Poecilocharax weitzmani
{{Short description|Species of ray-finned fish}}
{{Speciesbox
| image = Crenuchidae Poeciliocharax weitzmani.jpg
| status = LC
| status_system = IUCN3.1
| taxon = Poecilocharax weitzmani
| authority = Géry, 1965
}}
Poecilocharax weitzmani, the black morpho tetra or black darter tetra, is a species of characid found in South America.{{Cite web |title=Poecilocharax weitzmani summary page |url=https://fishbase.se/summary/12395 |access-date=2025-02-06 |website=FishBase |language=en}} The fish was first discovered in 1965.{{Cite journal |last=Géry |first=J |date=1965 |title=Poissons characoïdes sud-américains du Senckenberg Muséum, II. Characidae et Crenuchidae de l'Igarapé Préto (Haute Amazonie) |journal=Senckenbergiana Biologica |volume=46 |issue=3 |pages=195-218}}
Description and behavior
The black morpho tetra is a small finned fish. The fish typically reaches {{Convert|40|-|50|mm|abbr=on}} in length, although they have been recorded growing as large as {{Convert|4|cm|abbr=on}}.{{Cite web |title=Poecilocharax weitzmani (Black Darter Tetra) — Seriously Fish |url=https://www.seriouslyfish.com/species/poecilocharax-weitzmani/ |archive-url=http://web.archive.org/web/20231017063242/https://www.seriouslyfish.com/species/poecilocharax-weitzmani/ |archive-date=2023-10-17 |access-date=2025-02-06 |website=www.seriouslyfish.com}} The black morpho tetra demonstrates significant sexual dimorphism, with males growing longer and more colorful dorsal and anal fins.{{Cite web |last=Aquadiction |date=2020-10-14 |title=Black Darter Tetra - Poecilocharax weitzmani Fish Profile & Care Guide |url=https://aquadiction.world/species-spotlight/black-darter-tetra/ |access-date=2025-02-06 |website=Aquadiction |language=en}}
Unlike many other small characids, the black morpho tetra does not form schools. Males have a tendency to show territorial aggression towards one another.