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| Vaïtilingon, D.; Rasolofonirina, R.; Jangoux, M.. |
| 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... |
| Tipo: Journal Contribution |
Palavras-chave: TRIPNEUSTES GRATILLA; Abiotic factors; Sexual maturity; Reproductive cycle; Temperature; Sea water; Maturity; Temperature. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1133 |
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| Vaïtilingon, D.; Rasolofonirina, R.; Eeckhaut, I.; Jangoux, M.. |
| The reproductive cycle and gonad morphology were investigated in a population of Holothuria scabra (Jaëger, 1833) from Toliara, south-west of Madagascar. Surveys were done from November 1998 to April 2001 by monthly samplings of 30 individuals. There is a single gonad formed by a tuft of numerous ramified tubules. The annual reproductive cycle of the population was determined from monthly variations of the gonad index and the maturity index. Five sexual maturity stages were described. An annual reproductive cycle occurred with most individuals being mature or spawning between November and April. Gametogenesis was not synchronous in the population, but was synchronous in all the tubules of a single gonad except the smallest immature ones (length < 1 cm).... |
| Tipo: Journal Contribution |
Palavras-chave: Reproductive cycle; Spawning. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1134 |
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