Effects of Water Flow and Hypoxia on Respiration of the Frogfishes, <I>Histrio histrio and Phrynelox tridens</I>
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Effects of water flow rate and lowering the dissolved oxygen in ambient water on the respiration of the frogfishes, Histrio histrio and Phrynelox tridens, were investigated using con-tinuous flow respirometry. Resting V<SUB>O2</SUB> of isolated fish of both species did not increase with increase in flow rate through the respirometer tube, whereas the percentage of oxygen removed from that water decreased. With increasing flow rate the ventilatory frequency rose in <I>P. tridens</I>, but not in <I>H. histrio</I>. These differences are probably related to differences in the habitat of each species. Both the percentage of oxygen removal and ventilatory frequency in each species in-creased with decrease in the oxygen content in ambient water. V<SUB>O2</SUB> did not change in <I>H. histrio</I> but increased with a decrease in water oxygen content in <I>P. tridens</I>. It is suggested that lowering of oxygen in the inspired water leads to compensatory responses in which the oxygen consump-tion of the fish during hypoxia is maintained in <I>H. histrio</I> or increased in <I>P. tridens</I> as a result of a rise in proportion of oxygen removed and elevated ventilatory frequency.
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