Sex hormones play an essential role in sexual differentiation, maintenance of sexual characteristics, gamete maturation and mating behavior. Very little is known of their dynamics in mollusks. A study was done of sex hormone (17β - estradiol, testosterone and progesterone) concentrations in male and female Strombus pugilis to identify their variations at different gonadal stages. A total of ninety organisms (thirty per month) were collected in February, September and November of 2016. The gonadal digestive gland complex of each specimen was dissected and divided into two sections. One section was set in alcoholic Bouin’s fluid and processed with classic histological techniques, the second was macerated with 80% ethanol to extract steroids and analyzed by enzyme immunoassays. Histological section analysis was used to classify gonadal development into three stages: gametogenesis, mature and undifferentiated. Mature females were observed in September. Testosterone and 17β-estradiol concentrations in both sexes were highest in the mature stage. In S. pugilis, 17β-estradiol, progesterone and testosterone were all present, with higher concentrations associated with reproductive activity.
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Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional - Unidad Mérida, Laboratorio de Biología y Cultivo de Moluscos, Antigua Carretera a Progreso Km. 6, 97310 Mérida, Yucatán, Mexico
Appeared or available online: March 18, 2020