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Reduced swimming abilities in fast-growing transgenic common carp Cyprinus carpio associated with their morphological variations

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Critical swimming speeds (Ucrit) and morphological characters were compared between the F4 generation of GH-transgenic common carp Cyprinus carpio and the non-transgenic controls. Transgenic fish displayed a mean absolute Ucrit value 22ยท3% lower than the controls. Principal component analysis identified variations in body shape, with transgenic fish having significantly deeper head, longer caudal length of the dorsal region, longer standard length (LS) and shallower body and caudal region, and shorter caudal length of the ventral region. Swimming speeds were related to the combination of deeper body and caudal region, longer caudal length of the ventral region, shallower head depth, shorter caudal length of dorsal region and LS. These findings suggest that morphological variations which are poorly suited to produce maximum thrust and minimum drag in GH-transgenic C. carpio may be responsible for their lower swimming abilities in comparison with non-transgenic controls.
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Keywords: cyprinidae; growth; morphology; swimming performance; trade-off; transgene

Document Type: Regular Paper

Affiliations: Graduate University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China

Publication date: 2009-01-01

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