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Researches on the sexual inversion and hermaphroditism phenomenon in Xiphophorus helleri species

Domenii publicaţii > Biologie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: B.Pasarin, G.Hoha, Alexandrina Diac, R. Radu-Rusu, A.Gruber

Editorial: Organizing Commitee of the XXXVI ESNA Annual Meeting, Iasi, Romania, Ion Ionescu de la Brad, Iasi, ESNA Abstracts and Book of Abstracts, ESNA Book Program and Papers, ISBN (10) 973-7921-81-9, ISBN (13) 978-973-7921-81-9, XXXVI- th Annual Meeting of ESNA, p.34-36, 128, 2006.

Rezumat:

The sexuality thematic, biologically speaking, represents one of the very frequently acceded research topics. The data recorded from this kind of experiments surpass the existing theoretical level of the knowledge, generating practical reports, well founded on scientific facts.
Several times, in fish species presenting individual genders, the males differ from females through the type, shape and structure of the reproductive system as well as through the main metabolism properties and through the sum of all the gender-related characteristics, also known as sexual dimorphism (exterior body coloration, copulation organ development, fins transformations, specific development of the jaw bones etc.).
The results issued from the study we’ve set up on three groups of females, belonging to the X. helleri species, are exposed within this paper. The final analysis focuses on the females that metamorphosed into males or that tended to do so.
Therefore, according to the results we obtained, we could state that, in some situations, the females metamorphosis into males before they reach sexual maturity (they did not mate yet and perhaps the ovaries did not deliver any eggs) as well as after their 1st or more reproductive cycles.
Some females were slaughtered, in some randomly chosen moments, but only after their metamorphosis into males, in order to observe the internal structure of the reproductive system or to show up any occurred structural change of that system. Prior to the dissection moment, we noticed that the metamorphosis from female to male generated not only some secondary gender-related characteristics, but obviously some radical modifications of the reproductive system structure.

Cuvinte cheie: inversiune sexuala, hermafroditism, Xiphophorus helleri // sexual inversion, hermaphroditism, Xiphophorus helleri

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