Abstract
Sand lobster (Thenus orientalis) is one of the lobster species with high commercial values and important seafood product for exporting to the international markets. Specimens were collected monthly from October 2017 to September 2018 at Nam Du island, Kien Giang province to investigate the gonadal development and spawning season. A total of 249 sand lobsters was collected and the results showed that the sexual ratio and the size of this species were high variation, in which the females were always larger size than male. The appearance color and size of ovary were changed during the gonadal development in females, however, those characters were not evident in males. Findings showed that a high proportion of spawning females was presented in February (53.6 %), May (60.0 %) and September (53.8 %). The largest sizes of oocytes were also recorded in those months with corresponding numbers of 113.9 ± 11.8 µm; 146.0± 15.2 µm and 149.6± 12.9 µm. The results of this study could contribute primary information on the productive biology and spawning season of sand lobster to support resource management and artificial seed production.
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