DAO 45:153-154 (2001)  -  doi:10.3354/dao045153

Karyomegaly in Baryancistrus sp. (Loricaridae) from Amazonian Brazil

I. Paperna1,*, D. Di Cave2

1Department of Animal Sciences, Faculty of Agriculture of the Hebrew University of Jerusalem, Rehovot 76 100, Israel
2Cattedra di Parassitologia, Dipartimento di Sanita¹ pubblica e Biologia Cellulare, Universita degli Studi di Roma ŒTor Vergata¹, Via Tor Vergata 135, 00133 Rome, Italy

ABSTRACT: Vesicular karyomegaly of the liver hepatocytes is described from Baryancistrus sp. (Loricaridae), in 3 out of 7 fish, collected from Rio Xingu in central Amazonian (neutral water) Brazil and kept about 2 wk in a holding facility fed with acid water (pH 5.0 to 5.5). Altered cells also occurred in the gill epithelium. The vesicles in the liver were shown to contain a periodic acid-Schiff (PAS)-positive substance or residue.

KEY WORDS: Vesicular karyomegaly · Hepatocytes · PAS-positive residue · Gill epithelium · Baryancistrus sp. · Loricaridae · Brazil

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