Programa de Pós-Graduação em Zoologia - PPGZOOL/ICB

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2343

O Programa de Pós-Graduação em Zoologia (PPGZOOL) do Instituto de Ciências Biológicas (ICB) foi consolidado como um convênio entre Universidade Federal do Pará (UFPA) e Museu Paraense Emílio Goeldi (MPEG).

Navegar

Navegando Programa de Pós-Graduação em Zoologia - PPGZOOL/ICB por Autor "ASSUNÇÃO, Maria Ivaneide da Silva"

Filtrar resultados informando as primeiras letras
Agora exibindo 1 - 1 de 1
  • Imagem de Miniatura
    ItemAcesso aberto (Open Access)
    Pesca, alimentação e ecologia reprodutiva e embrionária de carataí (Pseudauchenipterus nodosus) (Siluriformes, Auchenipteridae) no rio Marapanim, Marapanim, Pará
    (Universidade Federal do Pará, 2000-10) ASSUNÇÃO, Maria Ivaneide da Silva; BARTHEM, Ronaldo Borges; http://lattes.cnpq.br/4192105831997326
    This study presents information on the fisheries, diet, reproduction and embryonic development of carataí fish, Pseudauchenipterus nodosus (Siluriformes, Auchenipteridae), based on data collected between December 1998 and April 1999 in Marapanim River, Pará State, Brazil. Daily and biweekly samplings were collected by means of weirs and pound nets at four sites along the river: the bay, the estuarine funnel, mid-river and the upper portion. It was confirmed that fishing took place during the reproductive period of the species, and that its features varied according to the different sites. Most of the fishermen’s yield was sold in neighboring districts. Catch data along the river pointed the upper portion (33%) and mid-river (44%) as the most productive sites and indicated that carataí performs a biweekly ascending movement. The species ingested larger amounts of food in turbid waters, mainly in tide streams: its diet included annelids, arthropods, mollusks and fishes. Local observations and frequency distributions of ovaries at mature, reproductive and spent stages respectively indicated that carataí spawns in places with fresh and clean waters, on river and creek shores, under a canopy of undisturbed forests. Spawning occurred during the last peaks of the highest waters of spring tides, and following their retraction the eggs were incubated in the soil for about 11 days until the coming syzygy, under temperatures of 22 to 27.5 °C. After hatching, the embryos either remained enclosed within the egg shell until flooded by the tide, or got out of the shell and onto the ground, where they could survive for a couple of hours. Those latter embryos had the ability of taking up exogenous food as they hatched, while those incubated in water would tend to hatch prematurely and show little perception of the surrounding environment. Intervention in the annual recruitment of carataí in Marapanim River seemed to be more dependent on local rain distribution and on the integrity of the forest than on fishing activities.
Logo do RepositórioLogo do Repositório