Veterinary Research Forum
Vet Res Forum

Achlya infection in an Oscar (Astronotus ocellatus) with typical symptoms of saprolegniosis

Document Type : Clinical Report

Authors

Rahim Peyghan 1
Roya Rahnama 2
Zahra Tulaby Dezfuly 3
Maryam Shokoohmand 4

1 Department of Clinical Sciences, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran

2 Graduated student of Aquatic Animal Health, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran

3 Ph.D Student of Aquatic Animal Health, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran

4 Ph.D student of Aquatic Animal Health, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran

https://doi.org/10.30466/vrf.2019.34315
Abstract
Saprolegniosis is one of the most frequent diseases in the ornamental fish industry that may cause by Achlya spp. There is no report of fungal infection caused by Achlya spp. in Oscar (Astronotus ocellatus) in Iran. An Oscar fish was referred to the Veterinary Hospital, Shahid Chamran University of Ahvaz, Ahvaz, Iran with saprolegniosis symptoms including loss of appetite and yellow to gray cottony mass on the skinof flank and caudal peduncle. The infected area of the fish body was investigated by wet smear. After observing broad aseptate hyphae (approximate width 10-15 μm), the infected skin was inoculated on Sabouraud dextrose agar and incubated at 30 ˚C for seven days. The large fungi colony was appeared on the agar and the isolated fungi were detected as Achlya spp. after examination by wet and stained dry smears according to the morphology of hypha, spores, and zoosporangium. It is the first report of cutaneous saprolegniosis in Oscar caused by Achlya spp. in Iran.

Keywords

Achlya sp
Fungus
Ornamental fish
Oscar
Subjects

  1.  

    1. Roberts RJ. Fish pathology. 4th ed. London, UK: Wiley-Blackwell 2012; 383-395.
    2. Haroon F, Iqbal Z, Pervaiz K, et al. Incidence of fungal infection of freshwater ornamental fish in Pakistan. Int J Agri Biol 2014; 16 (2): 411-416.
    3. Sosa ER, Landsberg JH, Kiryu Y, et al. Pathogenicity studies with the fungi Aphanomyces invadans, Achlya bisexualis, and Phialemonium dimorphosporum: induction of skin ulcers in striped mullet. J Aquat Anim Health 2007; 19 (1): 41-48.
    4. Chauhan R, Lone S, Tabbsum HG. Mycotic studies of some freshwater fishes with emphasis on Achlya spp. Int J Fish Aquac 2013; 3(4): 165-169.
    5. Shahbazian N, Ebrahimzadeh Mousavi HA, Soltani M, et al. Fungal contamination in rainbow trout eggs in Kermanshah province propagations with emphasis on Saprolegniaceae. Iran J Fish Sci 2010; 9 (1):151-160.
    6. Fadaeifard F, Bahrami H, Rahimi E, et al. Freshwater fungi isolated from eggs and broodstocks with an emphasis on Saprolegnia in rainbow trout farms in the west of Iran. Afr J Microbiol Res 2011; 4 (22): 3647-3651.
    7. Chauhan R, Kaur P, Sharma S. Pathogenicity of some species of Achlya and Saprolegnia on Indian Major carps viz. Catla catla, Cirrihinus mrigala and Labeo rohita. J Environ Sci Comp Sci Eng Technol 2012; 1 (3): 422-428.
    8. Froese R, Pauly D. Astronotus ocellatus, Oscar. US Fish and Wildlife Service. Available at: https://www.fws. gov.  Accessed July 20, 2018.
    9. Iqbal Z, Noreen H. Fungal infection in an imported ornamental fish Fantail, (Carassius auratus L.). Biologia 2015; 61 (1): 69-73.
    10. Buller NB. Bacteria and fungi from fish and other aquatic animals: A practical identification manual.
      2nd ed. Boston, USA: CABI 2014; 664- 670.
    11. Holgerson MA, Post DM, Skelly DK. Reconciling the role of terrestrial leaves in pond food webs: A whole-ecosystem experiment. Ecology 2016; 97 (7): 1771-1782.
    12. Kitancharoen N, Hatai K, Ogihara R, et al. A new record of Achlya klebsiana from snakehead, Channa striatus, with fungal infection in Myanmar. Mycoscience 1995; 36(2): 235-238.
    13. Saraswathi R, Sumithra P, Sivakami R. Studies on the effect of Achlya species in various fish species cultured in different freshwater systems of Pudukkottai District, Tamilnadu, India. Int J Curr Microbiol Appl Sci 2015; 4(12), 670-674.
Veterinary Research Forum
Volume 10, Issue 1
Winter 2019
Pages 89-92

  • Receive Date 12 February 2019

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