Det giver jo næsten sig selv, at det ikke kan få fat på de Cyster der ligger gemt og dem der sidder på fiskene - og så er man jo lige vidt.
Anyway, der står en del her i denne artikel:
http://reefkeeping.com/issues/2003-10/s ... /index.htm" onclick="window.open(this.href);return false;
(Jeg kender godt det link Troels lagde ind. Artiklen fra Reefkeeping er lidt "lettere" at læse, men siger det samme.)
Udraget om UV:
Treatment Option 9: U.V. Sterilization
Ultraviolet sterilizers work by damaging most anything in the water column that passes through them. Their effectiveness is dependent on the wattage of the unit, the flow rate through the unit, the age of the lamp, the volume of the water being treated, the cleanliness of the sleeve, the clarity of the water, and the decorations (potential hiding spots for tomonts) in the aquarium (Moe, 1989). Colorni & Burgess (1997) discuss the use of UV. They extrapolate from a previous study done on freshwater Ich, Ichthyophthirius multifiliis, and UV
(If you are so interested, the original article is Gratzek, Gilbert, Lohr, Shotts, and Brown's 1983 piece "Ultraviolet light control of Ichthyophthirius multifiliis in a closed fish culture recirculation system." It can be found in the Journal of Fish Diseases volume 6 pages 145-153). In the study, they showed UV could prevent the spread of Ichthyophthirius multifiliis when used on a central system, but could not affect a cure within an individual aquarium. Colorni and Burgess believe the same would hold true with Cryptocaryon irritans. I would concur with them as my own personal/professional experience has demonstrated the same. I have found UV's to be very effective in bare bottom tanks, primarily in retail and wholesale operations. In display aquaria, the volume of the tank, the substrate and rockwork, the flow rate of the UV, and the wattage all work against its effectiveness. In commercial operations, many times, employees wipe down bare bottom tanks daily to maintain a clean appearance for customers. This has the added benefit of knocking loose the cyst stage of the parasite. The bare bottom, minimal decoration, high flow rates, and massive UV units on these systems ensure that most all the cysts and theronts pass through the sterilizer and are neutralized.
Please note that while I have drawn a comparison between freshwater and saltwater Ich, there is no taxonomic relationship. They may appear superficially similar to aquarists and they do in fact share some common features such as life cycle, mode of reproduction, and dispersal mechanism, but they are different and distinct organisms. This is a case of convergent evolution; when different organisms evolve to have a similar appearance because they occupy similar niches. There is a very nice example illustrating this phenomenon located at this website.
Der er flere sider fra forskellige universiteter der viser det samme, som det link Troels lagde ind. Jeg har læst, både Troels´s link og de øvrige jeg har kunne støve op og de konkluderer alle det samme.
Det skal dog siges, at de parasitter der kommer forbi, bliver slået ihjel. Men du vil ikke kunne udrydde dem er jeg sikker på - ikke før det har taget livet af fiskene.
Det skal dog siges, at der er flere forskellige slags parasitter og ikke alle er lige slemme.
Jeg har forøvrigt selv et stort kraftigt UV filter fra Water.dk, som jeg aldrig bruger af samme årsag. Jeg hælder til karantæne.
Erik