Ultrastructure of the germ cells in the testis of matrinxã, Brycon cephalus (Teleostei, Characidae)

Romagosa, Elizabeth; Narahara, Massuka Yamane; Borella, Maria Inês; Parreira, S.F.; Fenerich-Verani, Nelsy

doi:10.1054/tice.1999.0064

Cited by 35 publications

(56 citation statements)

References 8 publications

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“…This pattern differs from some teleosteans (e.g., blenniid), in which various germ cells developing from spermatocytes into spermatids are released from the germinal cysts into lobules or tubules of the lumina, and these released germs cells are not synchronously differentiated, characterizing the semi-cystic type (Lahnsteiner & Patzner, 1990a;1990b). Overall, O. hepsetus testes are very similar to other oviparous species of the Characidae family, such as the Brycon cephalus described by Romagosa et al (1999) and Bryconops affinis reported by Andrade et al (2001), which show secretory activity during spermatogenesis. This suggests similar reproductive tactics which probably enable these fish to adapt to and/or occupy the most diverse habitats (Winemiller, 1989).…”

Section: Discussionmentioning

confidence: 87%

Testicular maturation of Oligosarcus hepsetus (Cuvier) (Actinopterygii, Characidae) in a brazilian tropical reservoir

et al. 2006

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Six reproductive classes of male Oligosarcus hepsetus (Cuvier, 1829), a medium-sized carnivorous Characiform species, are described based on macroscopic and histological techniques. A total of 175 individuals were caught monthly between April 2001 and June 2002 in the Lajes Reservoir, Brazil, one of the largest impoundment areas in the state of Rio de Janeiro. The reproductive classes were based upon changes in the testicular morphology and stages of germinative cells, i.e., resting, early maturing, late maturing, mature, partially spent and totally spent. Fish in the resting class showed testes with spermatogonia and spermatocytes along the wall of seminal lobules, while spermatids were present in the lumina of the lobules. During early maturing, active spermatogenesis occurs throughout the testis; in the late maturing and mature classes, the lobules are swollen with sperm that are typical of fish in breeding condition. Spent testes presented seminal lobules with residual spermatozoa, coinciding with decreasing GSI and greatly reduced sperm production. Overall, the testicular morphology and class of maturity development of O. hepsetus in the Lajes reservoir did not differ significantly from those of closely related species in other lentic environments. Lower GSI values in the oligotrophic Lajes reservoir than in other eutrophic natural lakes suggest that this species may be modifying this aspect of its reproductive strategy in response to the artificial environment.Keywords: Characiforms, reproduction, reservoirs, spermatogenesis, testis. RESUMO Maturação testicular de

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Section: Discussionmentioning

confidence: 87%

Testicular maturation of Oligosarcus hepsetus (Cuvier) (Actinopterygii, Characidae) in a brazilian tropical reservoir

et al. 2006

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“…They are differentiated by the floccus of chromatin smallest and thinnest, by the midpiece and cytoplasmic sleeve shape and length of the last genus. Those of the genus Piaractus (Cruz-Landim et al, 2003; current paper) are quite distinct, and have a great similarity with the spermatozoa of the genera Salminus and Brycon (Aires et al, 2000;Romagosa et al, 1999;Zaiden, 2000;Veríssimo-Silveira et al, 2006). The type of chromatin condensation in floccus, the ovoid shape of the nucleus, the length of the midpiece, the mitochondria shape and distribution, and the presence of a well defined cytoplasmic sleeve response by this similarity.…”

Section: Discussionmentioning

confidence: 80%

“…In this case, the flagellum is eccentric to the nuclear axis, and the spermatozoa are of an intermediate type between types I and II (Mattei, 1970). Among the external fertilizing Characiformes, spermatozoa of the type I is the dominant type (Jamieson, 1991;Matos et al, 1993Matos et al, , 1998Burns et al, 1998;Magalhães, 1998;Romagosa et al, 1999;Aires et al, 2000;Zaiden, 2000;Andrade et al, 2001;Quagio-Grassiotto et al, 2001aAmaral, 2003;Cruz-Landim et al, 2003;Pecio, 2003;Azevedo, 2004;Weitzman et al, 2005;Veríssimo-Silveira et al, 2006;Oliveira, 2007;Pecio et al, 2007;Veríssimo-Silveira, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…In the serrasalmine spermatozoa (Matos et al, 1993;Cruz-Landim et al, 2003; current paper) the nucleus is occupied by large floccus of fibrous chromatin. Among the Characiformes this kind of chromatin condensation has been described for Citharinus sp., Citharinidae (Mattei et al, 1995), in Leporinus friderici, Leporinus macrocephalus, Leporinus lacustris, and Abramites sp., Anostomidae (Matos et al, 1999;Amaral, 2003;Veríssimo-Silveira, 2007, respectively), in Prochilodus lineatus, Prochilodontidae (Vicentini et al, 2001;Veríssimo-Silveira, 2007), in Rhaphiodon vulpinus Cynodontidae (Veríssimo-Silveira, 2007), in the characid genera Salminus (Veríssimo-Silveira et al, 2006) and Brycon (Aires et al, 2000;Romagosa et al, 1999;Zaiden, 2000;Veríssimo-Silveira et al, 2006), and in Alestes dentex, a relatively basal genus within the Alestidae (Shahin, 2006). Interestingly, in Micralestes sp.…”

Section: Discussionmentioning

confidence: 99%

“…Spermiogenesis and spermatozoa types, organell distribution and other particularities of the spermatic structure, have been found to be highly conservative in a given lineage at family or subfamily level, making them useful for phylogenetic analysis (Baccetti et al, 1984;Jamieson, 1991;Mattei, 1991;Burns et al, 1998;Quagio-Grassiotto et al, 2003). Regarding the Characiformes, and particularly the Characidae, the available information is still scarce considering the large diversity of the group (Jamieson, 1991;Matos et al, 1993Matos et al, , 1998Matos et al, , 2000Burns et al, 1998;Magalhães, 1998;Pecio & Rafinski, 1999;Romagosa et al, 1999;Aires et al, 2000;Zaiden, 2000;Andrade et al, 2001;Quagio-Grassiotto et al, 2001aAmaral, 2003;Cruz-Landim et al, 2003;Pecio, 2003;Azevedo, 2004;Pecio et al, 2005Pecio et al, , 2007Weitzman et al, 2005;Veríssimo-Silveira et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Spermiogenesis and spermatozoa ultrastructure in the Serrasalminae (Ostariophysi: Characiformes) with further evidence on the relationships of the piranhas and pacus

et al. 2009

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Spermatozoa and spermiogenesis ultrastructure were studied in the serrasalmine species Piaractus mesopotamicus, Mylossoma duriventre, Serrasalmus maculatus, and Metynnis mola and two distinct patterns may be recognized: the first common to Mylossoma, Serrasalmus and Metynnis, and the other, characteristic of Piaractus. The latter pattern is more similar to the conditions found in Salminus and Brycon. On the other hand, serrasalmine spermatozoa also share characteristics with the spermatozoa of species of the superfamily Anostomoidea. The phylogenetic significance of these characters is discussed.A ultraestrutura dos espermatozoides e espermiogênese foram estudadas nas espécies Piaractus mesopotamicus, Mylossoma duriventre, Serrasalmus maculatus e Metynnis mola de Serrasalminae, sendo dois padrões distintos reconhecidos: um comum a Mylossoma, Serrasalmus e Metynnis, e o segundo característico de Piaractus. Este último é mais similar ao observado em Salminus e Brycon. Por outro lado, o espermatozoide dos serrasalmíneos compartilha algumas características com espécies da superfamília Anostomoidea. O significado filogenético destes caracteres é discutido.

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Sperm and spermatozeugma ultrastructure in the inseminating speciesTyttocharax cochui,T. tambopatensis, andScopaeocharax rhinodus (Pisces: Teleostei: Characidae: Glandulocaudinae: Xenurobryconini)

2004

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This article presents the scanning and transmission electron microscopy of the spermatozoa and sperm packets of three inseminating species of the glandulocaudine tribe Xenurobryconini. All three species, Scopaeocharax rhinodus, Tyttocharax cochui, and T. tambopatensis produce unencapsulated sperm packets (= spermatozeugmata) of similar morphology. The external anterior surface of each spermatozeugma is comprised of elongate sperm heads arranged in parallel, and the posterior part is made up of tightly packed flagella. The interior of the anterior portion consists of alternating layers of sperm heads and flagella. The remarkable integrity of each packet appears to be maintained through an electron-dense secretion seen among all parts of the cells. Spermatozeugma formation takes place within the spermatocysts at the end of spermiogenesis and at spermiation fully formed packets are released. Morphology of the mature spermatozoa was similar in all three species. Each nucleus is elongate, flattened along most of its length, and tapers at either end. The two centrioles are nearly parallel to one another and are located just anterior to the nucleus. Elongate mitochondria are located along the nucleus. The single flagellum, which lacks axonemal fins, is initially contained within a short cytoplasmic collar. Accessory microtubules run parallel to the long axis of the nucleus just beneath the plasma membrane. During spermiogenesis, no nuclear rotation occurs and the cytoplasmic canal containing the flagellum elongates along with the nucleus. However, prior to spermiation all but the anterior portion of the collar degenerates. The sperm modifications observed in these species are discussed as adaptations to the unique reproductive habit of insemination.

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Ultrastructure of the germ cells in the testis of matrinxã, Brycon cephalus (Teleostei, Characidae)

Cited by 35 publications

References 8 publications

Testicular maturation of Oligosarcus hepsetus (Cuvier) (Actinopterygii, Characidae) in a brazilian tropical reservoir

Testicular maturation of Oligosarcus hepsetus (Cuvier) (Actinopterygii, Characidae) in a brazilian tropical reservoir

Spermiogenesis and spermatozoa ultrastructure in the Serrasalminae (Ostariophysi: Characiformes) with further evidence on the relationships of the piranhas and pacus

Sperm and spermatozeugma ultrastructure in the inseminating speciesTyttocharax cochui,T. tambopatensis, andScopaeocharax rhinodus (Pisces: Teleostei: Characidae: Glandulocaudinae: Xenurobryconini)

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