threadfin cichlid

{{Short description|Species of fish}}

{{Speciesbox

| image =

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Bigirimana, C. |date=2006 |title=Petrochromis trewavasae |volume=2006 |page=e.T60651A12391731 |doi=10.2305/IUCN.UK.2006.RLTS.T60651A12391731.en |access-date=16 November 2021}}

| taxon = Petrochromis trewavasae

| authority = Poll, 1948

| synonyms =

• Perissodus trewavasae (Poll, 1948)
• Petrochromis trewavasae trewavasae Poll, 1948

}}

The threadfin cichlid (Petrochromis trewavasae) is a species of cichlid endemic to Lake Tanganyika found in areas with rocky substrates on which it can graze on algae. This species can reach a length of {{convert|18|cm|in|abbr=on}}. It can be found in the aquarium trade.{{FishBase |genus= Petrochromis|species= trewavasae| month = April | year = 2013}} The specific name of this cichlid honours the British ichthyologist Ethelwynn Trewavas (1900-1993).{{cite web | url = http://www.etyfish.org/cichlidae5/ | title = Order CICHLIFORMES: Family CICHLIDAE: Subfamily PSEUDOCRENILABRINAE (p-y) | access-date = 20 February 2019 | author1 = Christopher Scharpf | author2 = Kenneth J. Lazara | name-list-style = amp | work = The ETYFish Project Fish Name Etymology Database | publisher = Christopher Scharpf and Kenneth J. Lazara | date = 25 September 2018}}