Produção Nacional
Revisado por pares
Relações entre fatores ambientais e a distribuição de ovos e larvas de peixes na sub-bacia do rio Ivinhema, Estado de Mato Grosso do Sul, Brasil.
2006; Editora da Universidade Estadual de Maringá (Eduem); Volume: 28; Issue: 2 Linguagem: Inglês
10.4025/actascibiolsci.v28i2.1027
ISSN1807-863X
AutoresF. L. Nascimento, Keshyiu Nakatani,
Tópico(s)Aquaculture Nutrition and Growth
ResumoThe spatial and temporal distribution of fish eggs and larvae in the Ivinhema River Basin was analyzed. The aim was to determine the spawning areas and their relationship to environmental factors. Monthly collections were done from September, 1994, to February, 1995, in four sites: one in the Ivinhema River and three in different tributaries. Conic-cylindrical plankton net with 0.5 mm, coupled with a flow meter was used, and the samples were preserved in formol 4%. The abundance was standardized for 10 m3. Data related to water temperature, dissolved oxygen, pH, electric conductivity, and rainfall were also collected. Principal Components Analysis determined the correlation between the environmental variables and the ichthyoplankton density along each river stretch. 23,325 eggs and 16,012 larvae were collected. The density was higher during the rainy period. The spawning period coincided with high precipitation level and temperature (October to December), with higher densities on the collect stations of Dourados and Vacaria rivers, with relatively basic pH and low electric conductivity.
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