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Histological characterization of oocyte developmental stages of suruvi Steindachneridion scriptum kept in captivity Translated title: Caracterização histológica das fases de desenvolvimento ovocitário de suruvi Steindachneridion scriptum em condições de cativeiro

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      Abstract

      ABSTRACT. Stages of oocyte development were described for suruvi females (Steindachneridion scriptum) kept in captivity. Oocytes of 21 mature or maturing females and ovaries of 12 immature females were fixed in Karnovsky solution for 4 and 12 hours, respectively. After, they were processed for routine histology, embedded in paraffin and stained with hematoxylin-eosin. Slides were examined under a light microscope and the oocytes were measured using the LAS EZ software, using the average between the largest and the smallest diameter of each oocyte for representation. There were six types of oocytes: Chromatin nucleolus: found in immature females, with average diameter of 9.5 ± 4.46 μm; Perinucleolar: present in all developmental stages with average diameter of 67.6 ± 15.61 μm; Cortical alveolar: measuring 175.6 ± 56.58 μm; Vitellogenic: average diameter of 797.65 ± 136.10 μm; Mature: with average diameter of 1184.98 ± 171.13 μm and Atretic, which were found in mature or maturing females of suruvi.

      Translated abstract

      RESUMO. As fases de desenvolvimento ovocitário de fêmeas de suruvi (Steindachneridion scriptum) mantidas em cativeiro foram descritas. Ovócitos de 21 fêmeas maduras ou em maturação e ovários de 12 fêmeas imaturas foram fixados em solução de Karnovsky por 4 e 12 horas, respectivamente. Em seguida, foram processados por meio das técnicas rotineiras da histologia, com inclusão em parafina e coloração em hematoxilina-eosina. As lâminas foram analisadas em microscópio de luz e os ovócitos foram medidos por meio do software LAS EZ, usando-se a média entre o maior e o menor diâmetro de cada ovócito para representá-lo. Foi possível caracterizar seis tipos de ovócitos: Cromatina-nucléolo: observado nas fêmeas imaturas, com diâmetro médio de 9,5 ±4,46 μm; Perinucleolar: presente em todas as fases de desenvolvimento e com diâmetro médio de 67,6 ±15,61 μm; Alvéolo-cortical: medindo 175,6 ±56,58 μm; Vitelogênico: com diâmetro médio de 797,65 ±136,10 μm; Maduro: com diâmetro médio de 1184,98 ±171,13 μm e Atrésico, o qual foi observado em amostras obtidas de fêmeas de suruvi em maturação e maduras.

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      Revision of genus Steindachneridion (Siluriformes: Pimelodidae)

      After several years collecting in the type-localities and studying representative samples of genus Steindachneridion Eigenmann & Eigenmann, 1919 from Brazilian and foreign museums, a taxonomic revision of the Recent species of the genus is presented, including the description of a new species from the rio Iguaçu, above the great falls. Steindachneridion species are large sized fishes, reaching 1000 mm total length or more, and sharing some anatomical characters that, at least tentatively, support the monophyly of the genus. In addition to the general features found in the Pimelodidae, the species S. amblyurum (Eigenmann & Eigenmann, 1888), S. parahybae (Steindachner, 1877), S. doceanum (Eigenmann & Eigenmann, 1889), S. scriptum (Miranda Ribeiro, 1918), S. punctatum (Miranda Ribeiro, 1918), and S. melanodermatum, new species, share the shape of the vomer tooth plates, six to eight branched rays in the dorsal-fin, and a low number of gill-rakers. All species, except fossil ones, are redescribed and a key for their identification is provided.
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        Follicular atresia in the ovaries of nonmammalian vertebrates.

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          Ovarian follicular atresia in two teleost species: a histological and ultrastructural study.

          Follicular atresia is a common phenomenon in vertebrate ovaries involving the oocyte and the follicular wall degeneration. Female Astyanax bimaculatus lacustris and Leporinus reinhardti were kept in aquaculture cages inside tanks from February 1994 to January 1995 for the study of the characteristics of different stages of follicular atresia. Histological and ultrastructural analysis demonstrated similarities in the degenerative events and in the resorption of oocytes in both species. Degradation of organelles, such as mitochondria, cortical alveoli, and annulate lamellae occurred in the peripheral ooplasm during the initial stage of the process. Follicle cells showed marked phagocytic activity with digestive vacuoles, myelin figures, and lipofuscin granules during the intermediate and advanced stages of follicular atresia. Granulocytes were in activity during the final stage of follicle resorption. The duration of follicular atresia was 4 months in Leporinus reinhardti and 7 months in Astyanax bimaculatus lacustris. When submitted to induced reproduction in December 1995, 50-60% of the females of both species responded to induced spawning, indicating the recovery of gonadal activity. It is suggested that, in captive conditions, follicular atresia is shorter in total-spawning fishes when compared to those showing partial spawning, and that it has no apparent deleterious effects on induced reproduction in the subsequent cycle.
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            Author and article information

            Affiliations
            [1 ] Universidade Federal de Santa Catarina Brazil
            [2 ] Universidade Federal de Santa Catarina Brazil
            [3 ] Universidade Federal de Santa Catarina Brazil
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Journal
            asas
            Acta Scientiarum. Animal Sciences
            Acta Sci., Anim. Sci.
            Editora da Universidade Estadual de Maringá - EDUEM (Maringá )
            1807-8672
            December 2015
            : 37
            : 4
            : 351-356
            S1807-86722015000400351
            10.4025/actascianimsci.v37i4.27570

            http://creativecommons.org/licenses/by/4.0/

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            Product Information: SciELO Brazil
            Categories
            VETERINARY SCIENCES

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