325 



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Common Names p, 



Argentina: manduv6, manduvei, manduvf cabez6n , manduvf, mandubd, 

 manduvd, mandubi (Berg 1897, Pozzi 1945, Achenbach and Bonetto 1957d, 

 Ringuelet and Aramburu 1961, Ringuelet et al. 1967). Brazil: mandubi, mandube 

 bagre, mandi-leiteiro, palmito, fidalgo, bocudo (Goeldi 1898, Santos et al. 1984, 

 Godoy 1986). Uruguay: manduvd (Devincenzi and Teague 1942). Venezuela: 

 doncella, bagre zapato, chancletas (Mago-Leccia 1970, Novoa 1982, L. Nico, 

 personal communication). 



Ecology 



i 



v...'/ 



Devincenzi and Teague (1942) reported that the diet of A. brevifilis consisted 

 primarily of fishes and crustaceans, that the species was most common from 

 November to March, and that reproduction occurred in December and January in 

 the Rio Uruguay. Ringuelet (1967) repeated the information presented by 

 Devincenzi and Teague, and also noted that individuals in the Rio Parand reached 

 550 mm in length, 2.38 kg, and lived at least five years. . , 



Novoa and Ramos (1978) found that Ageneiosus sp. ( = brevifilis according to 

 their photograph), captured from the main channels of the Rio Orinoco, ranged in 

 size from 27 to 54 cm TL and fed predominately on smaller fishes, and that females 

 were gravid during June. - 



Reid (1983) discovered that juveniles of A. brevifilis, together with many 

 other fishes, associated with juveniles of the large pimelodids Pseudoplatystoma 

 tigrinum and P.fasciatum. I have not examined the material on which Reid based 

 his observations, but there is a significant possibility that they may have been or 



