Author: Kner, 1866
FBname: Pacific blue eye
Comments: Occurs in clear, cool, fast-flowing streams and also brackish mangrove estuaries.  Inhabits tidal mangrove creeks or fringing coastal mangrove and around offshore islands.  Also common in clear, forest streams.  Water temperature varies between 15° and 28°C, with the lower end of the scale applicable during winter over the southernmost part of the range.  The pH fluctuates from 5.5-7.8 according to habitat conditions.  At least 15 geographical varieties have been recognized, but detailed morphological studies reveal there is only one species  (Ref. 44894).