à l’Expertise, à la Valorisation et à l’Enseignement-Formation (DGD.REVE), Muséum national d'Histoire naturelle (MNHN)-Muséum national d'Histoire naturelle (MNHN)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2009
• Subjects: Swimming; Vertebrae; Mineralization; Skeletal abnormalities; Thyroid hormones; Calcitonin; Onchorhynchus mykiss; MESH: SALMON SALMO-SALAR; MESH: DICENTRARCHUS-LABRAX L; MESH: DIETARY PHOSPHORUS REQUIREMENT; MESH: ONCORHYNCHUS-MYKISS WALBAUM; MESH: RED-SEA BREAM; MESH: ATLANTIC-SALMON; MESH: FRESH-WATER; MESH: OSTEOLOGICAL DEVELOPMENT; MESH: ANADROMOUS MIGRATION; MESH: SPAWNING MIGRATION; [SDV.BDD]Life Sciences [q-bio]/Development Biology; Atlantic salmon; Salmo salar
• Online Access: https://hal.archives-ouvertes.fr/hal-00440729; https://doi.org/10.1016/j.aquaculture.2009.07.016

International audience Abnormal compressions and fusions of vertebral bodies are frequently observed in reared rainbow trout and could result from chronic and unbearable muscle pressures acting oil the axial skeleton during intensive growth. Sustained swimming at moderate speeds was shown to induce many positive effects on growth and swimming performances in salmonids, but yet little is known about ts effects on vertebral remodeling processes and related hormonal regulation. Rainbow trout were subjected to three different swimming speeds (0, 10 and 1.5 body length (BL) s(-1)), starting one month after they were first fed (65 mm) and ending when they reached 260 mm in size (market-size of 275 g) At the end of the experiment, 20 trout were sampled in each lot (N=60) and blood samples were taken. Vertebrae abnormalities were assessed by radiological examinations. Vertebrae from the middle axial region (V32-38) were selected to evaluate bone mineralization (BM) and total bone area (Tt-B.Ar.) on radiographed transverse sections (125 +/- 10 mu m). Assays were performed to evaluate mineral homeostasis (calcemia and phosphatemia), bone cell activities (alkaline phosphatase, ALP, and tartrate-resistant acid phosphatase, TRAP) and bone regulating hormones (calcitonin, CT and thyroid hormones, THs). Sustained exercise reduced the appearance of fused vertebrae, enhanced vertebral BM and decreased vertebral Tt-B.Ar. while it increased circulating CT and TH levels No variations were observed on mineral homeostasis and bone cell activities. Increasing the swimming speed up to 15 BL s(-1) had positive effects on the vertebral skeleton, and therefore, seems to be a suitable approach to prevent aggravation of vertebral abnormalities in juvenile trout. The changes observed in vertebral features are interpreted as a compromise between the necessity to mobilize vertebral mineral ions in response to various physiological demands and to maintain vertebral strength against mechanical constraints