Читать книгу Clinical Guide to Fish Medicine - Группа авторов - Страница 126

UV light in the 254 nm range irradiates pathogens and proteinaceous material, physically destroying them. It requires adequate bulb output (measured in mJ/cm² or mWs/cm²) and an appropriate contact time and flow rate (Figure A3.14). This technique is most effective when used in flow‐through systems, with irradiation of the incoming water. It is less effective in closed and semi‐closed systems, since the effect is localized and may not control the microbial density nearest the animal. The efficiency of UV varies and it should be continuously monitored. Target organism kill rates can be established based on contact time and flow rate. UV quality deteriorates over time and tubes need to be changed regularly (e.g. at least every six months). The quartz sleeves around the bulbs may need to be wiped down as frequently as daily or weekly to reduce biofouling.