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  • Hisonotus aky
  • Hisonotus aky
  • Hisonotus akyVideo
  • Hisonotus akyMale
  • Hisonotus akyFemale
  • Hisonotus aky
  • Hisonotus aky
  • Hisonotus aky
  • Hisonotus akyPair
  • Hisonotus akyClose-up of male
  • Hisonotus akyClose-up of female
  • Hisonotus akyOne month old fry
  • Hisonotus akyOne day old eggs
  • Hisonotus akyTwo day old eggs
  • Hisonotus akyThree day old eggs
  • Hisonotus akyFour day old eggs
  • Hisonotus akyNewly hatched fry
Hop to next section All Fishes Data Sheet
Scientific Name Hisonotus aky    (Azpelicueta, Casciotta, Almirón & Koerber, 2004)
Common Names Green Oto
Green Hisonotus, Grøn Dværgsugemalle (Denmark)
Type Locality Arroyo Garibaldi, 26°38'46.1"S, 53°59'55"W, Río Uruguay basin at Misiones, Argentina.
Synonym(s) Epactionotus aky
Pronunciation hi sow note uss
Etymology (Greek)Isos=equal + (Greek)noton=back. 
Hop to next section Species Information
Size 45mm or 1.8" SL. Find near, nearer or same sized spp.
Identification Easily identified by the striking green colouration.
Sexing Males have more spotted pattern, less green and longer fins (especially the tail fin). Also slimmer from above. Females very green and vent is shorter and blunt.
Hop to next section Habitat Information
Distribution South America: endemic to Argentina.
La Plata, Uruguay (click on these areas to find other species found there)

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IUCN Red List Category
Least Concern
, range map and more is available on the IUCN species page. Last assessed 2020.
Hop to next section Husbandry Information
Feeding In captivity will eat algae disks, soft leaves of certain stem plants (i.e. Hygrophila polysperma) and shrimp pellets can be offered sparingly. User data.
Breeding Has been bred in the aquarium.
Breeding Reports There is no breeding report.
Hop to next section Further Information
Reference Verhandlungen der Gesellschaft für Ichthyologie v. 4 (2004), pp 82, Figs. 1-6.
Registered Keepers There is no registered keeper.
Wishlists Love this species? Click the heart to add it to your wish list.
There is no wish to keep this species.
Spotters Spotted this species somewhere? Click the binoculars!
There are 3 records of this fish being seen, view them all.
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Last Update 2025 Jan 01 12:09 (species record created: 2005 Jan 23 00:00)