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Hypoxia tolerance of neotropical fish culture candidates
Saint-Paul, U. (1989). Hypoxia tolerance of neotropical fish culture candidates, in: De Pauw, N. et al. (Ed.) Aquaculture: a biotechnology in progress: volume 1. pp. 907-912
In: De Pauw, N. et al. (Ed.) (1989). Aquaculture: a biotechnology in progress: volume 1. European Aquaculture Society: Bredene, Belgium. ISBN 90-71625-03-6. 1-592 pp., more

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  • Saint-Paul, U.

    Diurnal 02-variations with periods of severe hypoxia (02<0.5mg.l-1 overnight frequently occur in tropical fish ponds. Both the neotropical herbivorous serrasalmids Colossoma spp. and the omnivorous characids Brycon spp. show excellent growth rates under these conditions. Ecological and experimental investigations demonstrate their extreme tolerance towards hypoxia because they are capable of utilizing the oxygen rich surface layer of the water for respiration. For this purpose an ecomorphosis has been developed, involving the formation of a dermal extension on the lower jaw. The physiological importance of the so called aquatic surface respiration (ASR) for the oxygen supply of the organism is demonstrated by blood gas analyses. The influence of 02 concentration on the activity and routine circadian 02 consumption is demonstrated for C. macropomum. Investigations on 02-induced migrations between the zone of macrophyte cover and the open water reveal the ability of C. macropomum to survive severe hypoxia beneath macrophyte cover. The importance of the hypoxia tolerance for pond management is discussed.

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