Macrognathus semiocellatus

{{Short description|Species of fish}}

{{Speciesbox

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Vidthayanon, C. |date=2012 |title=Macrognathus semiocellatus |volume=2012 |page=e.T180795A1663439 |doi=10.2305/IUCN.UK.2012-1.RLTS.T180795A1663439.en |access-date=20 November 2021}}

| taxon = Macrognathus semiocellatus

| authority = (Fowler, 1935)

| synonyms = Mastacembelus pentophthalmos Gronow, 1854

| synonyms_ref =

}}

Macrognathus semiocellatus is a species of ray-finned fish endemic to Cambodia, Laos and Vietnam; it found in marshlands and vegetated water bodies in Mekong Chao Phraya River and Mae Klong.{{Fishbase|Macrognathus|semiocellatus|month=August|year=2019}} It spends its time during the day buried in silt, sand or fine gravel and forages at night for benthic insect larvae, crustaceans and worms.{{cite book |last=Rainboth |first=Walter J. |date=1996 |title=Fishes of the Cambodian Mekong |url=https://archive.org/details/bub_gb_sZQbV75rtAQC |quote=Macrognathus semiocellatus. |publisher=Food and Agriculture Organization |page=[https://archive.org/details/bub_gb_sZQbV75rtAQC/page/n190 179] |isbn=9251037434 |access-date=June 5, 2015}}

It is listed as Least Concern as it is locally and seasonally common and its threats are not significant and there is no need for conservation protection; the threats are pollution and wetland removal. It is seen aquariums and is also fished and exported from Cambodia to Thailand and other countries.