AquaticRepublic.com - Hassar orestis (Doradidae) All Fishes

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All Fishes Data Sheet
Scientific Name	**Hassar orestis** (Steindachner, 1875)
Common Names	Black Top Mouse Catfish Zwergdornwels (Germany)
Type Locality	Rio Iça, upper Amazon River, Brazil.
Synonym(s)	Hassar notospilus, Hassar ucayalensis, Hemidoras notospilus, Oxydoras orestis
Pronunciation	ha sar - oh res tiss
Etymology	Hassar: From the Aruac name of the fish.
Species Information
Size	206mm or 8.1" SL. Find near, nearer or same sized spp.
Identification	The black top mouse catfish is very similar to another mouse catfish, Tenellus leporhinus, the main visual difference being the latter's clear dorsal fin with a black marking at its base. Aside from that T. leporhinus has longer leading fin rays.
Sexing	Similar to Corydoras in that females are larger and rounder than the more slender and smaller males. Male has a longer dorsal ray and the female has rounded pelvic fins.
Habitat Information
Distribution	South America: Amazon, Orinoco and Essequibo River basins. Guyana Waters, Coastal Rivers of Guyanas, Essequibo (click on these areas to find other species found there) Amazon (click on these areas to find other species found there) Orinoco (click on these areas to find other species found there) Login to view the map.
IUCN Red List Category	Least Concern , range map and more is available on the IUCN species page. Last assessed 2020.
pH	6.0 - 7.6
Temperature	22.0-25.0°C or 71.6-77°F (Show species within this range)
Husbandry Information
Feeding	Until acclimatized, the fish appears quite selective and like small foods. Crushed flake or sinking flake-based tablets best for smaller individuals although brineshrimp is taken by species around the 2'' mark. Larger, more settled fish are easier to feed and become very active during feeding. User data.
Furniture	Dense vegetation empowers this fish with a much needed sense of confidence in it's surroundings. Caves or dark refuges appear less important.
Compatibility	Non aggressive and, as with all Doradids, sociable with its own species. Smaller fish appear to have an innate fear of larger fish and becomes very shy in their presence.
Suggested Tankmates	Smaller shoaling tetras and Corydoras are ideal. Dwarf cichlids and smaller labyrinth fish (Gouramis etc) are also suitably gentile. Larger, acclimatized fish will do well in a medium to large community set-up. At any size, best kepts in shoals to ensure greater boldness and health.
Breeding	Unreported in the aquarium.
Breeding Reports	There is no breeding report.
Further Information
Reference	Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Classe v. 71 (no. 1), pp 138 [1], Pl. 1.
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 2 records of this fish being seen, view them all.
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	Look up H. orestis on PlanetCatfish.com
	Look up H. orestis on Fishbase
	Look up H. orestis on Encyclopedia of Life
	Look up H. orestis on Global Biodiversity Information Facility
	LFS label creator ARN ref:1.12.25.39
Last Update	2025 Jan 01 11:59 (species record created: 2001 Apr 21 00:00)