Saskatchewan Fish Lovers

• Formalin
  • 37% composition; 1 cc/ gallon; 15-30 minutes (make sure to observe fish for signs of distress and remove if necessary); add an air stone or some form of mechanical aeration – Bob Fenner
  • Toxic, carcinogenic, and irritant; can be used as effective treatment but dangerous to delicate fish (www.ultimatereef.com – see more detailed paragraph below)

“Cheap, cheerful and effective: sounds perfect, so what’s the catch? Well it’s toxic, carcinogenic and an irritant. It is, however, one of the best treatments for Brooklynella hostilis and Uronema marinum. It can be purchased readily from your chemist and some off-the-shelf cures contain it or a related chemical (paraformaldehyde or gluteraldehyde) so a read of the labels or data sheets of some products is essential if you want to use it. The best way to use this chemical for Brooklynella hostilis and Uronema marinum is as a formalin dip followed by a long term formalin bath (see environmental treatments). To use it as a short dip in seawater, make up a bath in seawater at 200 to 250ppm for 1 hour. The dip component of this treatment regime should be carried out on days 1, 2, 3, 5, 7 & 11 after each dip the fish should be returned to a quarantine tank to which formalin has been added (see below). For the long term long term bath component of this treatment, add 25ppm of formalin to your quarantine tank (it’s toxic to some invertebrates and algae, including most coralline algae species, so cannot be used in a reef situation after 10 days. Remember liquid formalin (which is how you will get it from the chemists) is 37 to 40% formaldehyde and you want 25ppm so you need to add 0.0625ml formalin per litre rather than 0.02ml to get the correct dose.”

• Acriflavin

a. (www.ultimatereef.com -see detailed paragraph below)
“In my opinion, Acriflavin is one of the most under-used treatments available to marine fish keepers. It has a broad range of effect, being effective against protozoans, bacterial infections and external fungal diseases. It is as “reef safe” as any other “reef safe” treatment and is easily obtained. It can be bought in several formulations from the LFS but make sure it isn’t combined with malachite green or methylene blue which have toxicity issues in marine systems. It is effective at a concentration of 6 ppm against many ciliates (Paperna, 1984) and this dose should be added to the aquarium on days 1, 2, 3, 5, 7, & 11. Your skimmer should be turned off and any activated charcoal removed. It dyes the water a greenish yellow colour which will change the light spectrum reaching your corals (if you decide to use it in a reef tank - personally I believe all medications are best kept out of a reef aquarium and used in a quarantine tank) and this colour is a bit of a pig to get rid of, but after treatment turning your skimmer back on and adding activated charcoal helps remove the coloration (as do water changes)”.

• Freshwater dip

a. Parasites fall off fish quickly; recommended about 3-5 minutes; do not place in original tank because fish will become re-infected; make sure freshwater is temperature and pH adjusted to reduce stress; do not use this method for fish whose skin barrier is very damaged because osmoregulation is difficult (www.ultimatereef.com)

• Hyposalinity
  • Although this method is not a cure, it will help to reduce stress and increase chance for fish survival. Slightly lowering the salinity (having less salt in the surrounding water) will decrease the rate at which salts want to flow into the fish and water wants to flow out. Since the osmoregulatory cells of Brooklynella infected fish are probably damaged, hyposalinity may decrease physiological stress. (http://www.advancedaquarist.com/2007/6/fish#h5)
• Metronidazole
  • Oral medication added to diet; prescription (full-strength obtained from veterinarian); 34 mg/kg; reef safe, but will kill anaerobic bacteria (www.ultimatereef.com)
• Quarantine
  • Regardless of treatment method, establishing a quarantine tank is crucial. Quarantining fish is vital to prevent spread of Brooklynella to other fish, and also to help minimize stress among those already infected.
• Antibacterial Agent
  • Use of some kind of antibacterial agent to prevent secondary infections (www.fishvet.com)

Preventing Brooklynella hostilis infection is actually easy, because it is found in wild-caught clownfish and other marine species. One could be much more confident that they are purchasing a Brooklynella free fish if the animal has been tank raised. Clownfish are now commonly seen in the tank-raised variety, and prices compared to wild-caught are similar enough to justify almost eliminating the threat of Brooklynella. Still, there is always a small chance that infection can be introduced into one’s beautiful home aquarium. Therefore, one should always quarantine a newly purchased fish for a couple of weeks, feed it immunostimulants, and observe it for any abnormal behavior. With proper prevention, one will hopefully never face the hassle and destruction caused by Brooklynella hostilis.

Sources:
www.wetwebmedia.com/brooklynellosisart.htm
www.ultimatereef.com
http://www.advancedaquarist.com/2007/6/fish#h5
http://www.wonbrothers.com/product/DrAqua/parasitic_diseases.htm
www.fishvet.com