Diplectrum radiale (Quoy & Gaimard, 1824) (Serranidae): A rare case of simultaneous hermaphroditism in a teleost fish

This study generates, for the first time, information on the reproductive traits of the simultaneous hermaphrodite Diplectrum radiale. The specimens were captured bimonthly in two distinct ecosystems along the south‐eastern Brazilian coast. The mature ovotestes were removed, preserved in formalin an...

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Bibliographic Details
Published in:Acta zoologica (Stockholm) 2018-07, Vol.99 (3), p.244-257
Main Authors: Costa, Eudriano F. S., Dias, June F., Murua, Hilario
Format: Article
Language:English
Subjects:
Biological fertilization
Coastal environments
Cysts
Diplectrum radiale
Ducts
Ecosystems
Estuaries
Estuarine dynamics
Estuarine environments
Fecundity
Fertilization
Fish
Hermaphroditism
Oocytes
Organizations
Ovaries
ovotestis development
reproductive strategy
Self-fertilization
Spermatogenesis
Testes
Tissues
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Summary:This study generates, for the first time, information on the reproductive traits of the simultaneous hermaphrodite Diplectrum radiale. The specimens were captured bimonthly in two distinct ecosystems along the south‐eastern Brazilian coast. The mature ovotestes were removed, preserved in formalin and examined using histological techniques. The results revealed indeterminate fecundity with asynchronous ovarian organization. All spermatogenesis occurs within cysts, and the spermatogonial distribution indicated an unrestricted testicular type. The testicular and ovarian tissues were separated from each other by different ducts, indicating no possibility of internal self‐fertilization. The hydrated oocytes were stored in the accessory reproductive structure for at least 24 hr. The presence of atretic hydrated oocytes within this structure and the positive periodic acid–Schiff reaction of the villi‐like projections revealed the function of the ovary sinus as absorbing unspawned oocytes. The relative batch fecundity ranged from 62 to 209 oocytes/g (126 ± 42) for specimens from the coast and from 52 to 203 oocytes/g (113 ± 57) for those sampled in the estuary. The potential batch fecundity was linearly related to size, weight, and the gonadosomatic and hepatosomatic indices, revealing that these parameters significantly affect the reproductive potential of D. radiale.
ISSN:0001-7272
1463-6395
DOI:10.1111/azo.12206