Sexual development and maturity of the male brown banded bamboo shark
| Autor: | Hesam Sephid, Mohammad Ali Salari, Negin Salamat |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
0303 health sciences Gonad Ecology biology Chiloscyllium punctatum Efferent ducts Anatomy Aquatic Science Oceanography biology.organism_classification 010603 evolutionary biology 01 natural sciences Hemiscylliidae 03 medical and health sciences medicine.anatomical_structure Elasmobranchii Reproductive biology medicine Sexual maturity Ecology Evolution Behavior and Systematics Testosterone 030304 developmental biology |
| Zdroj: | Marine and Freshwater Research. 72:1160-1172 |
| ISSN: | 1448-6059 1323-1650 |
| Popis: | The present study aimed to assess the reproductive biology of male brown banded bamboo shark (Chiloscyllium punctatum). Morphological and histological changes in the reproductive tract and changes in gonad steroid testosterone were assessed in 110 male C. punctatum collected from Bahrakan Creek between January 2018 and March 2019. The reproductive tract in male C. punctatum consisted of a pair of testes, efferent ducts, epididymidis, ductus deferens, seminal vesicles, Leydig gland and claspers. Four sexual development stages were determined: (1) immature, no calcified claspers (2) maturing, partially calcified claspers; (3) active and resting adults. Both adult resting and active stages had calcified claspers. In this study, immature male C. punctatum without calcified claspers were found from August to October, maturing C. punctatum with partially calcified claspers were found from November to January and adult C. punctatum caught from February to April were active with calcified claspers, whereas adult fish collected from May to July and during the rest of the year (until mid-January in the following year) were in the resting stage with inactive testes. The testis had a lobular structure and the spermatocysts were arranged diametrically (i.e. along the cross-sectional width of the testis) in each lobule. Plasma testosterone concentrations were associated with histomorphological changes in the reproductive tract. Testosterone concentrations peaked in March in active males and then decreased significantly in resting males. Overall, the variations in the reproductive organs during different sexual maturity stages were consistent with their roles in the production, movement and release of spermatozoa. |
| Databáze: | OpenAIRE |
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