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Respiratory responses to hypoxia in relation to mode of life of two erythrinid species ( Hoplias malabaricus and Hoplias lacerdae )
Author(s) -
Rantin F. T.,
Kalinin A. L.,
Glass M. L.,
Fernandes M. N.
Publication year - 1992
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1992.tb02708.x
Subject(s) - biology , hypoxia (environmental) , ecology , zoology , oxygen , organic chemistry , chemistry
Predominantly, Hoplias malabaricus inhabits stagnant O 2 poor environments, whereas Hoplias lacerdae occurs in well‐aerated streams. The present study evaluates the influence of mode of life on O 2 uptake and gill ventilation in equally‐sized (300 g) specimens of this genus at 25° C. Comparing the species, H. lacerdae was characterized by the highest O 2 uptake and gill ventilation combined with a relatively higher cost of breathing and a lower O 2 extraction. Both species substantially increased ventilation in response to hypoxia with the difference that H. malabaricus exclusively augmented tidal volume, whereas H. lacerdae also increased breathing frequency.