Estudio Histológico de huevos ováricos partenogenéticos de Moina eugeniae, Olivier 1954

ELIAS, F. G.; CERVELLINI, P. M.; GARIBOTTI, E. J.; PICCOLO M. C.

BIOLOGIA ACUATICA

Instituto de Limnología “Dr. R. A. Ringuelet”

Año: 2009 vol. 26 p. 91 - 96

0326-1638

ABSTRACT. Moina eugeniae is one of the most abundant zooplankton species found in ponds and lakes in Buenos Aires Province. Its importance is due to the common use of cladocerans as food fish. The aim of the present study was to investigate the reproductive structures through histological techniques. Samples were taken with a plankton net (150 μm) from the Calderón lake (Buenos Aires) during Spring 2006. The specimens were anesthetized with CO2 “in situ” and fixed with formaldehyde 4%. Parthenogenetic females in different reproductive stages were selected to perform with them routine his-tological techniques. No males were identified during our study. The ovaries are pair, sa-cular and disposed dorsally in the body. The oocytes are polyedric with three different stages of maturation: previtellogenic (dense nuclear cromatine), vitellogenic (abundant yolk in cytoplasm and large granules of cromatine in the nucleous) and mature (abun-dant lipidic drops in cytoplasm). Many of the morphological features observed are simi-lar to those of Daphnia genus.