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Title

Growth-promoting effects of sustained swimming in fingerlings of gilthead sea bream (Sparus aurata L.)

AuthorsBlasco, Josefina; Moya, A.; Millán-Cubillo, A.; Vélez, E. J.; Capilla, E.; Pérez-Sánchez, Jaume ; Gutiérrez, Joaquim; Fernández-Borràs, Jaume
KeywordsCOX/CS
δ13C/δ15
White muscle
RNA/DNA
NIGF-I/GH
Exercise
Issue DateDec-2015
PublisherElsevier
CitationJournal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology 185(8): 859-868 (2015)
AbstractFish growth is strongly influenced by environmental and nutritional factors and changing culture conditions can help optimize it. The importance of early-life experience on the muscle phenotype later in life is well known. Here, we study the effects of 5 weeks of moderate and sustained swimming activity (5 BL s) in gilthead sea bream during early development. We analysed growth and body indexes, plasma IGF-I and GH levels, feed conversion, composition [proximate and isotopic (N/C)] and metabolic key enzymes (COX, CS, LDH, HOAD, HK, ALAT, ASAT) of white muscle. Moderate and continuous exercise in fingerlings of gilthead sea bream increased plasma IGF-I, whereas it reduced plasma GH. Under these conditions, growth rate improved without any modification to feed intake through an increase in muscle mass and a reduction in mesenteric fat deposits. There were no changes in the content and turnover of muscle proteins and lipid reserves. Glycogen stores were maintained, but glycogen turnover was higher in white muscle of exercised fish. A lower LDH/CS ratio demonstrated an improvement in the aerobic capacity of white muscle, while a reduction in the COX/CS ratio possibly indicated a functional adaptation of mitochondria to adjust to the tissue-specific energy demand and metabolic fuel availability in exercised fish. We discuss the synergistic effects of dietary nutrients and sustained exercise on the different mitochondrial responses.
Publisher version (URL)https://doi.org/10.1007/s00360-015-0933-5
URIhttp://hdl.handle.net/10261/144433
DOIhttp://dx.doi.org/10.1007/s00360-015-0933-5
Identifiersissn: 0174-1578
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