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Characterisation of post-larval to juvenile stages, metamorphosis and recruitment of an amphidromous goby, Sicyopterus lagocephalus (Pallas) (Teleostei : Gobiidae : Sicydiinae)

Keith P., Hoareau T.B., Lord C., Ah-Yane O., Gimonneau G., Robinet T., Valade P.. 2008. Marine and Freshwater Research, 59 (10) : p. 876-889.

Sicyopterus lagocephalus post-larvae migrating in Mascarene Archipelago rivers, La Réunion Island, provide an important food source to local populations and fishing activity has a socioeconomic impact. Improved knowledge of the life traits and the characterisation of post-larval stages should enable a better understanding of physiological changes triggering migratory behaviour. It would also help to explain the recruitment processes to managers and to implement conservation measures for stock management. Sicyopterus lagocephalus is an amphidromous fish: adults live in rivers, but larvae are carried to the sea after hatching. The present study characterised the metamorphosis and post-larval stages of Sicyopterus lagocephalus during river recolonisation on La Réunion Island. The results show that cranium reorganisation and pectoral fins transformation are part of the first and major transformations and are completed less than 2 weeks after freshwater colonisation (post-larval stages PL1 and PL2). These transformations, mobilising all the available calcium, seem to be critical for survival in their new environment. Individuals then progressively acquire pigmentation, complete scalation and the fork at the end of the caudal fin disappears (juvenile stages J1 and J2). The end of the recruitment phase takes place 21 to 28 days after entering the river mouth, when territorial behaviour appears. (Résumé d'auteur)

Mots-clés : physiologie animale; anatomie animale; stade de développement animal; métamorphose; larve; sicyopterus lagocephalus; réunion

Thématique : Production de l'aquaculture; Physiologie et biochimie animales; Anatomie et morphologie des animaux

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