Acentrogobius dayi, also known as Day's goby, is a species of goby found in the western Indian Ocean from the Persian Gulf to Pakistan.Myers, R.F., 1991. Micronesian reef fishes. Second Ed. Coral Graphics, Barrigada, Guam. 298 p. It is also found in brackish and freshwater streams of south-western Asia.
Description This species reaches a length of .
Etymology The fish is named in honor of Francis Day (1829-1889), the Inspector-General of Fisheries in India,
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