SciELO - Scientific Electronic Library Online

vol.51 issue3Impact of increasing water temperature on growth, photosynthetic efficiency, nutrient consumption, and potential toxicity of Amphidinium cf. carterae and Coolia monotis (Dinoflagellata)Oxytetracycline degrading fungi isolated from Chilean fjord sediments author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google


Revista de biología marina y oceanografía

On-line version ISSN 0718-1957


SAAVEDRA, Luisa M.; QUINONES, Renato A  and  GONZALEZ, Rodrigo R. Aerobic and anaerobic enzyme activity in the hake Merluccius gayi gayi related to the Oxygen Minimum Zone off central-southern Chile. Rev. biol. mar. oceanogr. [online]. 2016, vol.51, n.3, pp.581-590. ISSN 0718-1957.

The Humboldt Current System (HCS), off the coast of Chile, has an Oxygen Minimum Zone (OMZ) between 30 and 250 m depth, with oxygen concentrations < 0.5 ml L-1. Densities of Merluccius gayi gayi associated with this zone are highest between 100 and 300 m depth, suggesting metabolic adaptations allowing it to remain in the OMZ. The aerobic and anaerobic potential of this demersal fish was estimated through the measurement of key metabolic enzymes and the electron transport system (ETS) of different body tissues (white muscle, heart, brain and liver). The activities of the citrate synthase (CS) enzyme and the ETS were higher in the brain and lower in muscle, confirming the predominance of aerobic metabolism in vital organs, different of muscle. The typical activity of the anaerobic enzyme lactate dehydrogenase (LDH) fluctuated between 55 ± 17.5 and 263 ± 79 UI g-1 wet weight, with lower activities in heart and brain. The low LDH activity and high MDH/LDH ratio found in these vital organs indicate that they are able to cope with metabolic acidification during long periods of environmental hypoxia. Exceptionally high LDH activity was found in the liver which may be related to environmental factors such as pollution. Considering the low MDH/LDH ratio of muscle, the decreased activity of CS and ETS in this tissue and the high LDH activity in the liver may indicate metabolic profile of M. gayi gayi in order to tolerate hypoxia, and therefore the capability to stay in the OMZ by decreasing its swimming activity.

Keywords : Merluccius gayi gayi; minimum oxygen zone; enzymatic activity; hypoxia.

        · abstract in Spanish     · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License