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Quarantining New Marine Aquarium Fish

Do I really need to quarantine new marine aquarium fish?

By Jeremy Gosnell |

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Quarantining your new saltwater fish is beneficial to the new and old fish alike
Sixline grouper, clownfish and puffers in a quarantine facility for saltwater fish.
Photo by Oliver Lucanus

Q. Do I really need to quarantine new saltwater fish arrivals to my aquarium? I hear so much jargon about setting up these elaborate quarantine tanks and keeping new fish in them for several weeks before entry into the main aquarium. Are quarantine tanks really necessary or just a waste of time? I have added a lot of new fish that have not been quarantined and only had two parasite outbreaks. Should I set up a quarantine tank for new aquarium fish, or will it just cause more headaches?
Sarah
Wisconsin

A. Most experienced aquarists agree that the practice of quarantining new fish before they are released into the main aquarium is one of the fundamental keys to success, especially where reef aquariums are concerned. While I recommend quarantining both new freshwater and saltwater fish, the practice becomes crucial on the saltwater side of the hobby for several reasons. While quarantine tanks do take some time to set up, they do not have to be elaborate or expensive. In fact, a good and reliable quarantine tank can be set up rather cheaply and doesn’t require much effort once it is established.

Many of the saltwater fish we keep in aquariums come from the ocean. While captive breeding programs are showing promise, many ornamental fish species can only be acquired through wild capture. The problem with this is that saltwater fish caught from the wild already have a minor parasitic infection that is under control by the fish’s natural immune system. Once removed from their environment, shipped across the world and placed in the aquarium setting, the once-dormant parasitic infection, such as marine ich, can reappear full blast. The stress of capture and shipping is often enough to suppress a tropical fish’s immune system and allow any parasite (not to mention those it may have picked up in the dealer’s tank) to gain a strong foothold. Quarantining new tropical fish is essential because while the tropical  fish may appear healthy in the dealer’s tank and even in your own tank for a number of days, that parasitic infection or bacterial infection it harbors can then attack your entire aquarium within weeks.

In the ocean, parasites are kept under control naturally. However, because aquariums are closed systems, they can promote serious parasitic or bacterial outbreaks that wipe out entire tanks full of gorgeous and expensive aquarium fish and other animals. In reef aquariums, treating outbreaks once they appear is difficult, if not impossible, because many chemical and environmental treatments kill sensitive corals and invertebrates. Quarantining new aquarium fish is really the best course of action when looking at parasites and bacterial infections in the saltwater aquarium hobby.

The only time I recommend not quarantining new fish is if your local fish store is willing to do it for you. I know several local fish stores that will quarantine fish for up to two weeks if the tropical fish is paid for in advance. While this is better than no quarantine time at all, I feel two weeks is a short period of time for saltwater fish. When quarantining new tropical fish, I have had the best success when I quarantined the fish for up to two months in a quarantine tank before releasing them into the main aquarium. While this may sound like a dramatically long time, many saltwater parasites have intricate life cycles and can be tough to diagnose and treat quickly.

One thing to keep in mind while quarantining new tropical fish is that it does not only serve to protect your main aquarium’s fish from parasites or treat your new saltwater fish for an existing infection. Quarantining new fish in a quarantine tank also gives a new tropical fish time to relax and adjust to life in aquariums without the added stress of getting used to a new set of tankmates. I often find it much easier to get tough-to-feed fish to eat in quarantine, and I am able to get the tropical fish in better health before I transmit the fish over to the display aquarium. Also, having the tropical fish in confines by itself allows the aquarist to experiment with feeding to learn just what fish foods or combination of foods work best for the individual species.

Overall, quarantining new saltwater fish is one of the fundamental building blocks to success with saltwater aquariums. While they aren’t fun to set up, tanks used for quarantining new tropical fish represent an important tool in the hobby and have been used by many aquarists over the years.

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Reader Comments

Chuck    Euclid, OH

4/7/2008 8:59:52 AM

I fully agree with this article. After dealing with an Ich outbreak, I learned my lesson.

Steve    Port St Lucie, FL

4/4/2008 4:59:06 PM

I feel that 3 weeks in a quarantine tank is sufficient. If the animal is eating and showing no signs of disease then 3 weeks is plenty IMO.

Al    Philly, PA

4/3/2008 6:43:53 PM

Quarrantine is a must. If you don't, you'll find out the hard (and expensive) way

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