| Communautés de recherche et d'enseignement représentées dans DSpace |
|
Africa
[1741]
|
|
GEOHAB
[8]
|
|
IODE
[556]
|
|
Latin America
[2044]
|
|
OceanDocs SG
[4]
|
| |
|
Flux RSS
|
|
| |
| Contact: |
Administrator
|
|
| | | | Links: | | | Search engines:
Agris, Avano, Google Scholar, OAIster, VOA3R
Repositories:
Aquatic Commons, Archimer, Archive Institutionnelle de l'Ifremer, IRD Documentation, ePrints Soton (Oceanography), Woods Hole Open Access Server, Marine & Ocean Science ePrints Archive @ Plymouth, DRS at National Institute Of Oceanography, Institute of Biology of the Southern Seas
More information about AgriOcean Dspace at AIMS |
|
OceanDocs >
Africa >
Indian Ocean >
WIOMSA >
Western Indian Ocean Journal of Marine Science - Archive >
Veuillez utiliser cette adresse pour citer ce document :
http://hdl.handle.net/1834/1133
|
| Titre: | Reproductive cycle of edible echinoderms from the Southwestern Indian Ocean: I. Tripneustes gratilla L. (Echinoidea, Echinodermatata) |
| Auteur(s): | Vaïtilingon, D.
Rasolofonirina, R.
Jangoux, M. |
| mot-clé ASFA: | Abiotic factors
Sexual maturity
Reproductive cycle
Temperature
Sea water |
| Date de publication: | 2005 |
| Editeur: | WIOMSA |
| Référence bibliographique: | Western Indian Ocean Journal of Marine Science, 4(1). p. 47-60 |
| Résumé: | The reproductive cycle of the edible echinoid Tripneustes gratilla (Linneaus 1758) was investigated in a population located in the southwest coast of Madagascar (Toliara). The reproductive cycle was followed for two consecutive years (October 1999 to October 2001) and characterised by means of gonad and maturity indices. T. gratilla has an annual reproductive cycle mediated by seawater temperature, day length and feeding activity. The histology of the gonads revealed six different maturity stages grouped in three main reproductive phases: growing and maturing, spawning, and spent and recovering. Reproduction is seasonal. Growing and maturing stages occurred from late summer to early winter correlating with decreasing temperatures and day length. Spawning occurred during mid and later winter, when temperatures and day lengths were lowest. Spent and recovering urchins were observed from late summer to early winter. Besides, the reproductive cycle was also influenced by food quantity in the gut, the repletion index was higher after spawning and gametogenesis started when sufficient amount of nutrient reserves accumulated in gut tissues and nutritive phagocytes of the gonads. This study reveals that the maturity index, based on histological analysis of gonads, is more reliable than gonad index in characterising the reproductive cycle of echinoids. In view of fishery management, we recommend harvest of T. gratilla from November to February, when individuals are in the pre-gametogenic stages. |
| URI/URL: | http://hdl.handle.net/1834/1133 |
| URL d'une autre version: | http://www.wiomsa.org |
| ISSN: | 0856-860X |
| Collection(s) : | Western Indian Ocean Journal of Marine Science - Archive
|
Fichier(s) constituant ce document :
|
Tous les documents dans DSpace sont protégés par copyright, avec tous droits réservés.
|
