Piratfisk med mørk plet.

En af mine piratfisk har fået en lille mørk plet og en stor mørkplet med en blå kant rundt om, den spiser, og svømmer sammen med de andre, som normalt. Den ser ikke svækket ud eller noget som helst? og jeg har lige skiftet 50% af vandet i akvariet, jeg opdagede pletterne i morges, og skiftede vandet hurtigt. Hvad skal jeg gøre?

Mvh.
jonasl

Er den på størrelse med et knappenålshovede?

Så kunne det være en parasit, kan åbenbart behandles med produkter der indeholder formalin:

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Witten by Stan & Debbie Hauter

Identification, Cause & Treatment
What is Black Spot Disease?



Also referred to as Black Ich, this saltwater fish disease is caused by a small parasitic turbellarian flatworm in the genus Paravortex that takes up residence in the aquarium substrate. The adult worm attaches to a host for about six days, falls off into the substrate, then in about five days the adult body ruptures releasing a new population of young worms and the cycle begins again. It normally does not show up in the larger numbers as with other forms of Ich (Whitespot Disease and Coral Fish Disease) and is not nearly as dangerous. It is a disease that is fairly common with Yellow Tangs and Angelfishes, but can effect other fish species as well.

Symptoms Black Spot Disease appears on the fins and body of fish as tiny black dots, less than the size of a pinhead.

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The fish will scratch up against objects in the aquarium and the disease may be associated with reddened skin, lethargy, color loss and rapid breathing. It is easily seen on light colored fish, but is less obvious and sometimes overlooked on dark colored fish.



Cause

Because this is a parasitic worm that occurs in nature, it just happens. It is most likely carried in unseen on a newly introduced fish. Some of the contributing factors that make fish susceptible to this parasite are stress, illness (a weakened system makes fish prone to all types of disease) and poor aquarium substrate maintenance.

During the 10 years we spent collecting Hawaiian fishes we occasionally had occurrences of this disease. It seemed to mostly effect Yellow Tangs placed in our hospital tank that did not handle the stresses of collecting well, such as ones that did not decompress properly or were poked or injured by other fish, but it would also effect some of the other fish in the tank. The hospital tank had a coral rubble gravel substrate and a UGF (undergravel filter) in it. Once in a blue moon it would pop up on healthy Yellows Tangs in other aquariums that had substrate and UGF's, but we cannot recall over 10 years any outbreak in our large 3,000 gallon bare bottom vat system that had a wet/dry trickle and pre-filter floss set up. This correlates with the fact that this parasitic worm is a substrate dweller.

Treatments

Some aquarists say copper based treatments do not work and some recommend them as effective (third disease listed). From our point of view we cannot contribute a definitive conclusion to these opinions. Because of the large number of new fishes introduced into our system on a daily basis and that we used natural sea water, we always maintained a minimum effective copper treatment level (.15 ppm) in all of our holding tanks for disease prevention. It was only at times when we allowed the effective copper level to drop below the minimum that it would open the door to a Whitespot (Crytocaryon) or Coral Fish Disease (Oodinium) outbreak. However, we cannot say for sure that the occasional appearance of Black Ich did or did not correlate with this factor.

Using formalin treatments, trichlorofon based solutions or adding natural biological cleaners are also suggested by aquarists. We have little or no experience with these chemical treatments, except to say that having experimented with formalin dips several times after we began our fish business, we choose never to use it again. This is a very toxic chemical and unless it is used properly in the correct proportions, it can result in adverse side effects and even death of the animals being treated. Nowdays there are premixed medications that contain formalin in them. If you choose to use these types of medications we suggest you consult with your fish store about them. As far as using biological cleaners, we do have experience with theHawaiian Cleaner Wrasse. Even though this fish is a good natural cleaner, our opinion is that it should not be kept in captivity. Once the parasitic food source is gone they usually starve and die.

When dealing with Black Ich we used freshwater. Freshwater bath treatments are safe, non-toxic and very effective. During the first treatment of a freshwater bath you can literally see the majority of the parasites loose their color, drop off the fish and disappear. Before performing any of the following freshwater bath procedures, please be sure to read our important tips first!

Freshwater Bath Tips & Procedures For prevention try to keep organic build up in the substrate under control, remove any visible accumulated detritus in the aquarium as often as needed, and always place new fish in a QT for a couple of weeks of observation time before placing them into your main aquarium. A quick 1-2 minute freshwater dip before putting fish in a QT doesn't hurt either, as long as there are no signs of stress.

nej pletten er forholdvis stor..

Mvh.
jonasl

kunne ligne et blåt mærke efter bid fra en anden pirafisk .. men jeg ved ikke om blå mørker forekommer hos fisk


Mvh.
jonasl