Development and early differentiation of gonad in the european eel (Anguilla anguilla [L.], Anguilliformes, Teleostei): A cytological and ultrastructural study

Journal of Morphology
Gilberto Grandi, Giuseppe Colombo

Abstract

The structure of the gonad of the European eel (Anguilla anguilla [L.]), an "undifferentiated" gonochoristic teleost, was investigated by transmission electron microscopy from 6-8 cm elvers to 22 cm yellow eels with juvenile hermaphroditic gonads. The pear-shaped gonads of 6-8 cm elvers assume, in 12-15 cm eels, a lamellar shape and enlarge by migration of germ cells, which we refer to as primary primordial germ cells. In the gonads of ∼ 16 cm eels, the primary primordial germ cells multiply, giving rise to clusters of germ cells that have ultrastructural characteristics of the primary primordial germ cells but show giant mitochondria, enlarged Golgi complexes, and round bodies not limited by membranes. We refer to these as secondary primordial germ cells. In 16-18 cm eels, syncytial clones of oogonia interconnected by cytoplasmic bridges are also observed. In 18-22-cm-long eels, the gonads contain primordial germ cells, oogonial clones, early oocyte cysts, single oocytes in early growth stages, and primary spermatogonia. Such germ cells are present in the same cross section where they are either intermingled or are in areas of predominantly female germ cells close to areas with predominantly male germ cells. These gonads are j...Continue Reading

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Citations

Oct 19, 2012·Ecotoxicology·Silvia QuadroniRoberta Bettinetti
Jul 24, 2010·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Talita Sarah MazzoniIrani Quagio-Grassiotto
Apr 18, 2014·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Talita Sarah MazzoniIrani Quagio-Grassiotto
Apr 29, 2004·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·Rosanna FalconiFrancesco Zaccanti
Jul 13, 2016·Journal of Fish Biology·F N ValentinL S O Nakaghi

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