Feeding habit of Eigenmannia trilineata Lopez & Castello, 1966 (Teleostei: Sternopygidae) of Parque Estadual de Itapuã, RS, Brazil
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 co...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Ictiologia
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| Series: | Neotropical Ichthyology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000200007&lng=en&tlng=en |
| _version_ | 1818035478455123968 |
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| author | Júlia Giora Clarice B. Fialho Ana Paula S. Dufech |
| author_facet | Júlia Giora Clarice B. Fialho Ana Paula S. Dufech |
| author_sort | Júlia Giora |
| collection | DOAJ |
| description | 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 than 80.5 mm) exhibited little alteration in their diet during the reproductive period and ingested more variety of food items. The RI of males, but not females, showed peaks before and after the reproductive period, having significant correlation with the HSI. Condition factor was more influenced by stomach weight in males and by the gonad weight in females. No correlation between abiotic factors and feeding activity was identified. |
| first_indexed | 2024-12-10T06:55:42Z |
| format | Article |
| id | doaj.art-e0128b8c69a2401eb4472505fe13731b |
| institution | Directory Open Access Journal |
| issn | 1982-0224 |
| language | English |
| last_indexed | 2024-12-10T06:55:42Z |
| publisher | Sociedade Brasileira de Ictiologia |
| record_format | Article |
| series | Neotropical Ichthyology |
| spelling | doaj.art-e0128b8c69a2401eb4472505fe13731b2022-12-22T01:58:26ZengSociedade Brasileira de IctiologiaNeotropical Ichthyology1982-02243229129810.1590/S1679-62252005000200007S1679-62252005000200007Feeding habit of Eigenmannia trilineata Lopez & Castello, 1966 (Teleostei: Sternopygidae) of Parque Estadual de Itapuã, RS, BrazilJúlia Giora0Clarice B. Fialho1Ana Paula S. Dufech2Universidade Federal do Rio Grande do SulUniversidade Federal do Rio Grande do SulUniversidade Federal do Rio Grande do SulThis 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 than 80.5 mm) exhibited little alteration in their diet during the reproductive period and ingested more variety of food items. The RI of males, but not females, showed peaks before and after the reproductive period, having significant correlation with the HSI. Condition factor was more influenced by stomach weight in males and by the gonad weight in females. No correlation between abiotic factors and feeding activity was identified.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000200007&lng=en&tlng=enGymnotiformeselectric-fishdietsouthern Brazil |
| spellingShingle | Júlia Giora Clarice B. Fialho Ana Paula S. Dufech Feeding habit of Eigenmannia trilineata Lopez & Castello, 1966 (Teleostei: Sternopygidae) of Parque Estadual de Itapuã, RS, Brazil Neotropical Ichthyology Gymnotiformes electric-fish diet southern Brazil |
| title | Feeding habit of Eigenmannia trilineata Lopez & Castello, 1966 (Teleostei: Sternopygidae) of Parque Estadual de Itapuã, RS, Brazil |
| title_full | Feeding habit of Eigenmannia trilineata Lopez & Castello, 1966 (Teleostei: Sternopygidae) of Parque Estadual de Itapuã, RS, Brazil |
| title_fullStr | Feeding habit of Eigenmannia trilineata Lopez & Castello, 1966 (Teleostei: Sternopygidae) of Parque Estadual de Itapuã, RS, Brazil |
| title_full_unstemmed | Feeding habit of Eigenmannia trilineata Lopez & Castello, 1966 (Teleostei: Sternopygidae) of Parque Estadual de Itapuã, RS, Brazil |
| title_short | Feeding habit of Eigenmannia trilineata Lopez & Castello, 1966 (Teleostei: Sternopygidae) of Parque Estadual de Itapuã, RS, Brazil |
| title_sort | feeding habit of eigenmannia trilineata lopez castello 1966 teleostei sternopygidae of parque estadual de itapua rs brazil |
| topic | Gymnotiformes electric-fish diet southern Brazil |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000200007&lng=en&tlng=en |
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