Descrição do ciclo reprodutivo de Donax hanleyanus (Bivalvia, Donacidae) no sul do Brasil Description of the reproductive cycle of Donax hanleyanus (Bivalvia, Donacidae) in southern Brazil
oleh: Guacira M. Gil, José W. Thomé
| Format: | Article |
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| Diterbitkan: | Fundação Zoobotânica do Rio Grande do Sul 2004-09-01 |
Deskripsi
<abstract language="eng">The changes in gonadal development in male and female of Donax hanleyanus Philippi, 1847 are described. Gonad development and spawning seasons were assessed by monthly sampling of population from Arroio Teixeira beach, southern Brazil. Histological examination of clams showed in the most of the adult population sampled that the spawning is practically continuous, without any period of sexual rest. There are two main periods of gametogenesis, in winter and in summer, being the degree of maturation longer in the latter. The water temperature is stimulant on gametes proliferation and spawning.