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Reproductive Biology of the Neotropical Superfetaceous Pamphorichthys Hollandi (Cyprinodontiformes: Poeciliidae)

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Reproductive Biology of the Neotropical Superfetaceous Pamphorichthys Hollandi (Cyprinodontiformes: Poeciliidae) 59 Ichthyol. Explor. Freshwaters, Vol. 17, No. 1, pp. 59-64, 5 fi gs., 1 tab., March 2006 © 2006 by Verlag Dr. Friedrich Pfeil, München, Germany – ISSN 0936-9902 Reproductive biology of the neotropical superfetaceous Pamphorichthys hollandi (Cyprinodontiformes: Poeciliidae) Lilian Casatti*, Fernando R. Carvalho*, José L. Veronezi Jr.* and Daniel R. Lacerda* We investigated sex ratio, reproductive period, fecundity, and sexual dimorphism of Pamphorichthys hollandi in southeastern Brazil. Reproductive status was identifi ed according to a female’s gonads/embryos development scale. Of the 613 collected specimens, 373 (60 %) were females and 240 (40 %) males giving a sex ratio of 1 male : 1.6 female. Sexual dimorphism was evident in respect to body size, body coloration, and anal and pelvic-fi n mor- phologies. The highest proportion of reproductive females was registered in January and February, which rep- resent wet and hot periods. The simultaneous presence of more than one litter at different stages of development within a single female characterized this species as superfetaceous. No presente estudo investigamos a razão sexual, período reprodutivo, fecundidade e dimorfi smo sexual de Pamphorichthys hollandi no sudeste do Brasil. Os estágios reprodutivos foram identifi cados com base em uma escala de desenvolvimento das gônadas/embriões. Dos 613 indivíduos coletados, 373 (60 %) eram fêmeas e 240 (40 %) machos, dando uma razão sexual de 1 macho : 1,6 fêmea. O dimorfi smo sexual foi evidente em relação ao tamanho corporal, coloração do corpo e morfologia das nadadeiras pélvica e anal. A maior incidência de fêmeas reprodutivas ocorreu em janeiro e fevereiro, que correspondem a períodos úmidos e quentes. A presença simul- tânea de embriões em diferentes estágios de desenvolvimento na mesma fêmea caracteriza essa espécie como superfetadora. Introduction Poeciliidae is considered a virtually unknown family to basic natural history (Meffe & Snelson, Poeciliidae includes well-known aquarium fi shes 1988). such as the guppies, mosquito fi shes, swordtails, Poeciliinae is the most specious subfamily platys, and mollies, occupying fresh and brackish within Poeciliidae, with about 220 valid species, waters of America and Africa (Lucinda, 2003). broadly distributed throughout the Americas Mosquitofi shes (Gambusia species) are the best (Lucinda, 2003). Pamphorichthys is a South Amer- known poeciliid due to widespread stocking as ican Poeciliinae with fi ve species distributed along mosquito control. Despite some existent data Amazonas, Araguaia, Tocantins, Paraguay, and about species used in experimental biology (e.g., São Francisco river basins (Lucinda, 2003). Pam- species of Poecilia, Heterandria, and Poeciliopsis), phorichthys hollandi (Fig. 1) was considered to be * UNESP, Universidade Estadual Paulista, Laboratório de Ictiologia, Departamento de Zoologia e Botânica, Rua Cristóvão Colombo, 2265, 15054-000, São José do Rio Preto, SP, Brazil. E-mail: [email protected] Ichthyol. Explor. Freshwaters, Vol. 17, No. 1 The whole contribution can be Dieser Beitrag kann als purchased as PDF fi le. PDF-Datei erworben werden. Availability Verfügbarkeit von PDF-Dateien Prinzipiell sind von allen unseren Publikationen PDF- Generally all our publications are available as PDF fi les; Dateien erhältlich. Komplette Publikationen in der Regel full publications as a general rule after the printed version erst nachdem die gedruckte Version vergriffen ist. An- is out of print. If you have questions concerning particu- fragen bezüglich bestimmter Beiträge richten Sie bitte lar contributions please contact us by e-mail: per E-Mail an [email protected]. 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