Ontogeny of swimming movements in bronze corydoras (Corydoras aeneus)

Mauguit, Q.; Olivier, D.; Vandewalle, N.; Vandewalle, P.
April 2010
Canadian Journal of Zoology;Apr2010, Vol. 88 Issue 4, p378
Academic Journal
Fish larvae experience fundamental morphological, physiological, and physical changes from hatching to adulthood. All of these changes have an effect on the locomotor movements observed in the larvae. We describe the development of swimming movements in larval bronze corydoras (Corydoras aeneus (Gill, 1858); Ostariophysi, Siluriformes) during their ontogeny. Swimming movements of adults and larvae, aged 0-512 h posthatching, were recorded at 500 frames/s. Movements were analyzed by digitizing points along the fish midline. Movements are described by direct (swimming speed and amplitude of landmarks) and indirect (r2mean and CV of r2 as movement coordination indices; Strouhal number as an efficiency index) parameters. The increase in swimming speed correlated with improvement of movement coordination in both larvae and adults, as well as with an increase in swimming efficiency in larvae. Directly after hatching, swimming movements were coordinated but were not efficient. Efficiency increased rapidly with fish growth up to 8 mm total fish length and disappearance of the yolk sac. These events were coupled with reduction of the maximal lateral amplitude observed along the whole body during swimming. The anguilliform swimming mode was used at hatching, but a transition to the carangiform mode was observed at approximately 17 mm total fish length. De l’éclosion à l’âge adulte, les larves de poissons connaissent des changements morphologiques, physiologiques et physiques fondamentaux. Toutes ces modifications affectent les mouvements de locomotion observés chez les larves. Notre travail décrit le développement les mouvements de locomotion chez des larves de corydoras bronzés (Corydoras aeneus (Gill, 1858); Ostariophyses, Siluriformes) durant l’ontogenèse. Nous avons enregistré les mouvements de nage d’adultes et de larves âgées de 0 à 512 heures après l’éclosion à une fréquence de 500 images/s. Pour l’analyse, nous avons digitalisé des points le long de la ligne médiane des poissons. Nous avons décrit les mouvements à l’aide de variables directes (vitesse de nage et amplitude des points de repère) et indirectes (r2moyenne et CV de r2 comme indices de coordination du mouvement; nombre de Strouhal comme indice d’efficacité). Il existe une corrélation entre l’accroissement de la vitesse de nage et d’une part, l’amélioration de la coordination tant chez les larves que chez les adultes et d’autre part, l’augmentation de l’efficacité de la nage chez les larves. Tout juste après l’éclosion, les mouvements de nage sont coordonnés, mais non efficaces. L’efficacité augmente rapidement avec la croissance jusqu’à ce que les larves atteignent une taille de 8 mm et que le sac vitellin ait disparu. Ces événements coïncident avec la réduction de l’amplitude latérale maximale observée tout le long du corps durant la nage. Le mode de nage anguilliforme est utilisé à l’éclosion, mais il se produit une transition au mode carangiforme à une longueur totale d’environ 17 mm.


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