Diflubenzuron as an Effective Treatment of Caligoid Copepods in a 20,800 m3 Seawater Mixed-Species Exhibit with Manta sp.
IAAAM 2015
Alfonso Lopez; Komsin Sahatrakul*; Christopher Torno; Hazel Tan; Andrew Clarke
Animal Health & Research, S.E.A. Aquarium, Marine Life Park, Resorts World Sentosa, Singapore

Abstract

Open Ocean Habitat (OOH) is the biggest exhibit in S.E.A. Aquarium, Resorts World Sentosa (RWS) in Singapore. Its total volume is 20,800 m3 of tropical seawater. The system is a biological marine water system with mechanical filtration, ozone disinfection and water temperature of 26–27°C. This mixed-species exhibit housed approximately 40,000 tropical fish and elasmobranches [e.g., Manta rays (Manta sp.), spotted eagle rays (Aetobatus narinari), shark rays (Rhina ancylostoma), zebra sharks (Stegostoma fasciatum), black-blotched stingrays (Taeniura meyeni), etc.].

In August 2013, it was reported that all three manta rays were developing multiple diffused white patches on the skin and cephalic lobes. Subsequently, one manta ray was caught for physical examination. During examination, skin scrapes, blood and morphometric were performed. All initial indications and cytological descriptions pointed to Caligoid copepods infestation as a cause of the lesions.1,2

Considering the size and composition of OOH habitat, diflubenzuron (Dimilin®) was considered as an effective and safe treatment at 0.02 mg/L through bio-testing at our quarantine facility with different species of elasmobranches and as described in reviewed literature.1,3,4 The target exposure time was calculated for a minimum of 8 hours, and the regime was as follows: at 0830 hours, Ozone, FF venturi pump turned off during treatment and turned on all components at 1630 hours, making an eight hours prolonged immersion treatment. Food was reduced 25% during treatment day. The drug was re-dosed after 40 hours after finishing the last dosing for a total of 10 treatments (3 weeks). No parasites were observed after complete treatment. No adverse effects on water-quality parameters. In addition, water samples were collected pre-treatment, during treatment and post-treatment and submitted for organophosphate analysis at Agri-Food & Veterinary Authority (AVA), Singapore, to measure the levels of diflubenzuron residual concentration.

Acknowledgements

The authors wish to thank Dr. Tonya Clauss of Georgia Aquarium and Tim Graham of Aqua Design and Management for their assistance in this case. The authors thank the staffs of Animal Health & Research and Life support system team of S.E.A. Aquarium at Resorts World Sentosa.

* Presenting author

Literature Cited

1.  Benz GW, Bullard SA. Metazoan parasites and associates of chondrichthyans with emphasis on taxa harmful to captive hosts. In: Smith M, Warmolts D, Thoney D, Hueter R, eds. The Elasmobranch Husbandry Manual: Captive Care of Sharks, Rays and their Relatives. Ohio Biological Survey; 2004:325–415.

2.  Boxshall G. Copepoda (copepods). In: Rohde K, ed. Marine Parasitology. CSIRO Melbourne and CABI Wallingford; 2005:123–138.

3.  Hadfield CA, Jones TG, Clayton LA. Successful treatment of fish lice (Argulus sp.) in a 30,000-gallon mixed-species exhibit. In: Proceedings of the International Association for Aquatic Animal Medicine 43th Annual Conference, Atlanta, GA; 2012:20–21.

4.  Noga EJ. Copepod infestation/infection. In: Noga EJ. Fish Disease: Diagnosis and Treatment. St. Louis, MO: Mosby; 1996:79–85.

  

Speaker Information
(click the speaker's name to view other papers and abstracts submitted by this speaker)

Komsin Sahatrakul
Animal Health & Research
S.E.A. Aquarium, Marine Life Park
Resorts World Sentosa, Singapore


MAIN : Fish Health & Medicine : Diflubenzuron & Caligoid Copepods
Powered By VIN

Friendly Reminder to Our Colleagues: Use of VIN content is limited to personal reference by VIN members. No portion of any VIN content may be copied or distributed without the expressed written permission of VIN.

Clinicians are reminded that you are ultimately responsible for the care of your patients. Any content that concerns treatment of your cases should be deemed recommendations by colleagues for you to consider in your case management decisions. Dosages should be confirmed prior to dispensing medications unfamiliar to you. To better understand the origins and logic behind these policies, and to discuss them with your colleagues, click here.

Images posted by VIN community members and displayed via VIN should not be considered of diagnostic quality and the ultimate interpretation of the images lies with the attending clinician. Suggestions, discussions and interpretation related to posted images are only that -- suggestions and recommendations which may be based upon less than diagnostic quality information.

CONTACT US

777 W. Covell Blvd., Davis, CA 95616

mailto:vingram@vin.com

PHONE

  • Toll Free: 800-700-4636
  • From UK: 01-45-222-6154
  • From anywhere: (1)-530-756-4881
  • From Australia: 02-6145-2357
SAID=27