Dryden Aqua Ltd Butlerfield | Bonnyrigg | Edinburgh EH19 3JQ | Scotland Treatment of marine hatchery water to eliminate NoroVirus Parameters location Eastern Mediterranean Fish species Sea Bass Water flow 150m3/hr salinity 35ppt temperature 25 deg c turbidity 0.1 to 1 ntu The problem Marine fish hatcheries are susceptible to the introduction parasites, bacterium and viri and can impact on the profitability and viability of a fish farm installation. The most sensitive stages include egg incubation, first feeding and early rearing, until grow-out stage, however all stages are at risk. The virulence of Norovirus is but one example of an endemic risk associate with a viral pathogen. Parasites can be removed by good filtration down to 5 microns, bacteria can usual

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