Resumo
The present paper analyses a case of ovary assimetry verifier! in a specimen of Micropogon fumieri (Desmarest, 1822) Jordan, 1884, captured at San Antonio Cape, Argentina, between the 4th and the 12th of January, 1958. The specimen had the ovaries ful] developed and the following biometric characteristics: total length, 49,6 cm; standard length, 42.5 cm; maximum height, 12.5 cm; total weight, 1,710 g. The following conclusions were drawn: 1 - There was an assimetry of shape, weight and internal structure in the two ovaries; 2 - The right ovary had more ovules per unity of weight than the left one, although there was not a significant difference between the diameter of the ovules; 3 - We can suppose that the right ovary, smaller than the left one, tried to reach an equilibrium with the left one through an increase in the capacity of producing sexual cells per weight unity and so through the reduction of the intersticial materials; 4 - The assimetry was determined during the ontogenetical process and not by any pathological cause; 5 - We suppose that the embryologieal process responsible for the analysed assimetry is similar to the one that occurs among the birds, and so, that among the fishes the right gonada has more lability on the sex determining process.
Sobre um caso de assimetria em ovários de Micropogon furnieri (Desmarest, 1822) Jordan, 1884* * Trabalho realizado no Museu Nacional (Universidade do Brasil, DF), sob os auspícios da Campanha Nacional de Aperfeiçoamento do Pessoal de Nível Superior e do Banco do Nordeste do Brasil S/A.
Melquíades Pinto Paiva
Escola de Agronomia, Universidade do Ceará, Fortaleza, CE, Brasil
SUMMARY
The present paper analyses a case of ovary assimetry verifier! in a specimen of Micropogon fumieri (Desmarest, 1822) Jordan, 1884, captured at San Antonio Cape, Argentina, between the 4th and the 12th of January, 1958. The specimen had the ovaries ful] developed and the following biometric characteristics: total length, 49,6 cm; standard length, 42.5 cm; maximum height, 12.5 cm; total weight, 1,710 g.
The following conclusions were drawn:
1 - There was an assimetry of shape, weight and internal structure in the two ovaries;
2 - The right ovary had more ovules per unity of weight than the left one, although there was not a significant difference between the diameter of the ovules;
3 - We can suppose that the right ovary, smaller than the left one, tried to reach an equilibrium with the left one through an increase in the capacity of producing sexual cells per weight unity and so through the reduction of the intersticial materials;
4 - The assimetry was determined during the ontogenetical process and not by any pathological cause;
5 - We suppose that the embryologieal process responsible for the analysed assimetry is similar to the one that occurs among the birds, and so, that among the fishes the right gonada has more lability on the sex determining process.
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BIBLIOGRAFIA
- Breder Jr., C. M. 1922. Hermaphroditism of a croaker, Micropogon undulatus (Linnaeus). Zoologica, N.Y., vol. 2, n.ş 13, p. 281-284, 1 fig.
- D'Ancona, U. 1950. Détermination et différenciation du sexe chez les poissons. Arch. Anat. Micr. Morph, Exp., vol. 39, n.ş 3, p. 274-292, 10 figs.
- Hoar. W. S. 1957. The gonads and reproduction. In The physiology of fishes, vol. 1, Metabolism, p. 287-321, 11 figs. New York, Academic Press.
- Witschi, E. 1951. Embryogenesis of the adrenal and the reproductive glands. Recent Progr. Hormone Res., vol. 6, p. 1-23, 14 figs.
Datas de Publicação
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Publicação nesta coleção
14 Jun 2012 -
Data do Fascículo
1958
