| Journal: | Acta scientiarum. Biological sciences |
| Database: | PERIÓDICA |
| System number: | 000433724 |
| ISSN: | 1679-9283 |
| Authors: | Galdioli, Eliana Maria1 Hayashi, Carmino2 Soares, Claudemir Martins1 Soares, Telma3 Wolff, Liu4 |
| Institutions: | 1Universidade Estadual de Maringa, Nucleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Maringa, Parana. Brasil 2Universidade Estadual de Maringa, Departamento de Biologia, Maringa, Parana. Brasil 3Secretaria Estadual de Educacao do Estado do Parana, Pinhais, Parana. Brasil 4Escola de Educacao Basica Alcuino Goncalo Vieira, Balneario Camboriu, Santa Catarina. Brasil |
| Year: | 2017 |
| Season: | Ene-Mar |
| Volumen: | 39 |
| Number: | 1 |
| Pages: | 35-43 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, descriptivo |
| English abstract | Aiming to study the changes in the diet of Astyanax altiparanae in the early developmental stages, in the presence of Eichhornia crassipes (EC) and Lemna sp. (LM), larvae of Astyanax altiparanae were stocked in eight tanks of 900 L (500 ind. tank-1), four with EC and four with LM covering 50% surface. Tanks were inoculated with plankton and received 3.0 g inorganic fertilizer (NPK-7:14:8) and 1.5 g every week. At every three days, three larvae were taken from each tank, fixed in 4% formaldehyde and grouped into four age classes (I: 6 to 12 days, II:15 to 21 days, III:24 to 30 days; IV:33 to 39 days). The analysis of dominance and frequency of occurrence (FO) of food items indicated that, at this stage, A. altiparanae is generalist. In class I, there was a greater dominance and FO of Lecane bulla and Alona sp. in digestive tracts in the presence of both EC and LM, respectively; and larvae started to consume larger organisms, such as Chironomidae, in other age classes with EC. In the presence of LM, Alona sp. was dominant in class II; Chironomidae, in class III and Centropyxis sp., in class IV. Diatoms have greater FO both in EC and in LM. In class III, with EC, Chironomidae had higher FO, as well as Arcella sp. and Scenedesmus spp. with LM. The highest FO in class IV was found for L. bulla and Scenedesmus spp., with EC and LM, respectively. It can be concluded that EC and LM influenced the diet of Astyanax altiparanae, with alterations according to the availability of organisms and increase in age |
| Portuguese abstract | Objetivou-se estudar mudanças da dieta nos estágios iniciais de desenvolvimento de Astyanax altiparanae, na presença de Eichhornia crassipes (EC) e Lemna sp. (LM). Larvas de Astyanax altiparanae foram estocadas em oito tanques de 900 L (500 ind. tanque-1), sendo quatro com EC e quatro com LM cobrindo 50% da superfície destes. Os tanques foram inoculados com plâncton e receberam 3,0 g de fertilizante inorgânico (NPK-7:14:8) e 1,5 g semanalmente. A cada três dias foram coletadas três larvas de cada tanque, fixadas em formol a 4% e agrupadas em quatro classes de idade (I: 6 a 12 dias, II: 15 a 21 dias, III: 24 a 30 dias e IV:33 a 39 dias). Relacionando a dominância e frequência de ocorrência (FO) dos itens alimentares verificou-se que, nesta fase, o A. altiparanae é generalista. Na classe I, houve maior dominância e FO de Lecane bulla e de Alona sp. nos tratos digestórios na presença de EC e LM, respectivamente, passando a consumir organismos maiores como Chironomidae nas demais classes com EC. Na presença de LM, Alonasp. foi dominante na classe II, Chironomidae na III e Centropyxis sp. na IV. As diatomáceas tiveram maior FO tanto em EC quanto em LM. Na classe III, com EC Chironomidae teve maior FO, assim como Arcellasp. e Scenedesmus spp. com LM. A maior FO na classe IV foi de L. bulla e Scenedesmus spp. com EC e LM, respectivamente. Concluiu-se que EC e LM influenciaram a dieta de A. altiparanae, alterando-a de acordo com a disponibilidade dos organismos e com o aumento da idade |
| Disciplines: | Biología |
| Keyword: | Peces, Nutrición animal, Larvas de peces, Desarrollo larvario, Espectro trófico, Ontogenia, Astyanax altiparanae, Characidae |
| Keyword: | Fish, Animal nutrition, Fish larvae, Larval development, Trophic spectrum, Ontogeny, Astyanax altiparanae, Characidae |
| Full text: | http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/32102/pdf |
