Annual Reproductive Cycle of the Common Snook: Endocrine Correlates of Maturation
| Autor: | Ronald G. Taylor, Leslie F. Jackson, Craig V. Sullivan, Steven B. Roberts, Harry J. Grier, William King |
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| Rok vydání: | 1999 |
| Předmět: |
medicine.medical_specialty
food.ingredient biology Centropomus Common snook Aquatic Science biology.organism_classification Gonadosomatic Index Vitellogenin Animal science Endocrinology food Internal medicine Yolk Seasonal breeder biology.protein medicine Vitellogenesis Ecology Evolution Behavior and Systematics Testosterone |
| Zdroj: | Transactions of the American Fisheries Society. 128:436-445 |
| ISSN: | 1548-8659 0002-8487 |
| DOI: | 10.1577/1548-8659(1999)128<0436:arcotc>2.0.co;2 |
| Popis: | Wild common snook Centropomus undecimalis were captured off the Gulf coast of Florida over a 2-year period and sampled for serum and gonad tissue to characterize their annual reproductive cycle. During the summer months, levels of the sex steroid hormones estradiol-17β (E2) and testosterone (T) in females were significantly elevated above basal winter values. Mean gonadosomatic index (GSI) was also significantly elevated in females during summer. In addition, fish whose ovaries contained oocytes in vitellogenic and final maturation stages had elevated levels of alkali-labile protein phosphorus (ALPP), an indirect measure of the egg yolk precursor, vitellogenin. Peak levels of E2, T, and ALPP were measured in females during the spawning season (late summer) when GSI was also maximal. Circulating levels of T and 11-ketotestosterone (11-KT) in males were also higher in the summer months than at any other time of the year. Males showed an increase in GSI over basal winter values during the summer mon... |
| Databáze: | OpenAIRE |
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