Air breathing of aquatic burrow-dwelling eel goby, Odontamblyopus lacepedii (Gobiidae: Amblyopinae)

The Journal of Experimental Biology
Tomas T GonzalesAtsushi Ishimatsu

Abstract

Odontamblyopus lacepedii is an eel goby that inhabits both coastal waters and intertidal zones in East Asia, including Japan. The fish excavates burrows in mudflats but, unlike the sympatric amphibious mudskippers, it does not emerge but stays in the burrows filled with hypoxic water during low tide. Endoscopic observations of the field burrows demonstrated that the fish breathed air in the burrow opening; air breathing commenced 1.3 h following burrow emersion, when water P(O2) was approximately 2.8 kPa, with an air-breathing frequency (f(AB)) of 7.3+/-2.9 breaths h(-1) (mean +/- s.d., N=5). Laboratory experiments revealed that the fish is a facultative air breather. It never breathed air in normoxic water (P(O2)=20.7 kPa) but started bimodal respiration when water P(O2) was reduced to 1.0-3.1 kPa. The fish held air inside the mouth and probably used the gills as gas-exchange surfaces since no rich vascularization occurred in the mouth linings. As is known for other air-breathing fishes, f(AB) increased with decreasing water P(O2). Both buccal gas volume (V(B)) and inspired volume (V(I)) were significantly correlated with body mass (M(b)). At a given M(b), V(I) was nearly always equal to V(B), implying almost complete buccal g...Continue Reading

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Citations

Jun 28, 2011·Integrative and Comparative Biology·Atsushi Ishimatsu, Jeffrey B Graham
Feb 20, 2013·Respiratory Physiology & Neurobiology·Jacopo P Mortola, Peter B Frappell
Mar 4, 2011·Journal of Fish Biology·A ChakonaK Magellan
Feb 8, 2014·Journal of Fish Biology·K MagellanE R Swartz
Dec 19, 2013·Journal of Fish Biology·K L Martin
Nov 6, 2007·The Journal of Experimental Biology·Atsushi IshimatsuJeffrey B Graham

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