Influence of Cadmium on the Respiratory Function of the Grass Carp Ctenopharyngodon idella

Authors: Espina S.¹; Salibian A.²; Díaz F.³

Source: Water, Air, and Soil Pollution, Volume 119, Numbers 1-4, April 2000 , pp. 1-10(10)

Publisher: Springer

Abstract:

The effect of 96 h exposure to sublethal cadmium concentrations on oxygen consumption rate (VO_2 mg h^-1) and oxygen extraction efficiency (OEE %) was determined in juvenile Ctenopharyngodon idella acclimated to 26, 29 and 32 °C for at least two weeks. The relationships among the physiological rates (VO_2 and OEE, body weight and temperature, were fitted by second order polynomial models; the response surfaces generated allowed the evaluation of stress induced by the interaction of those variables. Both VO_2 and OEE invariably increased as temperature increased. In small animals kept in 0.5 mg Cd L^-1, the VO_2 increase was compensated by a proportional increase in OEE, whereas in larger fishes (>1 g) no compensatory response was observed. Both small and large fishes were unable to compensate for a higher VO_2 when exposed to higher cadmium concentration. It is concluded that OEE in young fish is an early response of stress due to sublethal cadmium exposure.

Keywords: cadmium; Ctenopharyngodon idella; respiratory function; surface response

Language: English

Document Type: Regular paper

Affiliations: 1: Laboratorio de Ecofisiología, Departmento de Biología, Facultad de Ciencias, Universidad Nacional Autonoma de México, D.F. 04510, México 2: Programa de Ecofisiología Aplicada, Departmento de Ciencias Basicas, Universidad Nacional de Luján, 6700-Luján, Argentina 3: Departmento de Acuicultura, Centro de Investigación Científica y de Educación Superior de Ensenada, Kilómetro 107 Carretera Tijuana-Ensenada, Baja California, México (Correspondence address: Department of Aquaculture (CICESE), P.O. Box 434844, San Diego, CA 92143-4844, U.S.A., e-mail: fdiaz@cicese.mx)

Publication date: 2000-04-01

• In this: publication
• By this: publisher
• In this Subject: Hydraulic & Environmental Engineering
• By this author: Espina S. ;  Salibian A. ;  Díaz F.

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