Brooklynella hostilis

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Brooklynella hostilis
Scientific classification
Domain: Eukarya
(unranked): SAR
(unranked): Alveolata
Phylum: Ciliophora
Class: Phyllopharyngea
Order: Dysteriida
Family: Hartmannulidae
Genus: Brooklynella
Species: B. hostilis
Binomial name
Brooklynella hostilis
Lom & Nigrelli, 1970

Brooklynella hostilis is a parasite of marine fish, found in wild fish, farmed fish and aquariums.[1] In marine aquariums, it is most commonly found in clownfish.[2] It feeds on dead skin cells and can cause severe damage to gills.[3]

B. hostilis is kidney-bean shaped, and approximately 60–80 μm long,[1] with bands of cilia.[4]

The parasite spreads rapidly, and can easily transfer to a new host increasing the probability of cross contamination.[5]

Affected fish have a gray discoloration, and may breath abnormally fast or abnormally slow.[4] It can cause sloughing of skin, and congestion of the gills.[6]

Formalin is an effective treatment.[4]


  1. ^ a b Calado, R; Olivotto, I; Planas Oliver, M; Holt, JG, eds. (2017). "Chapter 19.2.4: Brooklynella hostilis". Marine Ornamental Species Aquaculture. John Wiley & Sons. ISBN 9781119307013. 
  2. ^
  3. ^ Roberts, RJ (2012). Fish Pathology (4th ed.). John Wiley & Sons. p. 310. ISBN 9781118222966. 
  4. ^ a b c Mitchell, M; Tully, TN, Jr. (2015). Current Therapy in Exotic Pet Practice. Elsevier Health Sciences. p. 26. ISBN 9780323243551. 
  5. ^
  6. ^ Colorni, A; Diamant, A (2014). Woo, PTK; Bruno Gregory, DW, eds. Diseases and disorders of finfish in cage culture (2nd ed.). CAB books. p. 166. ISBN 9781780642079.