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Giora,Júlia; Fialho,Clarice B.; Dufech,Ana Paula S.. |
This study aims to describe the feeding habits of a population of the weakly electric fish Eigenmannia trilineata from Southern Brazil through the monthly frequency variation of replection (RI) and hepatosomatic (HSI) indexes, condition factor (CF) and dietary analysis of the species, besides the comparison of the results with abiotic factors. We collected 428 specimens from June/2002 to May/2003 with a dip net and electric fish detector. Stomach contents were analyzed using three measurements: frequency of occurrence of food items, percentage composition per prey type and feeding importance index. Microcrustacea and autochthonous insects were the dominant food items in the stomachs of E. trilineata. The adults (males larger than 63.5 mm and females larger... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gymnotiformes; Electric-fish; Diet; Southern Brazil. |
Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000200007 |
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Dufech,Ana Paula S.; Azevedo,Marco A.; Fialho,Clarice B.. |
The diet of two populations of Mimagoniates rheocharis, from two freshwater streams of the rio Tramandaí, northeastern Rio Grande do Sul, Brazil, are described and compared. The specimens were collected monthly from January 1998 to March 1999, with dip nets and seine nets and preserved in 10% formalin. In laboratory, the standard length of each specimen was measured. The stomachs were removed and dissected for identification of the alimentary items. The data were analyzed using the frequency of occurrence, percent composition and index of alimentary importance methods, being the last two compared among different classes of standard length. Three methods of analysis showed the highest values for allochthonous insects, regardless the locality of collection... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Feeding; Allochthonous insects; Rio Maquiné; Diet; Neotropical. |
Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252003000100008 |
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