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Diseases of Aquatic Organisms

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DAO 45:77-80 (2001)  -  doi:10.3354/dao045077

Hyperventilation and loss of hemolymph Na+ and Cl- in the freshwater amphipod Gammarus fossarum exposed to acid stress: a preliminary study

V. Felten, F. Guerold*

Laboratoire EBSE, Equipe de Production des Ecosystèmes et Ecotoxicologie, Université de Metz, Boulevard du Général Délestraint, 57070 Metz, France
*Corresponding author. E-mail:

ABSTRACT: The effect of acidification on the acid-sensitive species Gammarus fossarum was investigated in the laboratory. The results showed that as mortality increased, mean hemolymph chloride and sodium concentrations decreased rapidly. Concomitantly, organisms hyperventilated during the first 24 h and then started to hypoventilate. These results demonstrated that exposure to acid stress in the acid-sensitive species G. fossarum led to ion-regulatory and respiratory failure as previously reported in fish and crayfish exposed to acid stress.

KEY WORDS: Gammarus fossarum · Acidic stress · Survival · Ion loss · Pleopod beats

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