Abstract

VALBUENA, Mónica; VELASCO-SANTAMARIA, Yohana M  and  CRUZ-CASALLAS, Pablo E. Effects of the body weight on the routine oxygen consumption of yamú (Brycon amazonicus): preliminary report. Rev Colom Cienc Pecua [online]. 2006, vol.19, n.2, pp.175-179. ISSN 0120-0690.

With the aim to evaluate the effects of the body weight on the oxygen consumption in yamú (Brycon amazonicus), fish of 100, 200, 400, 800 and 1600 g of body weight were maintained in a respirometer with a capacity of 172 L and the oxygen consumption was register each 5 min during 2 to 4 h, using a multi-probe system YSI 556. The water temperature was maintained at 28 ± 1°C. The results showed an inverse relationship between the oxygen consumption and the body weight, because the animals of smaller size registered a higher oxygen consumption for unit of body weight than those of superior size. This relationship generated the following regression equation: Y= 583.7 - 64.9 Ln(X), where Y is the oxygen consumption in mg.kg-1.h-1 and Ln(X) the natural logarithm of the corporal weight expressed as grams (r2= 0.92, n= 5).

Keywords : oxygen consumption; respirometer; tropical fishes; yamú.

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