Mugilogobius is a genus of small gobies (family Gobiidae) spread across fresh, brackish and estuarine water of the Indo-Pacific, recorded in the atlas from Indonesia, Malaysia, the Philippines, Thailand, Australia, Japan, Papua New Guinea and Vietnam. Like most gobies they are bottom-dwelling fish with fused pelvic fins forming a suction disc, and they lack a lateral line running the length of the body, relying instead on close contact with the substrate to sense their surroundings. The atlas covers 9 species, from about 1–5.5 in, and the genus spans both widespread coastal species and highly localized lake endemics.
The clearest case of the latter is Mugilogobius amadi, the Lake Poso goby, restricted to Sulawesi's ancient Lake Poso — one of Indonesia's biodiversity-rich but ecologically fragile ancient lakes, where introduced predatory fish have driven declines in several native lineages; it is the genus's sole Critically Endangered entry in the atlas. The rest of the genus sits mostly outside mainstream fishkeeping, of more interest to biotope and brackish-species specialists than to general aquarists, with care needs that track each species' natural salinity — small, peaceful, bottom-oriented fish kept in brackish or fresh setups depending on origin. Conservation data remain incomplete for much of the genus: five of the nine species the atlas tracks are Not Evaluated, alongside three Least Concern and the one Critically Endangered species.