|Reference : Ontogeny of swimming movements in the catfish Clarias gariepinus|
|Scientific journals : Article|
|Life sciences : Aquatic sciences & oceanology|
Life sciences : Zoology
|Ontogeny of swimming movements in the catfish Clarias gariepinus|
|[fr] Ontogénie de la nage chez le poisson chat Clarias gariepinus|
|Mauguit, Quentin [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Morphologie fonctionnelle et évolutive >]|
|Gennotte, Vincent [Université de Liège - ULg > > Centre de formation et de recherche en aquaculture (CEFRA) >]|
|Becco, Christophe [Université de Liège - ULg > Département de physique > Département de physique >]|
|Baras, Etienne [ > > ]|
|Vandewalle, Nicolas [Université de Liège - ULg > Département de physique > Physique statistique >]|
|Vandewalle, Pierre [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Morphologie fonctionnelle et évolutive >]|
|The Open Fish Science Journal|
|Bentham Science Punlishers Ltd|
|United Arab Emirates|
|[en] Larvae ; swimming ontogeny ; catfishes|
|[en] The swimming movements of C. gariepinus larvae were recorded with a high-speed camera (400, 500 and 800 fps) from 0 to 336 hours post-hatching. Movements of adult fish were also recorded to provide information on the last developmental stage. Seven landmarks positioned on the fish midline were used during tail beating to determine various parameters during ontogeny and, on the basis of these parameters, to describe the first appearance of swimming movements and their development and efficiency during growth.
Larvae were unable to swim at hatching (4 mm total length). Swimming movements were established at 48 hours posthatching when the fish measured between 7 and 8 mm total length and the yolk sac was more than 95% absorbed. At this stage, lateral excursion of the head appeared strongly reduced (from 13% to 6% of the total length). The efficiency of swimming movements increased throughout ontogeny, as did the homogeneity of the speed of the propulsive wave. Spontaneous swimming speed of 1 to 10 TLs-1 were observed in early stage (8-12 hPH). The various speed induced significant variations in parameters such as the amplitude of lateral head movements, swimming efficiency, and body rigidity. No major change was observed at the theoretical flow-regime transition.
|Fonds de la Recherche Fondamentale Collective d'Initiative des Chercheurs - FRFC ; Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA|
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