Estimativa populacional de folículos pré-antrais in situ de Sotalia fluviatilis (Cetacea, Delphinidae)

• Ano de defesa: 2000
• Autor(a) principal: Cavallante, Andréa Pighinelli
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Ciencias agrárias; Oocito; Reprodução; Ovário; Sotalia fluviatilis; Preantral follicles; Oocyte; Reproduction; Ovary
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/18235

Tucuxi, Sotalia fluviatilis, a coastal cetacean species threatened by artisanal fishing, needs a reproductive biology study in order to manage and preserve the populations subject to mortality for antropic action. A in situ of the preantral follicles allows a better understanding of the preantral phase of the folliculogenesis, little known in cetaceans and totally unknown in S. fluviatilis. Quantitative analysis of the preantral follicle was made in ovarian of S. fluviatilis recovered on the Ceara coast between 1997-1999. The age of the studied sample varied from 0 to 23 years, being sexual maturation above 6 years. The population preantral follicular analysed, was completely degenerate, possibly because of “pos-morten” time. Even so, significant difference were observed among sexual maturation stage, whwere immature animals showed na averege of 1.162.460 follicles, while in matures animals the averege was 66.270 follicles. Due to anatomic position of the ovarian, it was observed that the left ovarian had a higher number of follicles when compared to the right one. This difference was significant only for immature animals. There wasn’t a significant difference related to weight of right and left ovarian of mature and imature sample. Number of follicles showed a negative relation with age and weight of the ovarian, although weight had a positive relation with age. These results indicate that the population follicular fo S. fluviatilis may be affected by many factors such as: reproductive stage, age, ovarian weight and anatomical position of the ovary. Quantitative data of the foliculogenisis described can be used as a parameter for future studies in vitro or in vivo of the folliculogenisis of S. fluviatilis. From this, new information about preantral follicles of S. fluviatilis can be acquired, leading to new reserch to explain the folliculogenese of preantral follicles phase of the species, contributing to a better utilization of oociterio potencial.