A novel oxyconforming response in the freshwater fish Galaxias maculatus

Urbina, M.A.; Glover C.N.; Forster M.E.

Abstract

How fish oxygen consumption is modulated by external PO 2 has long been a matter of interest, yet is an experimentally complicated question to answer. In this study closed and semi-closed respirometry were used to evaluate the oxygen consumption rate of the scaleless galaxiid fish, inanga (Galaxias maculatus) as a function of decreasing external PO 2. Both respirometry techniques showed that as environmental oxygen levels declined, oxygen consumption rates also decreased. At no point did inanga regulate oxygen consumption. This is strong evidence that inanga is an oxyconformer. Partitioned respirometry experiments showed that skin plays an important role in oxygen uptake in this fish species, and cutaneous oxygen uptake may have an important role in shaping the oxygen consumption response to hypoxia. © 2011 Elsevier Inc.

Más información

Título según SCOPUS: A novel oxyconforming response in the freshwater fish Galaxias maculatus
Título de la Revista: COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
Volumen: 161
Número: 3
Editorial: Elsevier Science Inc.
Fecha de publicación: 2012
Página de inicio: 301
Página final: 306
Idioma: English
DOI:

10.1016/j.cbpa.2011.11.011

Notas: SCOPUS