Brooklynella hostilis

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Brooklynella hostilis
Scientific classification
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] It is kidney-bean shaped, and approximately 60–80 μm long,[1] with bands of cilia.[2] B. hostilis is the only species in the monotypic taxon Brooklynella, a genus in the order Hartmannulidae.[3] It reproduces by binary fission.[4]

B. hostilis causes the disease Brooklynellosis, also known as slime-blotch or clownfish disease.[4] In marine aquariums, B. hostilis infects most teleosts (ray finned fishes).[3] B. hostilis feeds on dead skin cells and can cause severe damage to gills.[5] Affected fish have a gray discoloration, and may breath abnormally fast or abnormally slow.[2] The infection can cause sloughing of skin, and congestion of the gills.[6] The parasite spreads rapidly, and can easily transfer to a new host.[7] Formalin is an effective treatment.[2]


  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. ^ a b c Mitchell, M; Tully, TN, Jr. (2015). Current Therapy in Exotic Pet Practice. Elsevier Health Sciences. p. 26. ISBN 9780323243551.
  3. ^ a b Basson, Linda; Van As, Jo (2006). "Trichodinidae and other Ciliophorans (phylum Chiliophora)". In Woo, P.T.K. (ed.). Fish Diseases and Disorders (2nd ed.). CABI Publishing Series. p. 168. ISBN 978-0-85199-015-6.
  4. ^ a b McLean, Ewen; Salze, Guillaume; Craig, Steven R. (31 March 2008). "Parasites, diseases and deformities of Cobia". Croatian Journal of Fisheries: Ribarstvo. 66 (1): 1–16. ISSN 1330-061X.
  5. ^ Roberts, RJ (2012). Fish Pathology (4th ed.). John Wiley & Sons. p. 310. ISBN 9781118222966.
  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.
  7. ^