IMIS

A new integrated search interface will become available in the next phase of marineinfo.org.
For the time being, please use IMIS to search available data

 

[ report an error in this record ]basket (1): add | show Print this page
one publication added to basket [15067]
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. (1989). Aquaculture: a biotechnology in progress: volume 1. European Aquaculture Society: Bredene. ISBN 90-71625-03-6. 1-592 pp., more
Available in  Author 
Document type: Conference paper
Keyword
    Marine/Coastal
Author  Top 
  • Saint-Paul, U.
Abstract
    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.
All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Author