TY - JOUR
T1 - Scaling effects on hypoxia tolerance in the Amazon fish Astronotus ocellatus (Perciformes
T2 - Cichlidae): Contribution of tissue enzyme levels
AU - Almeida-Val, V. M. F.
AU - Val, A. L.
AU - Duncan, W. P.
AU - Souza, F. C. A.
AU - Paula-Silva, M. N.
AU - Land, S.
PY - 2000/5/19
Y1 - 2000/5/19
N2 - Astronotus ocellatus is one of the most hypoxia tolerant fish of the Amazon; adult animals can tolerate up to 6 h of anoxia at 28°C. Changes in energy metabolism during growth have been reported in many fish species and may reflect the way organisms deal with environmental constraints. We have analyzed enzyme levels (lactate dehydrogenase, LDH: EC 1.1.1.27; and malate dehydrogenase, MDH: EC 1.1.1.37) in four different tissues (white muscle, heart, liver, and brain) from different-sized animals. Both enzymes correlate with body size, increasing the anaerobic potential positively with growth. To our knowledge, this is the first description of scaling effects on hypoxia tolerance and it is interesting to explore the fact that hypoxia survivorship increases due to combining effects of suppressing metabolic rates and increasing anaerobic power as fish grow. Copyright (C) 2000 Elsevier Science Inc.
AB - Astronotus ocellatus is one of the most hypoxia tolerant fish of the Amazon; adult animals can tolerate up to 6 h of anoxia at 28°C. Changes in energy metabolism during growth have been reported in many fish species and may reflect the way organisms deal with environmental constraints. We have analyzed enzyme levels (lactate dehydrogenase, LDH: EC 1.1.1.27; and malate dehydrogenase, MDH: EC 1.1.1.37) in four different tissues (white muscle, heart, liver, and brain) from different-sized animals. Both enzymes correlate with body size, increasing the anaerobic potential positively with growth. To our knowledge, this is the first description of scaling effects on hypoxia tolerance and it is interesting to explore the fact that hypoxia survivorship increases due to combining effects of suppressing metabolic rates and increasing anaerobic power as fish grow. Copyright (C) 2000 Elsevier Science Inc.
KW - Amazon basin
KW - Astronotus
KW - Cichlids
KW - Enzyme scaling
KW - Hypoxia survivorship
UR - http://www.scopus.com/inward/record.url?scp=0034020203&partnerID=8YFLogxK
U2 - 10.1016/S0305-0491(99)00172-8
DO - 10.1016/S0305-0491(99)00172-8
M3 - Article
C2 - 10817909
AN - SCOPUS:0034020203
SN - 0305-0491
VL - 125
SP - 219
EP - 226
JO - Comparative Biochemistry and Physiology - B Biochemistry and Molecular Biology
JF - Comparative Biochemistry and Physiology - B Biochemistry and Molecular Biology
IS - 2
ER -