Morphologic analysis of developmental phases and gill ontogenesis in neotropical species Poecilia vivipara (Cyprinodontiformes: Poeciliidae) exposed to different salinities
Carregando...
Data
2010-08
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
The present study evaluated and characterized the different phases of development and the cell types present
in the gill epithelium of embryos, larvae, and fingerlings of guppy (Poecilia vivipara Bloch & Schneider, 1801) specimens
exposed to water with salinity ranging from 0‰ to 20‰. The development of P. vivipara was classified into eight phases.
The yolk was intensely eosinophilic, with glycidic and lipidic components between phases 1 to 7. After the development of
their branchial epithelium, the presence of pavement cells, mitochondria-rich cells, and mucous cells (MCs) was observed.
The understanding of ontogenesis indicates the sequence of cellular origin. Only type IV MCs located in the gill rays was
detected from phase 3 through phase 7. Other types of MCs were observed only when the fingerlings were exposed to
salinity changes and showed to be lectin-reactive, thus indicating that P. vivipara modulates the cellular behavior when
submitted to salinity changes. Exposure to variable saline concentrations did not interfere in the initial development of
guppies. The presence of a yolk sac until the fingerling phase characterized this species as ovoviviparous.
Descrição
Palavras-chave
Developmental biology, Euryhalinity, Guppy, Mucous cells, Teleosts
Citação
ROCHA, Thiago L.; CARVALHO, Rodolfo; YAMADA, Áureo T.; SABÓIA-MORAIS, Simone M. T. Morphologic analysis of developmental phases and gill ontogenesis in neotropical species Poecilia vivipara (Cyprinodontiformes: Poeciliidae) exposed to different salinities. Zoologia, Curitiba, v. 27, n. 4, p. 554-562, Aug. 2010.